PREFACE

Although it is still a crude machine—in view of the perfected apparatus

which is the aim of thoughtful designers—the aeroplane has demonstrated,

in a conclusive way, its value as an instrument of war.

In peace manœuvres in France and Germany, and under actual war

conditions in Tripoli, scouting machines have proved their ability to

pierce most effectually what is known as "the fog of war." Air-scouts

have, indeed, revealed the dispositions of an enemy so precisely as to

make it necessary to alter—at a moment’s notice—an entire plan of

campaign.

Ceasing to be fair-weather craft, powerful, modern-type aeroplanes can

combat high and gusty winds, and are already capable of being used, for

reconnoitring flights, on at least 80 per cent of the days of the year.

No longer unreliable, they have become practical weapons.

A squadron of war aeroplanes, carrying pilots and observers, can, as has

been shown again and again, lay bare the disposition of a widespread

battle-front. In one hour, they can perform the reconnoitring work which

has hitherto been carried out in a day, and in a necessarily hit-or-miss

fashion, by cavalry and other scouts.

The use of well-trained corps of military airmen will revolutionise the

tactics of war. No longer will two Commanders-in-Chief grope in the

dark. They will sit, so to speak, on either side of a chess-board, which

will represent the battlefield. Each will watch the other’s moves;

nothing will be concealed. From a blundering, scrambling moving about of

masses of men, modern warfare will become—through the advent of the

aeroplane—an intellectual process.

The Commander-in-Chief who has no proper air-corps, in the next great

war, will be in a hopeless position. He will have lost a battle

practically before it begins. Whereas his opponent will know exactly

what _he_ is doing, he will be able to obtain nothing but vague and

confusing tidings as to the movements of the enemy. Imagine two armed

men approaching each other, one being blindfolded. The

Commander-in-Chief without aeroplanes will be like a blindfolded man.

One nation stands head-and-shoulders above all others in the matter of

her aerial equipment and experience. That nation is France. So far ahead

is she that it will be a long time before other countries will be able

to come up with her; but Germany is now making desperate efforts to do

so.

Until recently, it must be said, England lagged inactively not only

behind France and Germany, in the organising of an air-corps, but even

behind such countries as Austria, Italy, and Spain.

Now, however, there are promises of a change. For this, mainly, we must

thank the energy and enthusiasm of Colonel Seely, Parliamentary Under

Secretary of State for War. When these lines are being read, British

aeroplane manufacturers will be preparing for an important military

trial of aeroplanes, which is to be held in England during the summer.

The War Office has begun to buy aeroplanes, although on a small scale.

We now have a Royal Flying Corps; a body of skilled airmen is being

trained. But money is spent very sparingly. Our equipment, compared with

that of France, is still a negligible quantity. In machines, and men,

and, above all, in training, we are very far behind.

Only by persistent and intelligently directed work, by the spending of

more money, by the practical encouragement of manufacturers, and by the

appointing of executive officers who are experts in their field of work,

can we hope even to approach the organisation of the air-corps of

France.

But a beginning has certainly been made. By the end of the forthcoming

flying season, we should have in England a small, but well-equipped air

service. And the work of this corps will be its own advertisement. Once

the potentialities of the war aeroplane are realised adequately, a

stinting policy will be impossible.

It is our aim, in this book, to show what the war aeroplane has done,

and can do. At present, its work has been confined to scouting. But it

has other, and grimmer possibilities. It can, and without doubt will, be

used as an engine of destruction—not by means of the bomb-dropping

attacks of a few aeroplanes, but by the organised onslaught of large

squadrons of weight-lifting machines, which will be able to rain down

tons of missiles over any given spot.

And there is another possibility, also. Machines are carrying heavier

loads every day. Soon the practicability of aeroplanes to transport

troops—particularly in regard to hurrying up reinforcements in an

emergency—will be demonstrated.

When two opposing armies both have large fleets of war aeroplanes, and

these machines take the air in squadrons, prior to a battle, what will

happen when they come in contact with each other?

The question is one which the greatest military experts are discussing.

Obviously, there will be an aerial battle, each aeroplane corps seeking

to cripple the other. Each Commander-in-Chief will in fact desire, above

all else, to obtain supremacy of the air. If he can do so, it will have

the effect of seriously handicapping his opponent.

Thus—probably waged with light guns firing explosive shells—the next

great war will begin, not on earth, but several thousand feet in the

air.

Claude Grahame-White.

Harry Harper.

London, 1912.

*CONTENTS*

PREFACE ...........................................................

FIRST SECTION REVIEW OF PROGRESS PRIOR TO THE FIRST MILITARY TESTS

OF AEROPLANES .....................................................

I. Dawn of flight—Encouragement in Europe and America—England’s

lost opportunities—The pioneers. ................................

II. First practical flights—The Wright brothers; the Voisins;

Farman—The cross-Channel flight. ................................

III. Aeroplanes at Rheims, 1909—Wright, Voisin, Farman, Blériot,

Antoinette—The Gnome engine—First military orders. ..............

IV. The human factor—Growing skill of airmen—Feats of 1910, as

compared with those of 1909—Cross-country flying. ...............

SECOND SECTION FIRST EXPERIMENTS WITH AEROPLANES IN THE FRENCH

AUTUMN MANOEUVRES, 1910. ..........................................

I. The historic Picardy tests—First official report upon movements

of troops, as gleaned by aeroplane. .............................

II. Second conclusive test—Detecting an army in retreat—France’s

determination to possess an air-fleet. ..........................

THIRD SECTION THE GROWING AIR-FLEETS OF FOREIGN NATIONS ...........

I. Activity in France—Two hundred machines at the end of 1911; a

thousand promised by the year 1914. .............................

II. The great French tests of military aeroplanes—Striking results

obtained—Era of fast, "air-worthy," weight-carrying machines. ...

III. Germany’s aerial policy—Secret energies in creating a fleet

of war aeroplanes—Rivalry with France. ..........................

IV. Progress in Russia, America, and other countries-England’s

position in the autumn of 1911. .................................

FOURTH SECTION IMPORTANCE OF ORGANISATION IN THE USE OF WAR

AEROPLANES ........................................................

I. French plans for the concerted use of squadrons of machines in

time of war. ....................................................

II. Value of air-stations—Selection of landing-grounds—Preparing

air-maps. .......................................................

FIFTH SECTION ENGLAND’S POSITION IN REGARDS TO MILITARY FLYING ....

I. Lessons which were ignored—Work of the Parliamentary Aerial

Defence Committee. ..............................................

II. Policy of "moving cautiously"—Peril of lagging behind in

aerial armament. ................................................

III. The financial aspect—Money England is spending—The airship

policy—Insufficient provision for aeroplanes. ...................

IV. Dangers of a policy of "drift"—Experience which money cannot

buy—Trained men, not so much as machines, the criterion of

strength. .......................................................

V. England’s official awakening—The training of 100 airmen—The

forthcoming trials of military machines. ........................

SIXTH SECTION WAR AEROPLANES AT THE PARIS AERONAUTICAL EXHIBITION,

DECEMBER, 1911 ....................................................

I. Latest-type military monoplanes—Two-seated, reconnoitring

machines—Single-seated, high-speed aircraft. ....................

II. Latest developments in biplane construction—The

engine-in-front, weight-carrying machine. .......................

III. Healthy position of the French industry—What England has

lacked—Danger of neglecting home builders. ......................

SEVENTH SECTION WHAT EXISTING WAR AEROPLANES CAN ACTUALLY ACCOMPLISH

I. Plight of a Commander-in-Chief without an aeroplane corps—The

work of cavalry reconnaissance. .................................

II. Work of a squadron of air-scouts described—Tasks of the pilot

and observer—Combined reconnaissance by many machines—Effect of

aeroplanes upon tactics. ........................................

III. Other uses of the war

aeroplane—Surveying—Dispatch-carrying—Directing gun-fire—Transport

of staff officers. ..............................................

EIGHTH SECTION WIRELESS TELEGRAPHY AND PHOTOGRAPHY AS AIDS TO AERIAL

RECONNAISSANCE ....................................................

I. First tests and successes with wireless telegraphy—Difficulty

of equipping an aeroplane with transmitting plant. ..............

II. French triumphs with wireless telegraphy—Messages sent over a

distance of thirty-five miles. ..................................

III. Practical uses of wireless upon aeroplanes—England’s lack of

effort. .........................................................

IV. Photography from a war aeroplane—The use of special automatic

cameras. ........................................................

NINTH SECTION DEVELOPMENT OF ALL-WEATHER WAR AEROPLANES ...........

I. Flights in thirty-five-mile-an-hour winds—Arguments of

sceptics—What the great contests of 1911 proved. ................

II. Value of high speed, when combating a wind—Constructional

difficulties of a hundred-mile-an-hour machine. .................

III. Variable-speed aeroplane—Plans for constructing aircraft of

this type—Advantages of such a machine. .........................

IV. Power-plant of aeroplanes—Fitting two engines to obviate

involuntary descents. ...........................................

TENTH SECTION THE TRAINING OF ARMY AIRMEN .........................

I. French thoroughness—An expert’s tribute—Sound training

all-important. ..................................................

II. How the military airman is "schooled"—His course of

instruction described. ..........................................

III. Rules for training—Dummy aeroplanes—A pupil’s first "hops." .

IV. Cross-country flights—The _vol plané_—Difficulty of first

observation tests from an aeroplane. ............................

V. Finishing work at French schools—Practical tests—German

thoroughness—Energy of English officers. ........................

ELEVENTH SECTION THE COST OF WAR AEROPLANES .......................

I. Why manufacturers charge high prices—Cost of experimental

work—Building of trial machines. ................................

II. Economy of a large military order for machines—The incidental

expenses. .......................................................

III. Question of renewals—General cheapness of an air-corps, as

compared with other forms of armament. ..........................

OUR AERIAL PROGRAMME FOR 1912-13 ..................................

TWELFTH SECTION PROBLEM OF ARTILLERY FIRE AND THE AEROPLANE .......

I. Conflicting opinions as to an aeroplane’s

vulnerability—Experiments which have been carried out. ..........

II. Shrapnel shell—Question of hitting a vital part of the

aeroplane—Difficulty of identifying friend or foe. ..............

THIRTEENTH SECTION DESTRUCTIVE POTENTIALITIES OF WEIGHT-CARRYING

AEROPLANES ........................................................

I. What a modern-type machine can raise—Load of two men, and

explosives. .....................................................

II. Effect of aerial bombardment upon cities and troops—German

tests. ..........................................................

FOURTEENTH SECTION WAR IN THE AIR BETWEEN HOSTILE AEROPLANES ......

I. Certainty of a combat between aeroplanes in actual

warfare—Air-scouts protected by aerial "cruisers." ..............

II. An encounter in the air—Importance to an army of an aerial

victory. ........................................................

FIFTEENTH SECTION VALUE OF THE AEROPLANE IN NAVAL WARFARE .........

I. Machines for coastal and high-seas work—Question of flying in

winds. ..........................................................

II. Interesting tests—Machines for rising from water, and landing

on a ship’s deck. ...............................................

SIXTEENTH SECTION AERIAL WORK IN THE FRENCH AND GERMAN AUTUMN

MANOEUVRES, 1911 ..................................................

I. French successes—Proof of the value of organisation—Flights in

high winds. .....................................................

II. Work in the German manœuvres—An instance of the utility of

air-scouts—Reconnoitring from high altitudes. ...................

III. Aeroplanes in actual warfare—What Italian airmen accomplished

in Tripoli—Scouting and bomb-dropping under service conditions. .

IV. A final word—Conclusions to be arrived at—Problems

outstanding. ....................................................

*ILLUSTRATIONS*

CLAUDE GRAHAME-WHITE. Winner of the Gordon-Bennett Aviation Cup,

1910; author of "The Story of the Aeroplane"; and joint author, with

Harry Harper, of "The Aeroplane: Past, Present, and Future," "Heroes

of the Air," and "The Aeroplane in War." ..........................

THE NIEUPORT MONOPLANE. Photo, M. Branger. This exceedingly

interesting machine, which won the great French Military Trials, is

generally admitted to be one of the most efficient flying machines

in existence. A similar machine can be seen at work in Hendon, where

it is piloted by Mr. Grahame-White. ...............................

BRITISH-BUILT SCOUTING MONOPLANE. This aircraft, an exceedingly

fast, single-seated machine, represents the type of machine now

favoured by French authorities for urgent, rapid, general

reconnaissance. Its constructors are Messrs. Short Brothers. ......

READY FOR A SCOUTING FLIGHT. Here a latest-type reconnoitring

monoplane, with its observer in the front seat and the pilot behind

him, is seen just about to start upon an aerial voyage. The machine

is a British-built Bristol, such as will be used in the forthcoming

military trials. ..................................................

TWO-SEATED, BRITISH-BUILT WAR MACHINE. The Blackburn military-type

monoplane, with accomodation for pilot and observer, has already

made many successful flights; and it is expected to perform

meritoriously in the War Office trials. In some respects it

resembles the graceful Antoinette. ................................

THE ENGINE-IN-FRONT BIPLANE. With the above machine—a type

increasingly used for Service work—the Naval officers now

experimenting at Eastchurch, Isle of Sheppy, have been carrying out

recent tests. It was designed, and built, by Messrs. Short Brothers,

who are now constructing special aeroplanes for Naval use. ........

MILITARY BIPLANE WITH TWO ENGINES. This exceedingly interesting

machine, which possesses especial significance from the military

point of view, is equipped with two Gnome motors. One drives two

propellers placed in front of the main-planes, and the other

actuates a single rear propeller. Normally, both engines run at easy

speed; but, should one fail in flight, the other, by being

accelerated, will maintain the machine in the air. Its designers and

builders are Messrs. Short Brothers. ..............................

BUILDING WAR AEROPLANES. In this picture—taken in the Bristol

works—skilled artizans are seen busy with the building of the bodies

of a consignment of military-type monoplanes. Although apparently

frail, these frameworks are—owing to their method of

construction—immensely strong. ....................................

WEIGHT-CARRYING WAR BIPLANE. By Fitting "extensions" to the upper

main-plane of the machine, as seen above, it is possible to achieve

sustained flight with two, or even three occupants—or, should

necessity arise, with a pilot and an appreciable load of explosives!

The actual machine photographed is a Bristol, flying over the

Brooklands aerodrome. .............................................

WAR MONOPLANES "VOL PLANE." In the above picture, a two-seated,

military type Bristol monoplane is seen descending, with engine

stopped and propeller motionless, from a reconnoitring flight. Pilot

and passenger are plainly discernable. ............................

MAPS FOR MILITARY AIRMEN. Photo, M. Roe. The French authorities are

busy with the preparation of a complete set of "air maps" for the

use of the military pilots, when flying from point to point. A

section of one of these maps—which are coloured—is illustrated

above. ............................................................

THE PILOT’S SEAT. Photo, M. Branger. In the illustration above is

seen the driving seat of a military-type Blériot monoplane, with the

airman’s map, in its case, fixed immediately before him. ..........

PILOT AND "OBSERVER." Photo, M. Roe. The above photograph shows a

military-type Breguet biplane, as used in the French manœuvres, with

pilot and observer in their places. ...............................

MILITARY AIRMAN’S REPORT. Photo, M. Branger. After descending from a

reconnoitring flight on a Blériot monoplane, in the French

manœuvres, the pilot seen above is imparting details of what he has

observed to another officer. ......................................

TRANSPORT OF WAR AEROPLANES Photo, M. Roe. In the manner depicted

above—and also by means of motor lorries—were military aeroplanes

transported from point to point during the French manœuvres. ......

MOTOR TRANSPORT. Photo, M. Branger. This picture shows how a Breguet

military biplane, with its main-planes folded by the sides of its

body, can be towed from point to point behind a motor-lorry. ......

TRAVELLING WORKSHOP. Photo, M. Branger. In the French manœuvres, a

completely-equipped aeroplane repair shop, in the form of a

motor-wagon, followed the military airmen as they moved from point

to point. One of these invaluable "ateliers" is pictured above. ...

FIRST SECTION REVIEW OF PROGRESS PRIOR TO THE FIRST MILITARY TESTS OF

AEROPLANES

I. Dawn of flight—Encouragement in Europe and America—England’s lost

opportunities—The pioneers.

In order to pave the way for a description of what the war aeroplane, as

we know it to-day, can accomplish, it is necessary to trace—although

only briefly—the development of the heavier-than-air machine during

recent years.

One fact immediately claims the attention of any student of this

question. He sees that England might to-day, had she not shown initial

apathy, be the first nation in the world in the fostering, and

development, of aerial navigation.

Instead of holding such a proud position, however—and any nation may

well be proud of having encouraged this new art—we suffer for having

displayed a lack of interest in the conquest of the air, and for having

given practically no help to far-seeing enthusiasts who first devoted

themselves to the great problem.

There was no lack of pioneers in England; but, instead of giving them

assistance, we discouraged them, with the result that such countries as

France and Germany—wide awake to all forms of progress—have moved

forward from one triumph to another.

More than a hundred years ago, for instance, England had an opportunity

of displaying a definite interest in flying. Sir George Cayley, a

remarkably clever engineer, turned his attention to the design of a

flying machine, and actually produced, in the year 1809, plans of a

machine which anticipated many constructional features of the monoplane

as it is built to-day. Of course there was not, in those days, any such

efficient motive power as is now supplied by the petrol engine; but Sir

George Cayley lectured upon his ideas, and sought to interest people in

them. Had his deductions been greeted with enthusiasm, it is not

probable that any successful flying machine would immediately have been

produced; the difficulty of finding a reliable propelling medium would

have prevented this. But what a ready and encouraging acceptance of Sir

George Cayley’s pioneer work would inevitably have done, would have been

to turn the minds of other inventors towards the problem, and so pave

the way for a series of discoveries, each more important than its

predecessor.

The imaginations of those who might have exercised a great influence

upon future progress were not fired, however; and the same remark

applies to the efforts of those who followed in Sir George Cayley’s

footsteps, and endeavoured to give his ideas more practical shape.

Stringfellow and Henson, for example, pored over the great engineer’s

drawings, and produced working models of a flying machine. Their

apparatus was crude, it is true; but this toil represented so many steps

forward along the path of progress. It had been man’s ambition, for

centuries, to fly; success could not be expected without infinite

labour. Nothing definite came of the work of these pioneers, however.

They had little encouragement; they were regarded as "cranks." The

importance of the work they were engaged upon was not, indeed, realised.

Now, as a striking contrast, let us turn to the reception which early

enthusiasts received in other countries. Let us take France, for

example. Ader, an electrical engineer, devised, in 1896, a very

ingenious, bat-like aeroplane. With it, having fitted a small

steam-engine, he actually achieved a short flight—or, rather, a brief

"hop" from the ground.

Instead of being greeted apathetically, or having his sanity doubted,

Ader was promptly called to appear before the military authorities.

They, after hearing his theories expounded, cheerfully voted him £20,000

in order that he might continue his experiments upon an adequate scale.

Thus, even at this early stage, France revealed her keen interest in

aerial navigation. Ader, lacking the petrol motor, could not carry his

investigations much further. But the encouragement he received gave

heart to other inventors. And so France went forward to success.

America offers another example of a sane, far-seeing policy. Professor

Langley, an eminent scientist, was making a series of wonderfully

interesting model aeroplanes at about the time Ader was experimenting in

France. To further his work, the American authorities very promptly came

forward with a grant of £10,000.

He, like Ader, was unable to carry his individual experiments to a

successful issue; but further investigation, on the part of other

workers, was greatly stimulated. It is interesting to note what position

these two countries, which first encouraged flying, afterwards took when

the aeroplane became a reality.

To America, in the work of the Wright brothers, has gone the honour of

the first practical flights with a heavier-than-air machine, while

France is to-day the premier nation in the world in the development of

airmanship.

Thus it is legitimate to pass to a consideration of the first machines

that flew, and consider their capabilities from the military point of

view. The Wright biplane, naturally, is the first to attract attention,

because it was as long ago as 1903 that these two quiet, determined

Americans made their first successful flights. From a military aspect,

this aeroplane had many drawbacks; and to cite them is instructive,

seeing that, by this means, a reader will be better able to judge, later

on, what vast strides towards perfection the aeroplane has already made.

The first Wright biplane would, indeed, just fly; that was all. Its

pilot only dared to leave the ground when an absolutely dead calm

prevailed; he feared the overturning influence of even the smallest gust

of wind. His engine, being then a novelty as applied to the aeroplane,

required the most patient "tuning up" before even a brief flight could

be essayed; and, when it was aloft, the machine only passed through the

air quite close to the ground.

Each flight had to be started by sliding the aeroplane forward along a

rail; away from this rail, the machine was helpless. From the point of

view of a military expert, indeed, this early machine could have been

condemned upon several counts. It was unreliable. It could not fly in

gusty winds; it was not portable; it could only take the air when

launched from its rail.

But the true expert is far-seeing. He makes light of present

imperfections if, in any idea, he can see future developments of

undoubted importance. Such an expert, for instance, was the late Captain

Ferber, of the French Army. He was the first military officer to whom

the task fell of reporting, for his Government, upon the capabilities of

a military aeroplane.

Representations were made by the Wright brothers to the French

Government in the year 1905—two years after their first flights. They

had improved their machine considerably; they were now ready to carry a

passenger; and they wished to sell their secret. So Captain Ferber was

instructed to go to America and investigate their claims.

The Wrights were anxious to sell their secret for a lump sum of money.

They had begun their experiments in the humblest possible way, being

small cycle-makers at Dayton, Ohio; and they were unable to protect, by

patents, the machine which they had evolved by so vast an amount of

patient work.

Thus they sought to enter into negotiations with some Government. They

asked for a guarantee that their machine would be bought, for a certain

price, were it to perform a series of stipulated flights. Their position

was, as a matter of fact, a somewhat awkward one. Even a brief

examination of their aeroplane, by an expert, would have revealed its

principle.

In this quandary, they were led to approach the French Government. They

chose France for a very good reason. Already, as has been indicated,

this country was keenly alive to the possibilities of flying. The two

brothers imagined, therefore, that they would be able to make their best

bargain with the French Government.

The practical interest which the French authorities took in the question

of military flying was evidenced by their action when they received a

communication from the Wright brothers. Although reports of the Wrights’

experiments had been greeted, in Europe, with great scepticism, and

there was reason, in view of the failure of other inventors, to doubt

their claims, the French Government at once detailed Captain Ferber to

make the long journey to Ohio, so as to go into the matter in a

business-like way.

Captain Ferber, who was one of the first officers in France to become

actively interested in airmanship, duly visited America, and interviewed

the Wright brothers. They could not show him their machine. Had they

done so, their secret would have been revealed. Regarding the flights

which they had made, up to this time, Captain Ferber had to rely, for

testimony, upon the statements of certain responsible men living in

Dayton, who had witnessed them.

The position, so far as he was concerned, was rather an unsatisfactory

one. It was like buying "a pig in a poke." But this officer, being a

student of character, and an enthusiast regarding flight, saw what

manner of men these two brothers were. He did not doubt their word, nor

the statements of those who had seen them fly. So, when he returned to

France, he recommended his Government to enter into negotiations with

the Wrights, and buy their invention before any other nation took steps

to secure it.

It was a tribute to his foresight that he should have done this; but,

for the time being, the negotiations fell through. The Wrights, for one

thing, wanted a very considerable sum of money; and there was

difficulty, also, in arranging what the series of tests of their

aeroplane should be. Thus it was that, after many communications had

passed between the interested parties, the matter stood in abeyance.

In the meantime, however, other inventors were striving with the great

problem. In France, in 1906, Santos-Dumont effected "hops" with a

machine like an exaggerated box-kite; and this led the way to the

remarkable achievements of two particularly clever brothers, Charles and

Gabriel Voisin. They busied themselves with a biplane which, at the end

of 1907, they asked Henry Farman, a well-known racing motorist, to test

for them.

This led to the first famous flights of the Voisin machine at the

military parade-ground of Issy-les-Moulineaux, outside Paris. France

went wild with enthusiasm when this big, clumsy machine, piloted by the

quick, agile Farman, succeeded in flying for a mile, and in making a

turn while in the air.

The Voisin aeroplane needed to run along the ground for quite a hundred

yards before it could gain sufficient support from the air to enable it

to rise. When it did so, it was only just able to skim along above the

ground. Compared with present-day aeroplanes, it was an unwieldly,

unsatisfactory machine; and, to make matters worse, its motor became

overheated after only a minute or so’s running.

As a machine for military purposes, it would have been useless. But it

represented a definite stage in the progress of aeroplaning. From this

machine of the Voisin brothers, which Farman first flew, developed the

great school of biplane construction in France.

Also experimenting in France, at the same time as the Voisin brothers,

was another great master of flight—M. Louis Blériot. His methods were

original. He pinned his faith to the monoplane.

II. First practical flights—The Wright brothers; the Voisins; Farman—The

cross-Channel flight.

Hastening our review, in order to reach matters of more definite

interest from the military point of view, we find that, in 1908, the

Wright brothers made aerial history by a series of magnificent flights

which were, however, unfortunately marred by a tragedy.

Coming to France, Wilbur Wright flew for a couple of hours, without

descending, at Le Mans. At about the same time, in America, Orville

Wright was carrying out a series of demonstrations before the military

authorities. He achieved remarkable success, particularly from a war

point of view, by carrying a passenger in his machine for quite a long

flight.

[Illustration: THE NIEUPORT MONOPLANE.

Photo, M. Branger.

This exceedingly interesting machine, which won the great French

Military Trials, is generally admitted to be one of the most efficient

flying machines in existence. A similar machine can be seen at work in

Hendon, where it is piloted by Mr. Grahame-White.]

Then, when taking up Lieutenant Selfridge, of the American army, he met

with disaster. One of the propellers of his machine broke; it crashed to

the ground from a height of about 100 feet. Lieutenant Selfridge was

killed, being the first victim of the aeroplane, and Orville Wright

broke his thigh. The accident, as may be imagined, cast a gloom over

flying in America for a long time.

Longer flights by Henry Farman, on an improved Voisin biplane, were also

to be noted in the year 1908; and thus the way is cleared for a

description of the wonders achieved in 1909, when it may be said that

the importance of the aeroplane, from a military point of view, was

first demonstrated, and the attention of nations seriously directed

towards the possibilities of this new "arm."

Early in the summer of 1909, after innumerable disappointments, and the

breaking-up of many experimental machines, Blériot began to achieve

success with a simply-constructed monoplane, driven by an equally simple

three-cylinder petrol motor; and, at the same time, another French

monoplane, the Antoinette, larger than Blériot’s, and having an

eight-cylinder motor developing sixty horse-power, was also flying

surprisingly well.

It was in July, 1909, that these two machines, representing a distinct

type, when compared with the biplane, were brought down to the French

coast at Calais with the intention of invading England by air, and

winning a prize of £1000 offered by the _Daily Mail_. Piloting his small

monoplane was M. Blériot himself, while the Antoinette was flown by Mr

Hubert Latham, an airman already famed for his daring.

The method of Blériot’s arrival at Calais gave promise of the eventual

utility of his machine from the military point of view. The two wings of

his monoplane could easily be detached. They were then folded on either

side of the body of the machine; and, thus dismantled, it could be

placed for transport upon an ordinary railway truck.

In this fashion it reached Calais, greatly to the surprise of those who

had, hitherto, only been familiar with the huge cases needed for the

transport of biplanes. When taken from the railway van, the monoplane

was tied with ropes behind a motor-car, and ran upon its own

pneumatic-tyred wheels to the shelter prepared for it near the

sand-hills of Les Baraques, a mile or so from Calais.

Blériot, as history records, won the £1000 prize by flying across the

Channel from France to England, just after the dawn on 25th July, 1909.

He landed near Dover Castle, after a flight of thirty-seven minutes.

Latham, unfortunate with his engine, made two attempts at the crossing,

but fell into the sea on both occasions.

Blériot’s feat made a deep impression upon all thoughtful men, and

particularly upon the military authorities in France. If such a flight

could be achieved with a small, crude machine, what might not be

possible with a perfected apparatus? This, naturally, was the question

which was asked.

In the next important demonstration of the possibilities of flight,

which was made at the Rheims flying meeting, held in August, 1909, the

French Government took a very active interest. They sent special

representatives to this meeting—the first of its kind—to study the

various types of flying machines which took part in the contests

organised. As a further instance of the practical ideas already being

displayed by military men in France, it may be mentioned that one of the

competitors at this memorable flying meeting was the French officer

whose work has previously been mentioned—Captain Ferber. He flew a

Voisin biplane. It was not, unfortunately, very long after the Rheims

meeting that this enthusiastic military airman met with his death at

Boulogne, his loss being sincerely mourned by the French Government. His

biplane overturned in a ditch, and he was killed by the heavy motor,

which was torn from its bed, and fell upon him.

III. Aeroplanes at Rheims, 1909—Wright, Voisin, Farman, Blériot,

Antoinette—The Gnome engine—First military orders.

Seeing that the Rheims meeting of 1909 was the first occasion upon which

a definite military inspection of aeroplanes was made, it should be

interesting to describe the machines which were then available. Let us

take, for example, the Wright biplane, of which we have previously

spoken. This machine, as piloted at Rheims by Lefevre, Tissandier, and

the Comte de Lambert, undoubtedly proved itself one of the best

all-round machines then in existence.

The aeroplane represented the usual biplane form of building, having one

sustaining plane fixed above another, the two being held apart by wooden

struts, made taut by cross-wiring.

In front of these main-planes, upon outriggers, was a small double-plane

elevator. At the rear of the main-planes, also carried upon outriggers,

was a double-plane vertical rudder. The engine of the machine, set upon

a wooden bed on the lower plane, actuated two wooden propellers,

which—driven by chains—revolved in opposite directions behind the

main-planes.

The pilot’s seat was on the front edge of the lower main-plane, and his

control of the aeroplane, when in flight, was effected by means of two

levers. One, moved forward and backward, actuated the elevating planes,

and the other was given a dual motion. Moved to and fro, it operated the

rudder of the aeroplane. Shifted from side to side, it warped the rear

extremities of the main-planes, and so controlled the lateral stability

of the aeroplane.

This wing-warping mechanism was, as a matter of fact, one of the salient

features of the Wright biplane. The system is considered to be the most

efficacious method of combating the effect of wind-gusts when an

aeroplane is in flight.

In operation, this wing-warping device was simple. When the airman

discovered that his machine was tilting over one side, owing to a sudden

inequality in wind pressure, he quickly warped down the plane-ends on

the side of the biplane that was depressed. The result was that there

was increased wind-pressure under the plane-ends warped down, thus

tending to force the machine back again upon an even keel.

The pilot who distinguished himself greatly at Rheims, when flying the

Wright biplane, was Lefevre; but this daring airman was, unfortunately,

killed shortly afterwards at Juvisy, when testing a new machine. At

Rheims he circled in the air, and effected sharp turns, in an altogether

remarkable way, demonstrating an absolutely complete control over his

machine. So impressed were the representatives of the French Government

by the performance of the Wright biplane, that they ordered several

machines for military use. This represented their first definite order

for aeroplanes for war purposes.

The chief drawback of the Wright biplane, in comparison with other

machines flown at this time, was that it needed to make a start into the

air from a launching rail, as has previously been mentioned.

The advantage of this system of starting—in which a weight, dropped from

a derrick, gave the aeroplane its initial impetus along the rail—was

that the machine could be fitted with a lower-powered engine.

But the disadvantages were obvious. Were an involuntary descent made at

a point some distance away from the machine’s rail, it had to be carted

back to the starting-point, or a rail and derrick brought to the place

where it lay. However, the French Government did not regard any

aeroplanes at this time as representing serviceable war weapons. They

took the wise view that they were purely instructional craft, upon which

military airmen could gain experience, and so fit themselves for the use

of the more perfect machines which were likely to be evolved as time

went on.

After describing the Wright biplane, we may now consider the Voisin

machine. This aeroplane represented an improvement upon the type first

piloted by Farman at Issy-les-Moulineaux. It had two main supporting

planes, like those of the Wright biplane, fitted one above another. In

front of the main-planes was a single horizontal elevating plane. At the

rear of the biplane was a large cellular stabilising tail, made up of

horizontal and vertical planes, and resembling a box-kite. In the centre

of this cellular tail was the rudder, a single vertical plane.

Instead of adopting a wing-warping device, for maintaining lateral

stability, the Voisin brothers fitted vertical planes, or curtains as

they were called, between their main-planes. These, when the machine was

in flight, resisted any sideway roll and, in conjunction with movements

of the rudder, gave the aeroplane a certain amount of automatic

stability.

The biplane rested upon a chassis made of hollow metal tubing. It had

pneumatic-tyred bicycle wheels, mounted in connection with heavy

springs, to resist the shock of landing after a flight. Small wheels

bore the weight of the tail when the aeroplane was running along the

ground.

An engine of sixty horse-power, fitted upon the lower plane, drove a

two-bladed metal propeller, placed behind the main-planes. The pilot,

seated midway between the planes, operated a wheel like that of a

motor-car. He pushed it away from him, or drew it back, to operate the

elevating plane, and turned it sideways to actuate the rudder.

This machine had the advantage over the Wright biplane that it was not

dependent upon a starting rail. But, in general comparison with the

Wright machine, it was heavy and sluggish. It required a long run before

it would lift into the air, and its engine-power, although twice that of

the Wright biplane, was only just sufficient to make it fly. In a side

wind, owing to the influence which the gusts exerted upon the vertical

panels which were fitted between the main-planes, it made an appreciable

amount of "lee-way," which rendered steering difficult.

Altogether, regarded from the point of view of experts to-day, it was a

heavy, awkward machine. But it flew, and flew steadily. And anything

that flew, in the year 1909, represented a triumph. Several famous

airmen were piloting the Voisin biplane at the Rheims meeting, notably

M. Louis Paulhan and M. Rougier.

From a military aspect, the Voisin biplane had many drawbacks. It was

not at all portable; it could not rise quickly; it was slow-flying. But,

with the very laudable intention of encouraging such ardent pioneers as

the Voisin brothers, the French Government gave orders for certain

military machines of this type.

Now we may turn to what was undoubtedly the most successful biplane at

the great Rheims carnival—that designed and flown by Mr Henry Farman.

This famous airman had, it will be remembered, first learned to fly upon

a Voisin biplane. After piloting this machine in 1908, he turned his

attention, early in 1909, to the design of a biplane which should be

lighter and more efficient.

In this endeavour, he certainly succeeded. The biplane which he first

flew in public at the Rheims meeting represented a distinct step forward

in the development of this type of machine. In general construction, it

was lighter than the Voisin machine, and it had other excellent features

as well. Instead of the heavy, cellular tail, as fitted to the Voisin

biplane, it had a lightly-constructed tail made up of two horizontal

planes, with a vertical rudder fitted between them. In front of the

main-planes, upon light wooden outriggers, was placed the horizontal

elevating plane.

One of the features of this machine, was its method of obtaining lateral

stability. Farman recognised the disadvantages of the vertical planes,

as used in the Voisin machine. So he fitted small flaps, or horizontal

planes, at the rear extremities of his mainplanes. These were hinged to

the main-planes, and were termed "ailerons."

Their operation produced the same result as in the application of the

wing-warping device of the Wright brothers. When the biplane tilted

sideways in flight, the "ailerons" were drawn down, by means of

controlling wires, on the side that was depressed. The air pressure,

acting upon the surfaces of the "ailerons," forced the aeroplane back

upon an even keel. When not in operation, the "ailerons" flew out

straight in the wind, on a level with the main-planes.

The control of the Farman biplane was effected by means of a hand and

foot lever. The hand lever, when moved forward or backward, operated the

elevating plane. When shifted from side to side, it actuated the

"ailerons." The pilot’s feet rested upon a pivoted bar, which he swung

from side to side to move the rudder of the machine.

[Illustration: BRITISH-BUILT SCOUTING MONOPLANE.

This aircraft, an exceedingly fast, single-seated machine, represents

the type of machine now favoured by French authorities for urgent,

rapid, general reconnaissance. Its constructors are Messrs. Short

Brothers.]

Another constructional feature of this first Farman biplane was notable.

This was the landing chassis. Appreciating the disadvantages of the

Wright launching rail, and recognising that the Voisin chassis was

heavy, Farman aimed at something lighter, and at the same time more

efficient.

Again he succeeded. He devised a chassis which was a combination of

wooden skids and bicycle wheels. Below his biplane, upon wooden

uprights, were fitted two long wooden skids. On either side of each

skid, were two little pneumatic-tyred bicycle wheels, connected by a

short axle. The wheels were held in position on the skid by stout rubber

bands, which passed over the axle.

Normally, the skids were raised off the ground by the wheels, upon which

the biplane actually ran. But, in the case of a rather abrupt descent,

the chassis was so designed that the wheels were forced up against their

rubber bands, thus allowing the skids of the machine to come into

contact with the ground. Then, when the force of the shock had been

absorbed, the wheels came into play again. With this biplane, Farman

achieved fine flights at Rheims.

Apart from its constructional excellence, the biplane was fitted with a

motor which was destined to have a remarkable influence upon the

development of flying—and upon military aviation in particular. This was

the seven-cylinder, revolving "Gnome." To-day, the application of this

wonderful engine is practically universal. In August, 1909, it was

regarded quite as a freak, and was seen for the first time upon Henry

Farman’s biplane.

Up to the time when this motor was introduced, makers had, in designing

aeroplane engines, followed very largely upon motor-car design,

constructing motors with fixed cylinders, either upright, or in "V"

shape, and with their parts lightened wherever possible. Some were

water-cooled; others air-cooled. But with both systems, and particularly

with the latter, the tendency—owing to the high speeds at which the

engines had to turn—was to overheat, and either lose power, or stop

altogether.

The specially-lightened water-cooling systems which were devised gave a

great deal of trouble; and, in the case of air-cooled engines, it was

usually found almost impossible to prevent overheating, after the

engines had been running for ten minutes or a quarter of an hour.

In the case of the "Gnome," the designer struck out in a new line.

Instead of making his cylinders fixed, and his crank-shaft revolving, as

was the method with other engines, he set his seven cylinders revolving

around the crank-shaft. Petrol and oil he fed to the cylinders by way of

the stationary hollow crank-shaft.

The internal complications of this engine, in the opinion of experts who

first saw it, were such that it could not be expected to achieve

reliability.

But it did, nevertheless; and it ran so well, in fact, that, at the

Rheims meeting, Henry Farman remained in the air, while using it, for

more than three hours, and won the prize for the longest flight.

The advantages of this remarkable engine proved to be many. In the first

instance, its method of construction enabled it to be built remarkably

light; and the fact that the seven cylinders revolved, generally at a

speed of 1000 revolutions a minute, effectually disposed of cooling

difficulties. In fact, the engine automatically cooled itself; and its

fly-wheel effect, as it flew round, gave a smooth, even thrust to the

propeller.

From the very day of its first introduction, the "Gnome" motor gained

overwhelming success. It represented a piece of mechanism made specially

for the work in hand, and not a motor-car engine adapted to aerial

purposes. This fact was the secret of its success.

As rapidly as they could acquire them, other aeroplane makers fitted

"Gnomes" to their machines. It proved all-conquering. Fixed-cylinder

engines did not languish completely, however. Some of them were steadily

improved, and performed reliable work. But the "Gnome" was then, and is

now, regarded as _the_ aeroplane engine.

The Farman biplane, being so good a machine in itself, and being

equipped, in addition, with so excellent a motor, naturally aroused keen

military interest; and it was not long before the inventor received

Government orders for his machine. At this time, before the monoplane

had assumed the commanding position which it now holds, the Farman

biplane certainly represented the premier aeroplane of the day.

Two more machines, which were flown at the first carnival of flight at

Rheims, merit careful description. These were the Blériot and Antoinette

monoplanes. Blériot’s machine, of the type upon which he crossed the

Channel, was especially interesting.

Its simplicity was, as has been stated, its great recommendation. Upon

either side of a tubular body, built up of light woodwork, and partly

covered in with fabric, were the two supporting planes, outstretched

like the wings of a bird, and supported by wires, above and below.

In the front of the body was the engine, which developed about

twenty-five horse-power, and had three air-cooled cylinders. At the rear

extremity of the body, which projected some little distance behind the

lifting planes, was a small stabilising and weight-carrying plane, the

end portions of which, on either side, were capable of being moved up

and down. Behind this plane, fitted to the end of the body, was a small

vertical rudder.

The pilot sat in the body of the machine, a little behind the engine,

and on a level with the rear extremities of his wings. His method of

control was extremely simple. Rising up between his knees was a metal

_cloche_, or lever. This he shifted forward or backward to make his

machine rise or fall, the movement of the lever actuating the

extremities of the rear stabilising plane.

For maintaining the lateral stability of the monoplane, he moved the

same lever from side to side. This action drew down, or warped, the rear

portion of the supporting planes—effecting the same action, in fact, as

produced in the case of the Wright biplane. When wishing to make a turn,

the pilot pushed from side to side a bar upon which his feet rested.

This moved the rudder at the rear of the body.

Already, as can be seen, the control of an aeroplane in flight had

become more or less standardised. One lever was usually employed for

elevating and lowering the machine, and also for controlling lateral

movements. Steering was effected, as a rule, by movements of the pilot’s

feet.

Another machine, representing these first types, which it will be

necessary to describe, is the Antoinette monoplane. This machine had,

and has still, many original features. It was, to begin with, a very

ambitiously-designed machine. It had very large and strongly-built

wings. These were set at a dihedral angle, so as to increase the

machine’s stability. The engine, developing sixty horse-power, was fixed

in the bow. The body of the machine, which was appreciably longer than

that of the Blériot monoplane, ended in fixed horizontal and vertical

planes, or "fins," rather resembling the feathering of an arrow. Hinged

horizontal planes, at the extremity of the tail, provided means for

elevating or lowering the machine. Vertical rudders were also fitted.

The controlling mechanism was original. On either side of the pilot, as

he sat well back in the body of the monoplane, was a wheel. These wheels

he turned when he wished to rise or descend, or correct the lateral

stability of the monoplane.

By means of this wheel control, which locked the planes in any desired

position, a very fine adjustment was possible. But the manipulation of

the wheels, with which separate movements had to be made with each hand,

was declared by many airmen to be difficult to learn. On the first of

the Antoinette machines, it should be mentioned, "ailerons," or

balancing flaps, were used to control lateral stability. Afterwards,

however, wing-warping was adopted, and adhered to.

Such were the first aeroplanes, as seen at Rheims in the year 1909.

Other more experimental machines there were, too, which did not figure

prominently at the time, but which were destined to play a prominent

part in future work. In this regard should be mentioned the R.E.P.

monoplane, designed and built by M. Esnault Pelterie, and the Breguet

biplane, designed, built, and flown by M. Louis Breguet.

IV. The human factor—Growing skill of airmen—Feats of 1910, as compared

with those of 1909—Cross-country flying.

What the aeroplanes which we have been describing could not do was to

combat a wind. No flight was essayed, indeed, unless weather conditions

were quite favourable. A notable exception must, however, be made in the

favour of the Antoinette monoplane. This aircraft, owing to its weight

and stability, and the skilful and daring handling of Mr Latham was, on

several occasions in 1909, and notably at the Blackpool flying meeting,

able to remain aloft in very high and gusty winds.

Apart from the question of wind-flying, which was, of course,

all-important, there were grave structural drawbacks in connection with

many of these early machines. Some were too light; others too heavy.

Save with those upon which the "Gnome" engine was fitted, there was

almost constant engine trouble.

Above all, however, the human factor entered into the question. Men were

_learning_ to fly. Apart from any consideration of the good or bad

points of their machines, they were invading a new element. As one

shrewd observer, at this time, remarked: "The men who fly now are like

those who first ventured upon the sea in frail cockle-shells. They

tremble at their own daring."

More might have been accomplished in 1909, in fact, had men possessed

greater confidence.

Take, for example, the attempts which were made, at the Rheims meeting,

to win the altitude prize. To the amazement of spectators, one pilot

rose until he flew slightly more than 500 feet high. This feat was, in

1909, considered a marvellous one. In 1911, only two years later, a man

rose to an altitude of nearly two-and-a-half miles! The heights attained

in 1909 could, indeed, have been appreciably increased had men possessed

the necessary confidence in themselves, and in their machines, to force

them higher.

But, in these pioneer days, a height of 150 feet or 200 feet from the

ground was considered quite an appreciable altitude. Nowadays, when

carrying out a long cross-country flight, an airman will fly several

thousand feet high. Thus it can be seen what definite progress has been

made in this aspect of flying alone.

High-flying has considerable importance. The airman who does not soar

high, when going across country, meets the worst of whatever wind is

blowing. It eddies from hill-tops, and around woods. The higher he

flies, therefore, the steadier the wind blows, because it is unaffected

by any inequalities of the ground. This is why the great cross-country

flyers invariably ascend to a considerable altitude.

In the year 1909, it may truly be said, men were really learning to fly.

Their machines were crude, and they were invading a new element.

Therefore they made comparatively short flights, and confined nearly all

their operations to aerodromes, where there was always a smooth place of

descent below them, should the failure of their engines compel a hasty

landing.

But, in 1910, a new and more daring spirit developed. With growing

confidence, airmen soared higher and higher. Breezes no longer made them

hasten to descend; and, with this new spirit of adventure, came the

desire for cross-country flying, instead of monotonous circling round

the aerodrome.

With the commencement of long flights across country from point to

point, came the first practical opportunity for applying the aeroplane

to military reconnoitring work. The first cross-country flights marked,

indeed, a very definite stage in the development of the aeroplane; and

it was in 1910 that the possibilities of the flying machine, in this

regard, were demonstrated, on a convincing scale, by such aerial

contests as the flight from London to Manchester, and the Circuit de

L’Est in France—the first taking place early in the flying season of

1910, and the latter towards its end.

Two machines had, by this time, emerged as representing the best of

their type. One was the Farman biplane, with the invincible "Gnome"

motor; the other was the Blériot monoplane, now also equipped with the

"Gnome." So far as distinction can be made, the Farman machine stood for

ease of manipulation and general "air-worthiness"; while the Blériot

represented the development of a small, portable, high-speed machine.

It was on the Farman biplane that M. Louis Paulhan flew, with one halt,

the 183-miles aerial journey from London to Manchester; and Mr

Grahame-White (one of the joint authors of this book), who also piloted

a Farman, had the distinction of competing against him in what is now

regarded as an historic contest.

In the Circuit de L’Est in France, Leblanc, the winner, flew some 400

miles on his Blériot monoplane, passing over all sorts of country, and

finding his way accurately from point to point by means of his map and a

special compass. He made frequent landings, without damaging his

machine, and demonstrated its reliability in a most convincing way.

One question naturally arises, in any consideration of such flights as

these, seeing that they were so greatly superior to anything that had

been done in 1909. Had the aeroplanes which these pilots used been

improved to any remarkable extent? In reply, it is certainly accurate to

say that they had not. The "Gnome" engines with which they were fitted

had, it is true, been strengthened in small ways, and perfected in the

manufacture of certain delicate parts, the result being an even greater

reliability in running than had first been attained.

As regards the aeroplanes, they were, in essentials, the same which had

been flown in 1909. Their controlling mechanism was, for instance,

unaltered. Their method of construction was practically the same,

although experience had taught manufacturers the need of strengthening

certain parts. Landing devices had been slightly improved, from the

point of view of everyday wear.

Although aeroplanes and engines had both been improved a little, neither

had been altered sufficiently to account for such a vast stride forward

as was made in 1910. It was not to the machines, indeed, so much as to

the men, that this striking progress was due.

Practice had begun to make perfect. Pilots now felt more comfortable

when they were in the air. They had growing confidence in their

aeroplanes. They had learned how to maintain stability when assailed by

wind-gusts. Thus, they were ready to attempt far more ambitious flights.

SECOND SECTION FIRST EXPERIMENTS WITH AEROPLANES IN THE FRENCH AUTUMN

MANOEUVRES, 1910.

I. The historic Picardy tests—First official report upon movements of

troops, as gleaned by aeroplane.

After these introductory notes, intentionally brief, we are led to a

consideration of the first practical tests to which aeroplanes were put,

so far as their military use is concerned.

During the summer of 1910, the French authorities were instructing

officers in the handling of machines. They had purchased several Voisin,

Wright, and Farman biplanes, and possessed also a few monoplanes,

including Blériots and Antoinettes.

For the autumn army manœuvres of 1910, which were due to take place in

Picardy, it was decided to make as complete a test as possible of the

value of the aeroplane as a scout in time of war. Ten or fifteen

machines were requisitioned for the experiments, some being stationed

with each of the manoeuvring forces.

To augment the military pilots, several civilian airmen readily gave

their services, notably Mr Hubert Latham with his Antoinette, and M.

Louis Paulhan, flying a Farman.

Although this was the first time aeroplanes had been used in mimic

warfare, and although the airmen themselves, and the military

authorities, were naturally unacquainted with the best methods of

utilising the new "arm," astonishing results were nevertheless obtained.

Two French officers. Lieutenant Sido and Adjutant Menard, were highly

successful in their work. This was due to the fact they had gone through

a careful course of training and were, in consequence, familiar with the

task of compiling precise and informing reports of all that they saw

when upon a reconnoitring flight.

Lieutenant Sido acted as observer upon the Farman biplane which they

were using, and Adjutant Menard undertook the work of pilot. The former

carried maps with him, and made frequent notes as the machine flew from

point to point.

The value of the work these two officers were able to perform, is best

indicated by setting forth the actual result of two of their

reconnoitring flights. On the first occasion, acting under definite

instructions, they left a place named Poix at 6 a.m., and flew over a

sixty-kilometre course, being an hour and five minutes in the air,

before returning to their starting-point.

The Aeroplane in War · 第 12 / 34 题