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Yaw control in a tandem rotor helo?
Richard Riley wrote:
I've been working with a conventionally configured helicopter for a few months and this suddenly started eating my brain. In a 2 rotor helicopter you are countering the torque of one rotor with the other rotor. But how do you do a pedal turn? In a coaxial I'd think you'd increase the pitch of once set of blades and decrease the other. But what do you do in a tandem, like a CH-46? Increase the pitch, you get more torque, but you also get more lift, so the aircraft would move forward or backward - Any helo pilots out there that can set me straight? I have no clue if I am right but I always thought that stepping on the pedals would be similar to a situation where you had a stick for each rotor and moved them in equal and opposite directions. How that is done mechanically I don't even want to think about. -- Chris W KE5GIX "Protect your digital freedom and privacy, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm" Gift Giving Made Easy Get the gifts you want & give the gifts they want One stop wish list for any gift, from anywhere, for any occasion! http://thewishzone.com |
#2
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Yaw control in a tandem rotor helo?
"Chris W" wrote I have no clue if I am right but I always thought that stepping on the pedals would be similar to a situation where you had a stick for each rotor and moved them in equal and opposite directions. How that is done mechanically I don't even want to think about. I don't think so. Banking a chopper with a stick tilts the mast because of the offset of thrust on the one side. That causes the turn. To do so in opposite directions with a tandem rotor would only try to twist the fuselage, and not end up with any bank to cause a turn, assuming the you don't twist the fuselage in two. g -- Jim in NC |
#3
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Yaw control in a tandem rotor helo?
Morgans wrote: "Chris W" wrote I have no clue if I am right but I always thought that stepping on the pedals would be similar to a situation where you had a stick for each rotor and moved them in equal and opposite directions. How that is done mechanically I don't even want to think about. I don't think so. Banking a chopper with a stick tilts the mast because of the offset of thrust on the one side. That causes the turn. To do so in opposite directions with a tandem rotor would only try to twist the fuselage, and not end up with any bank to cause a turn, assuming the you don't twist the fuselage in two. g It also causes the vehicle to yaw into the turn. I still remember my instructor yelling at me to press the outside peddle (quiet odd for a fixed wing pilot to do in a turn). -robert |
#4
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Yaw control in a tandem rotor helo?
"Robert M. Gary" wrote It also causes the vehicle to yaw into the turn. I still remember my instructor yelling at me to press the outside peddle (quiet odd for a fixed wing pilot to do in a turn). I thought we were talking about tandem rotor choppers, and how they managed to do things like rotate (change direction they are pointed) in a hover. No? -- Jim in NC |
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