Craig

Its a great engine foe the right plane. They run good, but the downfall is there weight. I have a Ryobi 31 in a big Rascal 110 and that plane handles the extra weight great. However the rule of thumb is to use them in a Plane with at least 1000 sq in of wing area and the Plane should probably weigh in 12lbs or under with engine installed to have good performance. For scale flight you can get by with a little heavier plane. Big Cub like planes and other scale machines are suited best to this engine. Mine runs flawless and I also have another one waitng to go into another project. There are some websites out there like Jag engines and some others that detail the process of converting.