Question by lmf7000: How do coaxial helicopters get rudder control?
On normal helicopters, rudder control during hover is done with the tail rotor, but coaxial helicopters don't need/have a tail rotor, so how do they make it yaw?
P.S. I'm talking about a real full-size helicopter, not a radio controlled one!
Answer by SomeGuyRandomWeirdo
The rotors are turned in different directions which cancel the affects that are normal surpressed by a tail rotor.
They can yaw by changing the speed and/or pitch of the blades.
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Just like a conventional helicopter, they can vary the pitch of the blades. By making one rotor higher pitch than the other, the aircraft will turn one way or the other. Some make use of control surfaces while in forward flight in addition to using the rotors.
A coaxial-rotor helicopter uses conventional rudders to control yaw. In the hover, the rudder diverts a portion of the rotor wash (the wind created by the rotor blades) to control yaw; In forward flight it directs relative wind to the same effect.
with a stabilizer fin…. look at some pics online…….