Check out this new Yamaha airplane conversion

[Trackwelder 12]

http://www.rotaryforum.com/forum/showthread.php?t=16100

I know that there is a better way to link sites but this will get you to a very interesting one using the yamaha genesis snowmobile engine converted to a rotax box good for 120 hp and up fairly light weight. Looks like he will build the adapter or sell the plans but the engine has seen some good flight testing

[C5Engineer 1170]

SWEET!!! So many options out there for powerplants.

[akflyer 1427]

I was watching that thread over there and was considering it... but then decided I want to stay as light as possible. This leaves me with no option but a 2 stroke for what I want to be able to do. Hope I did not make the wrong choice as this experimenting crap gets expensive