Low-weight Rotary Powerplant Developed
New York—P. R. Mallory & Co. has developed and tested a rotary internal combustion engine that the company said can achieve horsepower-to-weight ratios of four or five to one. One engine, built of heavy Mallory 3 copper-chromium alloy, had a dry weight of 158 lb. and generated about 400 hp. at its design operating speed of 5,000 rpm.
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