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29 November 2024 03:49
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Question |
| Asked by: |
Spencer Stock |
| Subject: |
energy |
| Question: |
An acquaintance built a device with a small hand spun giro inside a larger giro. Both supported on gimbals. If you spun them both in the same direction nothing much happened, but if you spun them in opposite directions the outer giro came to an almost instant stop. The inner one carried on spinning. Neither of us could work out where the energy came from to stop the outer giro in its tracks. I wondered if you might have any thoughts. |
| Date: |
16 February 2007
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Answers (Ordered by Date)
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| Answer: |
Tom Schum - 21/07/2007 21:15:31
| | | This is very interesting.
Do you have a photo of the device?
I found out that if you spin up a regular gyro clockwise, so its shaft is vertical, and then try to rotate the mounting (has the shaft bearings in it) counterclockwise also on the same vertical as the shaft, the gyro first has to flip over.
On the other hand, if you have a gyro rotating clockwise and try to rotate the mount clockwise also, the gyro will just wobble a little instead of flipping over. You can rotate the mount clockwise as fast as you want, no problem. As soon as you reverse, however, the gyro will flip.
Most gyros are not marked so you can tell which side is clockwise and which side is counterclockwise, so you will have to mark your gyro. One of my gyros has a brass flywheel, so I marked one side blue with a sharpie marker.
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