RAH-66 Comanche

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She lost to the Apache. But many of the concepts are being applied today in Sikorsky's attempt to exceed 260kts in the X2..
 

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I've often wondered what could have happened to Boeing's 360 if it made it into production.
 

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She lost to the Apache. But many of the concepts are being applied today in Sikorsky's attempt to exceed 260kts in the X2..
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Weird, two lift rotors and and push one, and why it needs a compensation one ?

Usually the helicopters with double rotors hare counterrotative propellers so avoing the compensation in the tail.
 
CharlesBronson said:
Weird, two lift rotors and and push one, and why it needs a compensation one ?

Usually the helicopters with double rotors hare counterrotative propellers so avoing the compensation in the tail.
Click to expand...

With the MV-22 yaw is acheived through differential longitudinal cyclic. I would think the CH-46 or CH-47 acheives yaw through differential lateral cyclic. This is possible since the rotors are on different shafts. If they are on the same shaft, I don't think this would be possible, hence the tailrotor.
 
CharlesBronson said:
Weird, two lift rotors and and push one, and why it needs a compensation one ?

Usually the helicopters with double rotors hare counterrotative propellers so avoing the compensation in the tail.
Click to expand...


Not sure I understand your question CB. The Cheyenne had a single main rotor, a tail rotor to counteract torque and a push rotor for speed.

The Sikorsky X2 is two counter-rotating main rotors (thus no tail rotor for torque) and a push rotor for speed.

Did I miss something?
 

Disregard my last. I see it was a pusher prop, not a tailrotor. So, how would the X2 generate a yawing moment with two rotors on a single shaft?
 
mkloby said:
Disregard my last. I see it was a pusher prop, not a tailrotor. So, how would the X2 generate a yawing moment with two rotors on a single shaft?
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Vary application of torque between the two rotors. Yaw is induced relative to the direction of most torque.

Kloby I meant to ask you and have been forgetting. What are the cockpit control layout for the MV-22? Are the flight controls modeled after airplanes that have STOVL capability? Or helicopters with cyclic and collective? I am guessing the prior, but have never seen pics.
 
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