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Aviation History
1928
1928 - 0313.PDF
APRIL 26, 1928 THE BRISTOL "JUPITER" VIII PASSES 100 HOURS' TEST THE 100-hour official bench test on the Jupiter VIII engine,carried out in accordance with the British Air Ministry require- ments, was successfully completed in last month, the enginebeing officially rated at 440 h.p. at 5,000 ft. The tests, in accordance with the following synopsis, werecarried out on the Froude Dynamometer, and officially observed by the Inspectors of the British AeronauticalInspection Directorate. The engine maintained its power throughout the test, the full throttle brake horse-power devel-oped at the end of the 100 hours being within 1 per cent, of that developed at the commencement of the test. After the completion of the test the engine was strippeddown and officially inspected ; the general condition was excellent, there being a complete absence of measurable wearon the reduction gear components, while the average wear on the major components of the engine was, as shewn in theaccompanying officially signed chart, remarkably low, being only a fraction of the wear permissible before replacementsare required. In order to cover the Series IX and XI engines, which differonly in compression ratio, a supplementary run of one hour at 540 b.h.p. and 2,200 engine r.p.m. was carried out on the 5-3compression engine ; this was carried through with complete success, the engine stripping in perfect condition. The synopsis of the test schedule is as follows :— Preliminary Power Curve 1J Hours.—Carried out at fullthrottle from' 1,600 to 2,200 engine r.p.m. Endurance Test 100 Hours.—Carried out at 2,000 enginer.p.m., and at the 90 per cent, equivalent ground rating, in 10- and 15-hour non-stop runs. The final hour engine ran atfull rated power. High Speed Test 1 Hour.—Carried out at 2,310 engine r.p.m.,or 5 per cent, in excess of the maximum permissible r.p.m. Slow-running and Acceleration 10 Mins.—Sustained runningat 440 engine r.p.m. and accelerations up to normal r.p.m. High Power Test 1 Hour.—Carried out at maximum permis-sible r.p.m. and at 6 per cent, in excess of rated power. Final Power Curve 1J Hours.—Carried out at full throttlefrom 1,600 to 2,200 engine r.p.m. Fuel and Oil Consumptions.—The average consumptionsfor the 100-hours' endurance test at 90 per cent, power were : fuel, 27-J gallons per hour ; oil, 10 pints per hour. Wear on major components during the test is given in the following table :— ICD 130 125 120 580 570 560 550 540 530 520 510 500 4Q0 480 470 460 450 440 •60 •55 50 i i //// J/ V y J /i 1 ® 1600 700 I8OO 1900 EOOO cMOO ENCINE RP.M Power Curves (full throttle) of Bristol " Jupiter VIII " J.8014 for 100-hour Air Ministry Test. Two views of the Bristol "Jupiter" Series VIII geared engine, which has just successfully passed views oi through the Air Ministry 100-hours' Type Test.
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