From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Outline of American type test requirements for aircraft engines, detailing dynamometer calibration and a 150-hour endurance test.
| Identifier | ExFiles\Box 27\3\ Scan236 | |
| Date | 15th May 1939 guessed | |
| 29 OUTLINE AMERICAN TYPE TEST REQUIREMENTS FOR AIRCRAFT ENGINES 1. Complete dynamometer calibration, including performance under simulated conditions of critical altitude. This includes correct carburettor air temperature and pressure and correct exhaust pressure for the altitude simulated 2. Endurance test of 150 hours duration:- a.{Mr Adams} 25 hours of alternate periods of 2-1/2 hours each at normal rated power and speed and at 90 per cent normal rated power and 97 per cent normal rated speed. b. 15 hours of alternate periods of 5 minutes at take-off or military rated power and speed and 10 minutes at as low an idling speed as practicable. c. 15 hours of alternate periods of 5 minutes at take-off or military rated power and speed and 10 minutes at 60 per cent of take-off or military rated speed on propellor load. d.{John DeLooze - Company Secretary} 25 hours of alternate periods of 2-1/2 hours each at normal rated power and speed and at 80 per cent normal rated power and 93 per cent normal rated speed. e.{Mr Elliott - Chief Engineer} 25 hours of alternate periods of 2-1/2 hours each at normal rated power and speed and at 70 per cent normal rated power and 89 per cent normal rated speed. f.{Mr Friese} 25 hours of alternate periods of 2-1/2 hours each at normal rated power and speed and at 60 percent normal rated power and 84 per cent normal rated speed. g.{Mr Griffiths - Chief Accountant / Mr Gnapp} 15 hours of alternate periods of 2-1/2 hours each at 80 per cent normal rated speed power and 93 per cent normal rated speed and at 70 per cent normal rated power and 89 per cent normal rated speed. H.{Arthur M. Hanbury - Head Complaints} 5 hours at normal rated power and 110 per cent normal rated speed | ||