RE: What prop size for .15 Sport UC plnes?
There is a review of the Cheetah, Lynx, and Jaguar in the reviews posted by Downunder. They seem to run in the 7,000 more or less RPM range. i was flying my Cheetah on a Ron Prentice Big Fry, and tried various props. I am building another airplane for it, one more streamlined than the Big Fry. It is a favorite engine, one flip starts, and runs without change through maneuvers.