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Aviation History
1938
1938 - 0091.PDF
LLAND TCH AIRSCREWS Thousands of de Havilland controllables have gone into service from the where they are made at Edgware, Middlesex, England—Relieved to be the largest c.p. airscrew plant in the world. Some forty different aircraft types have been equipped. Controllable-pitch airscrews of this fundamentally robust and simple hydraulic type have been specified by practically all the major air-line undertakings of the "world, and in the five years since their commercial introduction have established an eminence entirely unapproached for their high reliability, long life and ease of maintenance. Several standard installations in public-transport aircraft have been approved for service up to 4,000 hours, with overhauls every 400—500 hours. The series of de Havillftnd controllables•—all available for constant-speed operation.—covers the entire range of current and prospective power units. ize 4000 Two-blade. Up to 550 h.p. Max. diam. 10ft. 9in. Size 3000 Up to 550 h.p. Max. diam. : 9ft. 6in. Size Up Ma 2000 to 375 x. diam. h.p. 9ft. Size 1000 Up to 250 h.p Max. diam. : 7ft. 6in. LD. HA AFROnROMF HFRTFORHSHTRF F XT r: T A M IV
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