What is the minimum gyroscope speed to yield force precession?

[richengle]

Does anyone know what the minimum speed of a gyro to make it so a force at 0deg will yield a movement at 90deg... or even better, what the angle is wrt speed... see http://www.copters.com/aero/gyro.html for pictures.
-thx,
rich

 

[A.T.]

Summary:: min gyro speed to yield force precession

Does anyone know what the minimum speed of a gyro to make it so a force at 0deg will yield a movement at 90deg... or even better, what the angle is wrt speed... see http://www.copters.com/aero/gyro.html for pictures.

Any non zero speed will have the 90deg offset for a small input torque



While the offset is always 90 deg, the noticeably of the procession effect depends on initial angular momentum vs. input torque.

 

[richengle]

Any non zero speed will have the 90deg offset for a small input torque



While the offset is always 90 deg, the noticeably of the procession effect depends on initial angular momentum vs. input torque.

thanks, that explains a bike wheel. but i tried it with a fan, and didnt notice any precession. is it because it has less mass?

 

[A.T.]

thanks, that explains a bike wheel. but i tried it with a fan, and didnt notice any precession. is it because it has less mass?

The moment of inertia depends on the mass and its distribution. With a fan you additionally have aerodynamic effects.

 

[Lnewqban]

thanks, that explains a bike wheel. but i tried it with a fan, and didnt notice any precession. is it because it has less mass?

What kind of fan did you use?

 

[richengle]

What kind of fan did you use?

box fan