Ya know...this 58 engine would probably be real sweet on the 3Dhobbies 89" Slick I've got a 33% Extra 330L, and though the 58 has proven to be tough for its displacement, I can't imagine enjoying it for 3D flying at all with that engine installed. Now, if you could get a 33%er on a weight loss program, and get it in under 20lbs, you'd have lots of wing area, and probably a damn nice flying plane with that engine. Take a look at the Slick, see what you think.