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## The Gyroscope Forum

19 August 2019 09:40

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Subject: The Five Motions of a Gravity Powered Overhung Gyroscope Precessing at Steady State
Question: The five motions are as follows:
1) RPM of gyro wheel (how fast it is spinning).
2) Horizontal ORBITAL motion of gyro wheel around the pivot. This is NOT the same thing as precession.
3) Precession motion around an axis that runs vertically through the center of the gyro wheel. This vertical axis is moving in a circle around the pivot as the gyro wheel orbits around the pivot. The gyro wheel precesses once around this axis every orbit.
4) Precession motion around an axis that runs horizontally through the center of the gyro wheel. This motion happens as the gyro droops.
5) Vertical ORBITAL motion of the gyro wheel around the pivot. This motion happens as the gyro droops and normally can only progress until the gyro wheel touches down on the surface supporting the pivot.

Motions 2 &3 are locked together and happen at the same rate. Motions 4 & 5 are also locked together and happen at the same rate. Motions 1, 2 & 3 are usually the quickest. Motions 4 & 5 are usually very slow.

Motions 2 & 3 provide one of the more interesting effects of a precessing gyro. The combination of motions 2 & 3 are why the arm stays on the pivot and theoretically provides little if any horizontal force during precession. Motion 2 is constantly trying to move the arm away from the pivot in a forward direction (same direction as the gyro wheel is orbiting) as was proved in the tree house experiment that I performed when the giant gyro was released. Motion 3 is constantly trying to move the arm away from the pivot in a backward direction (opposite direction that the gyro wheel is orbiting. These two motions happen at the same time and at the same rate so the pivot end of the arm stays right on top of the pivot.

Blaze

Date: 4 July 2012
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Answer: Harry K. - 05/07/2012 18:05:12
...and what are you conclusions?
Which movements are the cause and which movements the effect?
And why?
I know the answer, you too?

Best,
Harry

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