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Aviation History
1933
1933 - 0172.PDF
FLIGHT ADVERTISEMENTS. JULY 20, 1933 50 Hours at Full Throttle and Maximum Speed. station 'asus fine. l«>0 7IO 700 tao tso (-7C *c (SO MO (.30 480 wo fcOCJ t5*0 •550 570 SfcO no 540 510 5co 510 ^00 490 4&0 K 17O0 .00 <7t 50 H*? FUl © iaoo ENGINE R 1900 200O 1 1 P M EJOO zzoo 1 / i\ y £iO0 EAOO ! i Q / \ / >o isoo 1900 tooo BOO eeoo es ENGINE R.PM PEGASUS II-L ENGINE. P.6001. .LTHROTTLE HIGH SPEED DEVEUOPt POWER CURVE AT COMMENCEMENT OF TEST POWER CURVE fiT COrKLUStON OF 50 H*?5- FU 1 >r y/1 © 7no tan hfln *70 tvi MO HYI i?ri WO W) Wi •an <kX) TO) sar, •5 V) WO W) sno *90 <N) 00 E40O «NTTEST. J.TH ROT "LT rcajf AT e 10O RPK aPPROVtt 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. ajb-uumrr*. H ».) D CNONES OWl /0 6 < ?J F6 S«I4 THE BRISTOL AEROPLANE CO., LTD.-FILTON, BRISTOL Printed tor the Proprietors and Publishers, THS ST. MARTIN'S PI'BUSHINC CO., LTD., 36, Great Queen Street, Kinsswav, W.C.2, by HARRISON & S0I<n'(TaS'i' 44-47, St. Martin's Lane, London, W.C.2. Agents for the Colonies: GOROOW & GOTCH, LTD. London Melbourne. Sydney. Brisbane. Perth, Launcestun^ ^ Wellington (N.Z.), Dunedin (N.Z.). Canada—45, Richmond Street East, Toronto. South Africa—CEMTHAL NEWS AGENCY LTD Entered at the New Ofhee as ^ocond-clas. matter.
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