The BYU Benson Institute organized tests between the Solar Funnel
Cooker and the "old-fashioned" solar box oven. The solar box
oven cost about $70 and was made mostly of cardboard. It took
nearly two hours just to reach water pasteurization temperature.
The Bolivian report notes that "food gets cold every time the
pots are taken from and into the oven." The solar box oven
failed even to cook boiled eggs. (More expensive box cookers
would hopefully work better.)
An aluminized-mylar Solar Funnel Cooker was also tested in
Bolivia, during the Bolivian winter. Water pasteurization
temperature was reached in 50 minutes, boiled eggs cooked in
70 minutes, and rice cooked in 75 minutes. The Bolivian people
were pleased by the performance. So were we! (La Paz, Bolivia,
August, 1996).
I also donated two dozen solar funnel cookers for people
in Guatemala. These were taken there by a group of doctors
going there for humanitarian service. The people there also
liked the idea of cooking with the sun's free energy! For an
aluminized-Mylar Solar Funnel Cooker kit, please contact CRM
(licensed manufacturer) at +1 (801) 292-9210.
[Image: 10.jpg -- Photo description: This photo shows what
looks like the same style of funnel as in the above pictures
except that it doesn't look homemade but something produced
by a factory. The photo shows something which looks like
a machined metal/shiny plastic funnel.]