I have a FOX 0.7 that I have not run yet. I also have two FOX 0.7 Rc and have one in a Junior Falcon with Galloping Ghost radio. I have not flown it yet because I cannot get the throttle to work properly. [Not the engines fault] When I do fly it I may convert it to three channel with servos for more reliable control. I have flown the same setup ine a Jr. Falcon in the late 60,s.
I believe that I read once that the small FOX engines could use a longer prop because they were long stroke.
John Smith