Function of the Flybar Paddles
05-19-2003 | 03:10 PM
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From: Livonia, MI
Function of the Flybar Paddles
What is the function of the flybar paddles? I have a pretty good 'basic' understanding of how the rotor head works (or so I thought!) but don't understand their use.
I understand that collective inputs increase the angle of attack of all the main blades. I know that cyclic tilts the swashplate so that only during a certain portion of the rotation the blade AOA increases. And I assume since the swashplate is tilted, that on the opposite side the blade with increased AOA, the blade AOA decreases.
I thought that the linkages from the swashplate should simply go to the main blades, but it looks like (from studying the Raptor 30 manual online) that the linkages go to the flybar. Do you control the flybar, and it then in turn conrols the main blades?
How does gyroscopic precession factor in to all this? I thought that you had to input forces 90 degrees of rotation away from the desired result... i.e. to roll the aircraft you have to input a force at the front or rear.
Ok, enough questions for one post.
I understand that collective inputs increase the angle of attack of all the main blades. I know that cyclic tilts the swashplate so that only during a certain portion of the rotation the blade AOA increases. And I assume since the swashplate is tilted, that on the opposite side the blade with increased AOA, the blade AOA decreases.
I thought that the linkages from the swashplate should simply go to the main blades, but it looks like (from studying the Raptor 30 manual online) that the linkages go to the flybar. Do you control the flybar, and it then in turn conrols the main blades?
How does gyroscopic precession factor in to all this? I thought that you had to input forces 90 degrees of rotation away from the desired result... i.e. to roll the aircraft you have to input a force at the front or rear.
Ok, enough questions for one post.
05-19-2003 | 09:29 PM
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From: Tucson, AZ,
Function of the Flybar Paddles
Looks like the servos control the paddles, and the paddles control the blades. I guess the paddles are used to get mechanical advantage on the blades, so you don't have to have 1000 OZ inch servos.
05-20-2003 | 06:51 AM
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From: London,
Function of the Flybar Paddles
Wonderboy
The gyroscopic precession states that a gyroscope (such as the rotor blades) will experience an effect at 90 degrees from where the original force was exerted (as you said).
Lets say you want to fly forward, you tilt the cyclic control forward and the swashplate tilts forwards ... so far so good. According to the law of procession, in a counterclockwise rotating rotor, the rotor blades must not be at maximum pitch when they reach the tail (to lift it) but in fact 90 degrees before this point which is to the west (if nose is facing north).
So even though the swashplate tilts north, maximum pitch is achieved when the rotor blade is pointing west, which has a lifting force on the tail (which is pointing south) !!!
Very confusing, very clever
The gyroscopic precession states that a gyroscope (such as the rotor blades) will experience an effect at 90 degrees from where the original force was exerted (as you said).
Lets say you want to fly forward, you tilt the cyclic control forward and the swashplate tilts forwards ... so far so good. According to the law of procession, in a counterclockwise rotating rotor, the rotor blades must not be at maximum pitch when they reach the tail (to lift it) but in fact 90 degrees before this point which is to the west (if nose is facing north).
So even though the swashplate tilts north, maximum pitch is achieved when the rotor blade is pointing west, which has a lifting force on the tail (which is pointing south) !!!
Very confusing, very clever
