Fastest Transport

In sending specifications to airlines for its new four-engine jet transport. Boeing Airplane Co. last week disclosed derails of the new plane. The first U.S. entry into the field of jet passenger liners, Boeing's 707 will be the world's fastest and most powerful transport, with a cruising speed of well over 500 m.p.h. v. about 500 m.p.h. for the Comet III, Britain's most advanced passenger jet. It will carry from 60 to 120 passengers, depending on airline requirements.

The 707, scheduled for its first flight next summer, will be powered by four Pratt & Whitney J57 engines, rated at more than 10,000 Ibs. thrust v. 9,000 Ibs. thrust for Comet III engines. Payload of the new plane is put at 25,000 Ibs.. an increase of a third over the 18.750-lb. payload for Boeing's piston-engine Stratocruiser. The new jet transport will have wings swept back at the same angle as the B-47 and B-52 bombers. Cost of the new transport: an estimated $2,500,000 to $4,000,000.

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