EARLY DAYS OF THE NAVAL AIRSHIP SECTION--PARSEVAL AIRSHIPS,
ASTRA-TORRES TYPE, ETC.
The rapid development of the rigid airships in Germany began to create
a considerable amount of interest in official circles. It was realized
that those large airships in the future would be invaluable to a fleet
for scouting purposes. It was manifest that our fleet, in the event of
war, would be gravely handicapped by the absence of such aerial scouts,
and that Germany would hold an enormous advantage if her fleet went to
sea preceded by a squadron of Zeppelin airships.
The Imperial Committee, therefore, decided that the development of the
rigid airship should be allotted to the Navy, and a design for Rigid
Airship No. 1 was prepared by Messrs. Vickers in conjunction with
certain naval officers in the early part of 1909.
As will be seen later this ship was completed in 1911, but broke in two
in September of that year and nothing more was done with her. In
February, 1912, the construction of rigid airships was discontinued,
and in March the Naval Airship section was disbanded.
In September, 1912, the Naval Airship section was once more
reconstituted and was stationed at Farnborough. The first requirements
were airships, and owing to the fact that airship construction was so
behindhand in this country, in comparison with the Continent, it was
determined that purchases should be made abroad until sufficient
experience had been gained by British firms to enable them to compete
with any chance of success against foreign rivals.
First a small non-rigid, built by Messrs. Willows, was bought by the
Navy to be used for the training of airship pilots. In addition an
Astra-Torres airship was ordered from France. This was a ship of
229,450 cubic feet capacity and was driven by twin Chenu engines of 210
horse-power each. She carried a crew of six, and was equipped with
wireless and machine guns. The car could be moved fore and aft for
trimming purposes, either by power or by hand. This was, however, not
satisfactory, and was abandoned.
In April 1918, Messrs. Vickers were asked to forward proposals for a
rigid airship which afterwards became e known as No. 9. Full details of
the vicissitudes connected with this ship will be given in the chapter
devoted to Rigid Airships.
In July, approval was granted for the construction of six non-rigid
ships. Three of these were to be of the German design of Major von
Parseval and three of the Forlanini type, which was a semi-rigid design
manufactured in Italy. The order for the Parsevals was placed with
Messrs. Vickers and for the Forlaninis with Messrs. Armstrong.
The Parseval airship was delivered to this country and became known as
No. 4; a second ship of the same type was also building when war broke
out; needless to say this ship was never delivered. At a later date
Messrs. Vickers, who had obtained the patent rights of the Parseval
envelope, completed the other two ships of the order.
The Forlanini ship was completing in Italy on the declaration of war
and was taken over by the Italians; Messrs. Armstrong had not commenced
work on the other two. These ships, although allocated numbers, never
actually came into being.
PARSEVAL AIRSHIP No. 4
This airship deserves special consideration for two reasons; firstly,
on account of the active-service flying carried out by it during the
first three years of the war, and, secondly, for its great value in
training of the officers and men who later on became the captains and
crews of rigid airships.
The Parseval envelope is of streamline shape which tapers to a point at
the tail, and in this ship was of 300,000 cubic feet capacity. The
system of rigging being patented, can only be described in very general
terms. The suspensions carrying the car are attached to a large
elliptical rigging band which is formed under the central portion of
the envelope. To this rigging band are attached the trajectory bands
which pass up the sides and over the top of the envelope, sloping away
from the centre at the bottom towards the nose and tail at the top.
The object of this is to distribute the load fore and aft over the
envelope. These bands, particularly at the after end of the ship,
follow a curved path, so that they become more nearly vertical as they
approach the upper surface of the envelope. This has the effect of
bringing the vertical load on the top of the envelope; but a greater
portion of the compressive force comes on the lower half, where it
helps to resist the bending moment due to the unusually short
suspensions. A single rudder plane and the ordinary elevator planes
were fitted to the envelope. A roomy open car was provided for this
ship, composed of a duralumin framework and covered with duralumin
sheeting. Two 170 horse-power Maybach engines were mounted at the after
end of the car, which drove two metal-bladed reversible propellers.
These propellers were later replaced by standard four-bladed wooden
ones and a notable increase of speed was obtained.
Two officers and a crew of seven men were carried, together with a
wireless installation and armament.
This airship, together with No. 3, took part in the great naval review
at Spithead, shortly before the commencement of the war, and in
addition to the duties performed by her in the autumn of 1914, which
are mentioned later, carried out long hours of patrol duty from an east
coast station in the summer of 1917. In all respects she must be
accounted a most valuable purchase.
PARSEVAL AIRSHIPS 5, 6 and 7
Parseval No. 5 was not delivered by Germany owing to the war, so three
envelopes and two cars were built by Messrs. Vickers on the design of
the original ship. These were delivered somewhat late in the war, and
on account of the production of the North Sea airship with its greater
speed were not persevered with. The dimensions of the envelopes were
somewhat increased, giving a cubic capacity of 325,000 cubic feet.
Twin Maybach engines driving swivelling propellers were installed in
the car, which was completely covered in, but these ships were slow in
comparison with later designs, and were only used for the instruction
of officers and men destined for the crews of rigid airships then
building.
An experimental ship was made in 1917 which was known as Parseval 5; a
car of a modified coastal pattern with two 240 horse-power Renault
engines was rigged to one of envelopes. During a speed trial, this
ship was calculated to have a ground speed of 50 to 53 miles per hour.
The envelope, however, consumed an enormous amount gas and for this
reason the ship was deflated and struck off the list of active ships.
This digression on Parseval airships has anticipated events somewhat,
and a return must now be made to earlier days.
Two more Astra-Torres were ordered from France, one known as No. 8,
being a large ship of 4,00,000 cubic feet capacity. She was fitted
with two Chenu engines of 240 horse-power, driving swivelling
propellers. This ship was delivered towards the end of the year 1914.
The second Astra was of smaller capacity and was delivered, but as will
be seen later, was never rigged, the envelope being used for the
original coastal ship and the car slung to the envelope of the ex-army
airship Eta.
On January 1st, 1914, an important event took place: the Army disbanded
their airship service, and the military ships together with certain
officers and men were transferred to the Naval Air Service.
Before proceeding further, it may be helpful to explain the system by
which the naval airships have been given numbers. These craft are
always known by the numbers which they bear, and the public is
completely mystified as to their significance whenever they fly over
London or any large town. It must be admitted that the method is
extremely confusing, but the table which follows should help to
elucidate the matter. The original intention was to designate each
airship owned by the Navy by a successive number. The original
airship, the rigid Mayfly, was known as No. 1, the Willows airship No.
2, and so on. These numbers were allocated regardless of type and as
each airship was ordered, consequently some of these ships, for example
the Forlaninis, never existed. That did not matter, however, and these
numbers were not utilized for ships which actually were commissioned.
On the transfer of the army airships, four of these, the Beta, Gamma,
Delta and Eta, were given their numbers as they were taken over,
together with two ships of the Epsilon class which were ordered from
Messrs. Rolls Royce, but never completed. In this way it will be seen
that numbers 1 to 22 are accounted for.
In 1915 it was decided to build a large number of small ships for
anti-submarine patrol, which were called S.S.'s or Submarine Scouts.
It was felt that it would only make confusion worse confounded if these
ships bore the original system of successive numbering and were mixed
up with those of later classes which it was known would be produced as
soon as the designs were completed. Each of these ships was
accordingly numbered in its own class, S.S., S.S.P., S.S. Zero,
Coastal, C Star and North Sea, from 1 onwards as they were completed.
In the case of the rigids, however, for some occult reason the old
system of numbering was persisted in. The letter R is prefixed before
the number to show that the ship is a rigid. Hence we have No. 1 a
rigid, the second rigid constructed is No. 9, or R 9, and the third
becomes R 23. From this number onwards all are rigids and are numbered
in sequence as they are ordered, with the exception of the last on the
list, which is a ship in a class of itself. This ship the authorities,
in their wisdom, have called R 80--why, nobody knows.
With this somewhat lengthy and tedious explanation the following table
may be understood:
No. Type. Remarks.
1. Rigid Wrecked, Sept. 24, 1911.
2. Willows Became S.S. 1.
3. Astra-Torres Deleted, May 1916.
4. Parseval Deleted, July, 1917.
5. Parseval Never delivered from Germany.
(Substitute ship built by Messrs. Vickers).
6. Parseval Built by Messrs. Vickers.
7. Parseval Built by Messrs. Vickers.
8. Astra-Torres Deleted, May, 1916.
9. Rigid Deleted, June, 1918.
10. Astra-Torres Envelope used for C 1.
11. Forlanini Never delivered owing to war.
12. Forlanini Never delivered owing to war.
13. Forlanini Never delivered owing to war.
14. Rigid Never built.
15. Rigid Never built.
16. Astra-Torres See No. 8.
17. Beta Transferred from Army.
Deleted, May, 1916.
18. Gamma Deleted, May, 1916.
19. Delta Deleted, May, 1916.
20. Eta Transferred from the Army.
Fitted with car from No. 10.
Deleted May, 1916.
21. Epsilon Construction cancelled May, 1916.
22. Epsilon Construction cancelled May, 1916.
23. Rigid 23 Class.
24. Rigid 23 Class.
25. Rigid 23 Class.
26. Rigid 23 Class.
27. Rigid 23x Class.
28. Rigid 23x Class. Never completed.
29. Rigid 23x Class.
30. Rigid 23x Class. Never completed.
31. Rigid 31 Class.
32. Rigid 31 Class, building.
33. Rigid 33 Class.
34. Rigid 33 Class.
35. Rigid Cancelled.
36. Rigid Building.
37. Rigid Building.
38. Rigid Building.
39. Rigid Building.
40. Rigid Building.
80. Rigid Building.
In August, 1914, Europe, which had been in a state of diplomatic
tension for several years, was plunged into the world war. The naval
airship service at the time was in possession of two stations,
Farnborough and Kingsnorth, the latter in a half-finished condition.
Seven airships were possessed, Nos. 2, 3 and 4, and the four ex-army
ships--Beta, Gamma, Delta and Eta--and of these only three, Nos. 3, 4
and the Beta, were in any condition for flying. Notwithstanding this,
the utmost use was made of the ships which were available.
On the very first night of the war, Nos. 3 and 4 carried out a
reconnaissance flight over the southern portion of the North Sea, and
No. 4 came under the fire of territorial detachments at the mouth of
the Thames on her return to her station. These zealous soldiers
imagined that she was a German ship bent on observation of the dockyard
at Chatham.
No. 3 and No. 4 rendered most noteworthy service in escorting the
original Expeditionary Force across the Channel, and in addition to
this No. 4 carried out long patrols over the channel throughout the
following winter.
No. 17 (Beta) also saw active service, as she was based for a short
period early in 1915 at Dunkirk, and was employed in spotting duties
with the Belgian artillery near Ostend.
The Gamma and the Delta were both lying deflated at Farnborough at the
outbreak of the war, and in the case of the latter the car was found to
be beyond repair, and she was accordingly deleted. The Gamma was
inflated in January, 1915, and was used for mooring experiments.
The Eta, having been inflated and deflated several times owing to the
poor quality of the envelope, attempted to fly to Dunkirk in November,
1914. She encountered a snowstorm near Redhill and was compelled to
make a forced landing. In doing this she was so badly damaged as to be
incapable of repair, and at a later date was deleted.
No. 8, which was delivered towards the end of 1914, was also moored out
in the open for a short time near Dunkirk, and carried out patrol in
the war zone of the Belgian coast.
So ends the story of the Naval Airship Service before the war.
With the submarine campaign ruthlessly waged by the Germans from the
spring of 1915 and onwards, came the airship's opportunity, and the
authorities grasped the fact that, with development, here was the
weapon to defeat the most dangerous enemy of the Empire. The method of
development and the success attending it the following chapters will
show.