Ka-50 - question about Yaw

[hreich]

Can somebody pls explain, how coaxial rotor design enables yawing to left or right - since there is no tail rotor?

[Doggy]

http://forums.eagle.ru/showthread.php?t=29317 ;)

[hreich]

Thx

[airea]

One of the rotors rotating clockwise, while the other is rotating counterclockwise and they balance each other in straight flight. That is, they neutralize each other's torque in straight flight. If you want the chopper to yaw, you simply increase the torque of one rotor, while keeping the other unchanged. Or you decrease the torque while keeping the other same...

[britgliderpilot]

One of the rotors rotating clockwise, while the other is rotating counterclockwise and they balance each other in straight flight. That is, they neutralize each other's torque in straight flight. If you want the chopper to yaw, you simply increase the torque of one rotor, while keeping the other unchanged. Or you decrease the torque while keeping the other same...

 

Not strictly true - as the link should explain.

 

You increase torque by increasing the pitch of one rotor disc - if the other remains unchanged then there would be an undesirable control coupling whereby lift would vary with rudder application.

 

If you balance them properly, you can cut out the lift change and create a greater torque imbalance (faster yaw rate) by increasing rotor pitch on one disc while decreasing it on the other. I understand this is that the Kamov system does.