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Aviation History
1934
1934 - 1048.PDF
1050 FLIGHT. OCTOBER II, 1934. ENGINES IN THE ,; ENGLAND—AUSTRALIA RACE (Continued from p. 1021) This week ive deal with engines of foreign manufacture. The preponderance of American radials is not tu be won- dered at, for Uie majority of these engines have been developed for opera- tion in low-drag coivlings on fuel of lugi: octane value, making them attractive propositions for msltj.Hatioit lit racing aircraft. U.S.A. The Pratt & Whitney Aircraft CompanyT HERE are more engines of this company's manufacture in the race than of any other make. The famous " Wasp " seems to be tlu- most popular type. " Wasps " of various patterns have been installed in a very large number of record-breaking aircraft for several years past, and to-day art* widely used in high-performance military and civil machines throughout the world. Fokkers operating on the K.L.M. Amster- dam-Batavia route are powered with " Wasps," and have acquired an envi- able reputation for reliability. The " Wasp " is a nine-cylinder air- cooled radial of typical American ap- pearance. Various types are being employed in the England-Australia racers, namely, the S1D1, SCi, S1H1-G, and SiE. All engines in the "Wasp" series have a bore and stroke of 5|in., and weigh approximately 7501b. The S1D1 is rated at 550 h.p. at 2,200 r.p.in. at 5,000ft. Compression ratio is 6:1, blower ratio IO:I, and fuel con- sumption 0.481b. per b.h.p./hr. at ciuis- ing speed. Rated at 450 h.p. at 2,100 r.p.m. at 6,000ft., the model SCi has a compression ratio of 4 :i and a blower ratio of 10:1. Most modern of all the " Wasps" is the SiHr-G, two of which type are installed in Col. Roscoe Turner's Boeing 247-D. This is a new geared and supercharged engine rated at 550 h.p. at 2,200 r.p.m., with a 6.5:1 compression ratio, 12 :T supercharger drive, pnd '^.2 » WASPS " : The SIHI-G as installed in Col. Roscoe Turner's Boeing, and (right), the standard "Wasp" series D and E used by numerous competitors. airscrew reduction gear. Lt. Murray B. Dilley's long-range "flying wing" Vance " Viking " has a " Was]) " SiE, giving 550 h.p. at 2,200 r.p.m. at 9,000ft. Fuel consumption is given as 0.551b. per b.h.p./hr. at full throtUe. The "Wasp" in Wiley Post's Lockheed " Vega " is a special type, virtually a modified " Wasp " C provided with auxiliary superchargers. On the official entry form for the race the power of this engine is given as 350 h.p. at 36,000ft. A description of the supercharging system was given in Flight of August 16. A Pratt & Whitney "Hornet" engine is being used in the Northrop " Delta" No. 22. Essentially an en- larged " Wasp," the " Hornet " has a displacement of 1,690 cubic inches, while that of the " Wasp " is only 1,344 cubic inches. The "Delta " uses a " Hornet " SDi giving 600 h.p. at 2,050 r.p.m. at 2,500ft. and consuming fuel at the rate of 0.481b. per b.h.p./hr. The compres- sion ratio is 5:1 and the supercharger ratio 8:1. Four '' Hornets '' power the big Sikorsky S.42 flying boat which re- cently broke several world's records. Installed in the Keith Rider R-3 No. o is a Pratt & Whitney "Wasp Junior" which, as the name denotes, is a '' scaled down '' version of the " Wasp." The displacement is 985 cubic inches, the supercharger drive 11 :i, and the power 375 h.p. at 2,300 r.p.m. at 7,000ft. At full throttle the fuel consumption is 0.551b. per b.h.p./hr., and the oil consumption 0.35ID. per b.h.p./hr. Most powerful and interesting of the Pratt & Whitney engines in the race is the new "Twin Wasp Junior" installed in Col. Fitzmaurice's Bellanca mono- plane Irish Swoop. This is a 14- PRATT & WHITNEY RADIALS. "Wasp Junior," "Hornet," and "Twin Wasp Junior." The latter is cne of the most modern engines in the race and is used in the Bellanca Irish Swoop
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