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The Art of the Helicopter John Watkinson - Karatunov.net

The Art of the Helicopter John Watkinson - Karatunov.net

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Engines and transmissions 241<br />

Fig. 6.32 At (a)<strong>the</strong> conventional gear tooth is convex and has a small contact patch. At (b)<strong>the</strong> conformal<br />

gear has one wheel with concave teeth and one with convex teeth. This increases contact area and reduces <strong>the</strong><br />

distortion <strong>of</strong> <strong>the</strong> tooth allowing higher loading.<br />

Fig. 6.33 <strong>The</strong> epicyclic or pla<strong>net</strong>ary gearbox <strong>of</strong> a Chinook, showing <strong>the</strong> outer ring gear.

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