Electric?

[SvingenB]

Maybe a bit low HP at the moment for general aircrafts, but a motorglider (RV-11?) with this motor would probably work?
http://www.electraflyer.com/

 

[az_gila]

Buy one here....

An electric self-launch sailplane is already on the market...

http://www.alisport.com/eu/eng/silent_b.htm

gil A

 

[Joel]

Another one

The Antares 20E has been flying about a year now.
link: http://www.lange-flugzeugbau.com/htm/english/products/antares_20e/antares_20E.html