RV, that Webra sounds awesome. My OS 50 seems to be running better and with a 13X4 APC .It seems to have the right kind of power for the plane. Its a great plane - very smooth flying and yet highly aerobatic. Snap rolls are extreme and she spins nice and flat. Landings can be as slow as you like - my last was a full stall 3 pointer at walking pace with no tip stall tendencies. I have removed all lead from the nose and she really floats in now.