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Aviation History
1934
1934 - 1178.PDF
TI8O FLIGHT, NOVEMBER 8,. 1934, COMMERCIAL ^AIRLINES —— VIATION THIRD IN THE SPEED RACE Another Interesting American Commercial Type Described—the Boeing 247-D. This is an Improved Version of the 247, a Fleet of which were Delivered to United Air Lines last year SIXTY Boeing 247 ten-passengermonoplanes were delivered toUnited Air Lines during 1933. On being put into service, these machines cut existing times on the coast-to-coast, Pacific coast and other routes of that company by roughly one-third. After completing this batch of 347 's the Boeing Company proceeded with work on seventeen machines of similar basic design, but incorporating a number of important improvements, and known as model 247-D. Three- were shipped to Germany for Deutsche Luft Hansa, another was flown bv (Above) An impressive viewof the latest Boeing. N.A.C.A. cowlings have re-placed the short - chord cowlings fitted to the 247and three-bladed Hamilton- Standard airscrews are used. (Left) The control cabin ofthe 247-D, showing the mounting of the wirelessaerial, the normal screen and the sliding side window. Roscoe Turner and Clyde Pangborn in the MacRobertson Speed Race, and finished third, ten have just been de- livered to United Air Lines, and the remaining three are due for completion this month. During tests the 247-D showed substantial increases in speed, range, ceiling, rate of climb, and in performanct- 011 a single engine, when compared with its predecessor. Because of the high strength factors of the 247 the new type has been licensed for a gross weight of 13,650 lb., of which the payload, including the passengers, baggage and cargo, accounts for 2,582 lb. Two geared and supercharged Pratt and Whitney "H " series "Wasp" nine-cylinder radial engines, operating in N.A.C.A. type cowlings, and driving three-bladed Hamilton Standard controllable-pitch airscrews, are now fitted. On the original 247's direct drive "Wasps," short-chord cow- lings, and two-bladed " controllables " were used. The in- stallation of the new power plants was the chief factor contributing to the greatly improved performance when flying on only one engine. In this condition the ceiling is 11,500 feet, or 6,500 feet better than that of the 247. BOEING 247-D Two Pratt and Whitney "Wasp " SIHI-G (550 b.p. at 2,200 r.p.m. at 8,000 ft.) DIMENSIONS. Span... .' ;.. . .,;. . 74 ft. (22,6 m) Length 51 ft. 4 in. (16,25 m) Wing Area 836.13 sq. ft. (77 fi m2) WEIGHTS. Weight emply ... 8,'J40 lb. (i 055 kg) Useful load ..."„.. 4,710 1b. (J 13G kg) PKKKOKMANCE. Top speed at 8,000ft. (2438 m) 200ra.p.h. (321 km'Ji) Cruising speed at 12,000 ft. (3 65S m) ... ... 189m.p.h. (304 Am/*) Cruising speed at 8,000 ft. (2 fflin] 180 m.p.h. (290 ktn/h) Landingspeed 02 m.p.h. [100 km'h) Climb to 11,000 ft. (3 363 HI) lOmins. Takeoff run 925 ft. [350 m) Range at 75% h.p 800 miles (1 2S7 km) Range at 02.5% h.p 000 miles (I 448 fcm* Absolute ceiling 27,200ft. (S 230 m) Absolute ceiling on one engine 11,500 ft. (3 353 m)
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