ORIGINAL: Redrata
I think you will not have the proper snap rate with two servos only. I use 4 standard and it rolls pretty nice, it is also faster at the field this way.
I'm thinking either (4) HS-5475HB or (2) HS-5625MG digital servos for the wings.
(I really like the Hitec line of digital servos)
Either setup should be fine on torque.
The ailerons are pretty small, and I figure Vne at no more than 70mph.
I don't think non metal gear servos (Karbonite) would be a problem in this application.
(I'm using a 40cc gas engine)
The 5475 is a little slower (even on 5 cells) but I can live with that.
I figure the two-servo option willl save 2-3 ounces.
But maybe that is the price to pay for simpler engineering and quicker assembly at the field.
I guess I'm starting to flip-flop back to the 4-servo option.
