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Aviation History
1938
1938 - 1778.PDF
FLIGHT. JUNE 23, 1938. PRINCIPAL DATA. Capacity 18.372 litres. Dry Weight International rating Take-off power 1,058 1b.405/420 h.p. at 2,400 r.p.m. and 7,500 ft.505 525 h.p. at 2,600 r.p.m. STAQXEa DRIVING SEAB STARTEft.ENGAGEMENT LEVER SUPERCHARGER.DftlVINJG GEAQ.S BREATHED. TWIN ;ARBUPETTOR WITHAUTOMATIC MIXTURECONTROL OIL SUMPCONTAINING FIL.TEO.S radius ot the airscrew and are claimed to have a negligible effect on the lift and drag of the wing. As the Gipsy Twelve is among the first engines in this country to make use of the De Havilland constant-speed airscrew it may be advantageous to explain that the fine- pitch limit of this device may be set to allow full r.p.m. and full power in the static condition at the start of the take-off run, the pitch automatically adjusting itself to permit the engine to maintain full power throughout take- off and the initial climb to i.oooft. The fine-pitch setting at the beginning of the take-off enables the airscrew to convert the power more efficiently into thrust. To TORSION DRIVE SHAFTEXTENDING FPOM AIRSCREW SHAFT TO SUPERCHAR6ER SEARS summarise the advantages of the constant-speed airscrew, it automatically adjusts its pitch, ensuring that the engine is operating at its most efficient speed under all conditions and in all attitudes. Not only has the engine passed its fifty-hour civil type test, but it was subjected to the one hundred-hour test in the military category with excellent results. As a matter of interest, the former test was composed of the follow- ing runs: 20 hours under maximum cruising conditions on the brake, giving 348 h.p. at 2,200 r.p.m. at —fib. boost; 10 hours under similar conditions but driving a constant-speed airscrew ; 10 hours under climbing condi- tions with airscrew (390 h.p. at 2,400 r.p.m. and zero boost); 1 hour ditto on the brake; 5 hours under maxi-
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