Rock I firmly agree with you on the servo size for the plane he is using. But I was thinking if he has 4 DS 821
sport digitals with 60+ at 4.8 volts, why not use them on all control surfaces and go with a lightweight mini on the
throttle. This will give the added advantage of good centering and resolution, combined with good torque.
and the Hitec HS81 will cost less than $20.