That would depend on how you want to fly it. I've seen one fly with an LA, rather sluggish but real scale I would assume (never flown a full scale one ). It had a bit of difficulty in medium-high winds.

My buddy has a .46 fx, flies it half throttle or so but it has the pickup he needs against the wind; Cub's like to float.

Mrs. Nuker is putting a Saito .56 in hers,,,,just because.

Nuker