yea - probably 3 (canard, 2xaileron). The rudders would be tough to get a servo in the wing out that far without complicating things with bellcranks. Another forum member had built one several years back without rudders and it looked to work out well... https://forum.flitetest.com/index.php?threads/ftfc18-wwii-curtiss-wright-xp-55-ascender.36123/
Flaps would be interesting as well (I'm on a flap kick lately
)
Flaps would be interesting as well (I'm on a flap kick lately