roofer...................i put the saito 3 cylinder radial into the camel. i used a ringed muffler and it fit perfect. i was dissapointed with the power out of the engine. had to fly at full throttle. engine may have been overheatng. may have to open cowel some. wish that all the comments about ground handling had been made before i bought it. as usual early reports are allways overly optomistic