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Aviation History
1948
1948 - 0671.PDF
HERMES IB Level speeds at 95 per cent a.u.w. (max. weak-mixture power) Speed at 12,250ft 279 m.p.h. „ sea level 239 m p.h. „ 10,000ft 270 m.p.h. Payloads and ranges at 10,000ft (max. range cruising speed) Freighter Passenger Payload for 1,000 miles 15,350 Ib 13,625 Ib 1,500 miles 13,480 Ib 11.755 Ib 2,000 miles 10,4801b 8,755 1b Climb and take-off at normal climb power (at 75,000 Ib a.u.w.) 4 engines 3 engines Sea-level rate of climb I,l84ft/min 645ft/min Rate of climb at 10,000ft 750ft/min 280ft/min Time to 10,000ft 9.8 min 20 min Ground run ... 940 yds Distance to 50ft 1,270 yds Take-off and climb speed 127 m.p.h. S.B.A.C. display at Farnborough, where it will be demon-strated. Though the Hermes IV is sufficiently large to seat 63passengers, B.O.A.C. are limiting the number of seats to 40, with a corresponding gain in comfort. A galley anddressing rooms are specified, and a cabin altitude of 8,000ft will be maintained while the aircraft is cruising at 25,000ft.B.O.A.C.'s Empire-type adjustable chairs will be installed, complete with individual lighting, book-rest tables andbuilt-in ashtrays. The type of Bristol engine intended for the Hermes IV is no ordinary Hercules. Known as theHercules 763, it will operate on 115/150 grade fuel and have a take-off rating (open exhausts, without ram) of2,210 h.p., with a boost of plus 16 lb/sq in. De Havilland reversible-pitch airscrews, which will reduce the landingrun by about 40 per cent, are specified. Another innova- tion will be a steerable nosewheel. The Hermes V, two prototypes of which have beenordered, will be generally similar to the Hermes IV, but will be fitted with Bristol Theseus airscrew-turbines, allow-
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