WITH aeroplanes becoming daily more and more complex designers are finding it increasingly convenient to leave the detail planning of certain units to specialists in their design and production. It is, after all, an extremely logical development and nowhere has it found so much outlet as with the complicated details of hydraulically operated parts. Generally speaking the modern high‐performance aeroplane as three main uses for hydraulics, undercarriage traction, flap operation and airscrew control—the atter in single‐engined machines is usually a direct engine operation, but in a multi‐engined aircraft it advisable to have a separate unit controlling and synchronising all the airscrews.
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