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Aviation History
1949
1949 - 1484.PDF
250 FLIGHT SEPTEMBER IST, T94O CIVIL CENTAURUS Advanced Power Plant for Ambassador ALTHOUGH gas turbines are taking over from large pistonengines in military aircraft and are also moving into• the civil field as well, the civil Bristol Centaurus sleeve- valved. i8-cy]inder radial is now being prepared for introduc-tion into airline service in the Airspeed Ambassadors ordered for BE.A. The Centaurus 661, the particularbnssador, is n two-speed mark 30OO 2J3OO ITAKE-OFF POWERH "1 MAXIMUM EMERGENCY POWER l.OOO , MAXIMUM CONTINUOUS POWER • r— MAX.CONT POWER-LEAN MIXTURE O 5 1O IS 2O 2S 3O 35 < ALTITUDE IN THOUSANDS Of FEET P ovisional curves for power at altitude for the Centaurus 660 and 661. in the Am- Fupercharged unit designed foreconomical opera- tion at 20,000ftusing 100/130 grade fuel. At present itgives 2,700 h.p. for take-off, and provi-sion has been made for the use of water/methanol injection when higher take-offpowers are offered. Development is ex-pected to result in a maximum powerfigure of 3,000 h.p. The capacity is 53.6litres, the diameter 56.6in, and the_ weight 3,330 lb. The power unit is self-contained and interchangeable, and has a four - point mounting. The accessorv sear box, The very tight cylinder baffling of the two-row Centaurus is de- signed to give uniform cooling with the minimum drag. carrying cabin blower and generator, is remotely mounted inthe engine nacelle and driven by a shaft through anti vibration couplings. Four-blade, constant-speed brakingairscrews are fitted, and the 661 has a torquemeter installed. Representative consumption figures on weak mixture are:— Low gear, 2,400 r.p.m., 1,750 b.h.p., 0.440 lb/b.h.p. /hr.; and 1,400 r.p.111., P5o b.h.p., 0.420 lb /b.h.p. /hr. High gear, 2,400 r.p.m., 1,720 b.h.p., 0.465 lb/b.h.p./hr. BRABAZON SIDELIGHTS : The general view of the Bristol Brabazon I emphasises its exceptional gracefulness and shows that civil markings and the Union Jack are now displayed on the fin. Also apparent are the rectangular doors for the main undercarriagt, now, as shown in the c/ose-tp view, having four Dunlob wheels to each assembly. In the third view is the pressure-refuelling valve in one of the two fuel collector boxes.
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