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Aviation History
1933
1933 - 0120.PDF
FLIGHT ADVERTISEMENTS JULY 13, 1933 ;o Hours at Full Throttle aed Maximum Speed. Demonstration of the Efficiency Pegasus Engine. IfeOO 7i0 700 t9Q UO UK w,c tsd i>40 fc30 iSO UQ toe 990 5SD 570 •5fcO "550 540 530 5B0 510 ;oc 490 4AC u I7O0 .00 171 50 H^ FU1 © ® ISOO ENC.INE R I9O0 EOOO i PN ElOO stoo «00 i u Q\ E400 I i _ •^ / / \ / / \ AS) 50 ISOO I90O EOOO ElOO tCOO 23 ENGINE R.RM PEGASUS ll-L ENGINE. P. 6001. .LTHROTTLE HIGH SPEED DEVELOP! POWCK CURVE AT COMMENCEMENT OF TEST POWER CURVt AT CONCLUSION Of 50 H^ FU •• 00 B400 70C (flfl fc80 wn tVl <,40 /,V> *Jt> .,,' too •m V(. '•X: SO) sw W) wn s?n SO 500 190 (SO vIEhfTTESr. J.TH ROT n_t rtsi AT t 100 fw APPROVtO >S5C. A '' Bristol'' Pegasus " L " engine was recently subjected to a 50 hours' full throttle high speed test, developing 680 B.H.P. and running at 2,300 r.p.m. throughout, a speed of revolution 15 per cent, in excess of the rated speed. The conditions of the test were made more rigorous by the high temperature of the oil fed to the engine, which was not allowed to drop below 80° Centigrade. Despite these severe conditions the engine ran consistently well with a negligible drop in power throughout, and a comparison of the calibration curves taken before and immediately after the test show that the drop was under 2 per cent. It is of interest that the engine, prior to reconditioning for this test, had completed approximately 500 hours running on the bench and in flight, including two official type tests and a one hundred hours' flight test in a seaplane. This test was in accordance with the " Bristol" practice of submitting engines of each new series to a full throttle development test, believing that whereas the present standard Air Ministry type test forms a useful basis for establishing the relative performance and reliability of new types, an engine when fully developed should stand up to something more strenuous in order to ensure an ample margin of reserve. oovi+tHTtr*. I£ A.i O ENSUES OATl /0 61 ?J FB Sfcud THE BRISTOL AEROPLANE CO., LTD. —FILTON, BRISTOL. Printed for the Proprietors and Publishers, THE ST. MARTIN'S PUBLISHING CO., LTD., 36, Great Queen Street, Kingsway WC2 by HARRISON & SONS, Lt»|i 44 47. St. Martin's Lane, London, VV.C.2. Agents for the Colonies: GORDON & GOTCH, LTD., London, Melbourne, Sydney Brisbane Perth Launceston (TaS.), Wellington (N.Z.), Ouuedin (N.Z.). Canada—45, Richmond Street East,'Ioronto. South Africa—CENTKAL NEWS AGENCY LTD Entered at the New York P"5' Officii as second-c)as» matter.
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