It would help to know the manufacturer and then go here:
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or here
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DonMy boys took a Citabria in on a trade,
> I'm not sure of the manufactory, it has
> 69" wing span. The only rx I have available
> is a 4 channel Futaba with FP-s48 servos
> the plane had 2 aileron servos would it be
> possible to mount 1 servo. I'm not sure
> if the FP-S48 servo would have enough strength
> to operate the flaps.
>