("Richard Lamb" wrote)
[snips]
Weight is always an issue. But it's not the only one.

I also have doubts about the 30-35 HP specification.
VW engines are fin area limited. While they can make the claimed
power - for a short time - once the heat limit is reached, the power
MUST be reduced to avoid overheating and failures.
I'd believe 20 to MAYBE 25 hp continuous.

So, all things considered, I think a two-stroke would be the proper
choice for a true ultralight.

254 pounds is a damned difficult limit.


http://www.aero-works.net/store/detail.aspx?ID=87
Horsepower 16.5 HP, Weight 7.85 lbs., Length 7.3 inches, Width 12.5 inches,
Propeller sizes 28 x 10, 32 x 12 ........$1,495.95

Two of these gives you 33 hp at 16 lbs.

What the heck ...a Tri-Motor. 50 hp for 24 lbs. g

Original CriCri had two 9 hp engines and it still managed 100+ mph.

http://www.flight.cz/cricri/english/...escription.php
"Nowadays, builders are using engines Valmet, JPX, Limbach, 3W, Rotax,
Zenoah, Hirth, and I am glad to see, that are recommended also Czech ZDZ
Model."

(For people [like me] who enjoy Googling for more information - engines)


Montblack
CriCri list at Yahoo