Hello 3010charles,
Did you have a look at the picture (and engine) of my Rascal, as found on:
http://www.rcgroups.com/forums/showt...=6#post8357035
The RotoMotor engine is compact, powerful, extremly reliable and well-suited as powerhouse for a Rascal 110. An tuned-pipe is used from Krummscheid, it's mounted inside the fuselage.
Regards.