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#9
January 9th 05, 12:48 AM
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UltraJohn wrote:
nafod40 wrote: Jim Carriere wrote: This is one of those questions where there must be a simple answer. This is probably the forum to get the best explanation. Why aren't vacuum driven gyro instruments driven by pressure instead? Some systems ARE designed to work off of pressure. Depending on the system designer. Hmm, I learn something new every day. I figured maybe there was some technical reason they had to use vacuum, since most of the instruments one can buy seem to be either electrical or vacuum. From your answer, I suppose there is no real reason, maybe most of the non electrical ones are vacuum because that is just the way things are. 
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