need advice on engine choice

[iamrandy]

I have a Fournier RF4 motor glider that needs an engine. It is .60 sized, and has a cheek cowled cowling. I am trying to find an engine that will allow me to conceal its muffler inside the cheeks, so i believe it needs a rear exhaust. Are there any engines out there that have a variable exhaust system?

[proptop]

A 4 stroke would allow you to run a much less obvious exhaust system...compared to a 2 stroke that is.

You could also fabricate a header or use a flex pipe header, so you could have a system that would be relatively clean aerodynamically and in appearance. (just a thought...)