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Aviation History
1948
1948 - 0803.PDF
Flight, June 3rd, 194S PROPELLER 193 5 R O G R E S S The larger of these two propellers (indicated in white) was designed in 1935 to absorb 910 horse-power. Superimposed upon it is the directly comparable 1,000 horse-power Hydromatic propeller of to-day, suitable for piston or turbine application. In thirteen years the weight has been reduced by 37 per cent-and the hub frontal area by 43 per cent, while a two-pitch mechanism of 20 degrees' range has given place to constant-speed, feathering and braking operation with a pitch range of 120 degrees. From current development in materials, in blade form and in refine- ments of actuation, equally valuable progress may be expected in the next decade D E H A V I L L A N D R O R
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