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Old 03-22-2009, 09:11 PM   #8 (permalink)
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Join Date: May 2008

Popsicle's reply isn't quite on the mark - the flybar doesn't provide any stability whatsoever, what it does is to reduce the response rate of the rotor disc to the pilots inputs.
Look at this analogy - if you place a 6-foot long pole vertically on the palm of your hand, you can balance it upright quite easily. this is because it "falls over" more slowly than you are able to respond to, or "chase", its movement.
Now try the same thing with a 6-inch pencil - it "falls over" much more quickly - too quickly for your human responses, and thus you can't keep it balanced.
This size analogy holds true for rotors directly connected to the swash - the smaller the rotor, the quicker it responds, until a point is reached where it is too quick for the human pilot to respond to or "chase".
The flybar system is actually a method of controlling the main rotor via a slower responding system which has a "chase rate" slow enough for the human pilot to anticipate - typically half a second or so, which can be changed, for example, by adding weights to the flybar to reduce the response or chase rate, (which incidentally has no effect on the stability of the system, but simply makes it easier for the pilot to follow), or by shortening the flybar or using bigger or lighter paddles to increase or speed up the chase rate
Hope this helps you to understand what the flybar does.
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