RE: Carden 30% CAP and a DA 50?
Scott, I am flying a 30% Carden Cap. I have a 3W-75us single on mine and it is way more than enough. It is not even broke in and it yanks that cap around with authority.
The best part is the motor costs about the same as the high end 50cc motors. I think it sells for about $550 at aircraft international.
You could build the Cap and stay in a 50 size budget. Only 6 servos are required.
Jess