MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 44
Limitations of the Directional Gyro. The gyro re-quires 3 inches of mercury vacuum to operate. Itshould not be used for take-off until it has run for 5minutes. This time is required to get up to operatingspeed. (If the gyro is operated by a venturi tube insteadof a vacuimi pump, it cannot be used… … Fig. G. Sperry Gyrosyn Compass. The Gyrosyn Compass The GYROSYN COMPASS combines the functionsof both the Directional Gyro and the MagneticCompass. It provides stable compass headings in rough air. It is north-seeking like a Magnetic Compass, but isfree from northerly turning error and oscillation.…
Airplanes
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