- Nov 23, 2010
- very low low low earth orbit
It does precess 90°. See post #15.
There is no way to take the weight away.Take that weight away, do they(the blades alone) actually cause precession?
Yup, to go straight ahead in my airplane takes left rudder when pulling and right rudder when pushing. Flat spins are either stick back left rudder full power, or stick forward right rudder full power. That big aluminum propeller generated lots of gyroscopic forces.All rotating masses will want to precess. An airplane's propeller will cause precession; you can feel it in a steep turn. It takes more elevator back pressure in a right steep turn than in a left, because the prop pulls the nose down in the right turn and pulls it up in the left. Turning right, you are pushing on the left side of the prop disc, which makes the prop want to angle down, not right. The opposite is true in the left turn. A taildragger pilot can feel it when raises the tail in the takeoff run; the nose will pull left a bit harder while the tail is coming up.
Gyroscopes have their mass concentrated in the rim. That makes it most efficient for the weight of it.
Most today gyro head rotors are similar to those find in helicopters with swashplates etc. In those machines your theory applies.When the gimbal is tilted, the orientation of the rotating rotor is NOT changed (only the blade angles at certain position is). This is important, otherwise the gyro cannot be controlled due to precession.
In essence the guy in the video has control of the mast in the sketch.. whatever angle you move the mast to, the rotor disk will fly until it has reached a new plane that is square to the mast.. the rotor disk adjusts it's plane via cyclic pitch of the rotor blades and precession, but the one holding the mast is isolated from the gyroscopic forces via the hinge. the only force you feel in the mast is the force it takes to change the aoa of the blades.