The 1/3rd scale Pitts is not a very big model. I used to have a Byron's third scale, and it flew well on a Moki 180. Why does everyone want to grossly overpower their models? A 50cc engine on this model would be like putting a Hemi Chrysler in a Crosley. It could be done, but for what reason? Several have built the Pitts Bulldog in third scale, and have used the G-62 and other similar sized engines. As far as I'm concerned, they are still packing too much motor. Just my opinion.

Bill, AMA 4720
WACO Brotherhood #1