RE: Great Planes Extra 300 GP/EP
I am flying a 55AX in a Funtana X 50. I broke in the motor with an 11x8 APC for 11 flights, then switched to a MAS 13x4. GREAT FLYING for aerobatics & 3D! Hovers this HEAVY airframe really well. I had a 55AX in my GP Extra 300S and it flew it well.