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Sperry vertical gyro for Boeing 747

3/3/2009 05:00 AM EST
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MikeLC
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re: Sperry vertical gyro for Boeing 747
MikeLC   8/1/2010 6:07:35 AM
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Yes, David, this is some excellent craftmanship and I learned something from your dissection of the device. Very cool machine. So, what does MEMS-based mean?

todd_blackmon
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re: Sperry vertical gyro for Boeing 747
todd_blackmon   5/2/2009 3:55:31 PM
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In case it helps, I'm not familiar with this particular gyro, but generally gyros don't measure angular displacement. They measure angular rate. So, I would expect the coils to work like a generator to measure rotation rate.

Nicabod
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re: Sperry vertical gyro for Boeing 747
Nicabod   3/20/2009 2:43:10 PM
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Golly! That was a real treat. Those rotary contacts have been called slip rings for about a century; they have been used since before 1900 on rotating electrical machinery, although these carry low currents, have light force, and a small diameter to minimize friction. I was a Navy fire control tech back around 1956, when the ship's vertical gyro was called a "stable element"; it weighed a few hundred pounds, stood elbow high on the deck, and was almost 3 feet square. The angle sensors ("gimbal sense coils") are probably synchros, and if so, they don't use differential circuitry. Omitted from the teardown description is an interesting mechanism. Something senses gravity, and applies torque to the gyro to make it precess until its spin axis is vertical. I don't know how modern vertical gyros work, however. I can't tell from the photos whether opposite each synchro[?] is a torquer, a limited-travel torque motor, but that's believable; such torquers would indirectly erect the gyro's spin axis to the vertical. Unrelated to this are superb teardowns (and rebuilds!) of mechanical calculators by a retired Australian engineer named John Wolff. He has a Web site, and they are fascinating. Many thanks.

DPD
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re: Sperry vertical gyro for Boeing 747
DPD   3/19/2009 4:30:58 PM
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Looks very much like the Litton packs that we used once, thanks for bringing the memories back. Doug Dickinson Cadastral Electronics Shop USDI BLM

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