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#20
April 9th 07, 05:54 PM
posted to rec.aviation.piloting,rec.aviation.student
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Rationale behind vacuum instruments
On Apr 9, 10:40 am, "Snowbird" wrote:
"Mxsmanic" wrote ... Can someone tell me why vacuum power is popular for certain instruments? Historical. Aircraft electrics tended to be a) more unreliable than today and b) add unnecessary weight. Of course, one shouldn't forget that a usable vacuum "supply" was available without a pump when an external venturi was installed. 
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