I got my 4 star 3rd hand with a fox 40 sport on it. It really flew good and had plenty of power,started and throttled great. Having a light engine really helped the flying characteristics. I sold it after flying it for years with the engine on it and the guy who bought it is still flying it 3 years later. That 4star and fox 40 must have flown around the world a couple times by now! It is around 12 years old. The fox 40 sport is made in a 30 size case and is virtually indestructable(needs castor in the fuel). It is also on sale at Sheldon's for 54.99$. The 4star was designed for 4 size four strokes.

http://www.sheldonshobbies.com/listing/airhd01.html