Basic gyroscope question about replacing the flywheel with balanced masses

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    Flywheel Gyroscope
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Discussion Overview

The discussion centers around the question of whether a pair of balanced weights connected rigidly about the spin axis can function similarly to a standard gyroscope with a flywheel. The scope includes theoretical considerations of gyroscopic behavior and dynamics.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants propose that balanced weights could operate similarly to a gyroscope, inviting thoughts on the comparison.
  • One participant suggests that a helicopter with a two-bladed rotor might serve as an analogous example to the balanced weights, indicating a potential connection to gyroscopic effects.
  • Another participant notes that a solid disk or multiple weights have consistent moments of inertia about axes through the center, while a pair of weights exhibits a significant difference in moment of inertia depending on the axis, raising questions about the importance of this difference in the context of the rotating system's dynamics.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are multiple competing views regarding the behavior of balanced weights compared to a standard gyroscope.

Contextual Notes

The discussion highlights potential limitations related to the dynamics of the complete rotating system and the influence of rotation speed, which remain unresolved.

mesa
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Would a pair of balanced weights connected rigidly about the spin axis operate in the same manner as a standard gyroscope with a flywheel?
 
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mesa said:
Would a pair of balanced weights connected rigidly about the spin axis operate in the same manner as a standard gyroscope with a flywheel?

What are your thougts on this?
 
You could consider a helicopter with a 2 bladed rotor to be similar to your balanced weight example, and you could do a web search for helicopter and gyroscopic effects on the rotor.
 
A solid disk, or a set of 3 or more weights/blades/whatever, has the same moment of inertia about every axis through the center of the disk. A pair weights has a large moment of inertia about one axis, and a small one about the perpendicular axis.

That difference may or may not be important, depending on the dynamics of the complete rotating system and its rotation speed.
 

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