Ultralight Engine Options

[zaitcev]

On the topic of ultralight engines, Jim Wiebe posted a panegiric to Polini:
http://jameswiebe.wordpress.com/2014...e-ever-except/

[mrbarry]

Polini looks like a nice power plant to me .

but just go back and listen to the engine note, on the wankle 313 cc on the +KID+ airframe .

compared to this polini



id like to try these radials out ,,
sure would like to see images of it running , power out put seems low but the 3-cycl cool factor makes up for that

http://www.compactradialengines.com/mz430.html



or this 4 cyl radial ..

http://www.compactradialengines.com/mz570.html

i think the fuel burn is high on them though iaw the specs .



the 3 cyl in operation

[jedi]

no , its just the weight limits, by the time one builds a good strong wing , has an adequate crash cage and hangs on 5--60+ lbs of engine there is not a lot of weight left for faring..
skypup is cute https://groups.yahoo.com/neo/groups/Skypup-club/info

here is an example for the well heeled ,

http://windward-performance.com/spar...pecifications/

+5 /-4 , l/d 37/1 Vne 123 knts ,Empty Weight – 155 lbs

i have seen motor glider tests with this airframe & a Hirth F33 [45 lbs w redrive & electric start]
it is all kevlar and carbon fiber.. fixed engine pylon .

Windward Sparrowhawk motorglider does not make the FAR-103 powered stall speed limit. FAR 103 has no stall speed limit for gliders.

Konig type radial engines, three or four cylinder, are not something Leon (Compact Radial Engines) wants to sell. Costs and tooling are complications. Per many year old conversations.

[SkyLark'n]

I like the look of these engines. http://www.simoniniusa.com/