Duke engine.....

[chefwarthog]

Maybe one day, will see one of those in a Kitfox.....

https://www.youtube.com/watch?v=c19kn3drdFU

[cubtractor]

I think they are very interesting. 100 lbs for a 103hp aviation engine.

http://www.dukeengines.com/application/aviation/

[Danzer1]

I've been following this engines development and unfortunately they have not done anything significant since 2011 - not even a website update.

BTW - that 103hp was at 3300rpm.

It's still an interesting concept, but to date - that's all it still is!