One or two flap servos?
 

Gents:
I am building a Unionville Otter, 72" span. I went with separate flaps and ailerons just to have fun with them. I am putting in separate outboard servos in the wing for the ailerons and servo(s) in the centre for the flaps. Given the span of the wing and the size of the flaps, about 1 ½" X 12", would I need one or two servos? I would be using standard Airtronics servos. I think the max size of the engine would be a 40 or 45, depending on the weight.
Many thanks for any advice.

RE: One or two flap servos?
 

A standard servo will be strong enough, but dual servos gives you a lot more options.

Take a look at the videos on this page:

Flaperons

RE: One or two flap servos?
 

If this servo is just for the flaps, a standard single servo will be just fine. I have a single servo in a Flyin' King (80" ws) powered by a Saito 91 and the single servo works great.