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USMCmech said:I spent a lot of time on CH-46s, the Chinoks little brother.
The flight controlls are the same in the cockpit, Cyclic, Collective, Yaw pedals.
However the systems that actually move the rotorhead work a little different. There is much less "tilt" available in the rotor head than a conventional helo. This is because the two head can work opposite each other to change direction. To pitch foward, the foward head drops collective, and the aft head rasises collective, but this is all done by the pilot pushing the cyclic foward.
On the CH-46, the ground stearing is done by tilting the forward head right or left. The CH-47 is actually a taildrager, and the same thing is done by the aft head.
Ollie said:In the 47, the pilot's inputs don't directly do anything to the rotor heads. They send signals to flight control computers that apply the inputs via a series of hydraulic actuators as they see fit to give the pilot what they think he wants. There is no direct control linkage between any of the flight controls and either of the rotor heads. Also, there is no way for the pilot to control the aircraft without hydraulic pressure.
Pitch fore and aft is based on differential collective pitch, lateral inputs cause both discs to tilt in the direction of the input while pedal inputs cause the forward disc to tilt in the direction of input and the aft disc to tilt opposite. Using a combination of pedal and lateral cyclic, the pilot can make the aircraft pivot about the forward or aft rotor head.
I guess the 47 could be called a taildragger, but it has 4 wheels. Steering is controlled by a power steering control in the cockpit. The pilot has a spring loaded knob on the console between the pilots' seats that he uses to steer left and right. The rotor heads have nothing to do with steering. The parts that acually move to steer the aircraft are hydraulic power steering actuators mounted on the aft landing gear.