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).
Fuel consumption tests for a fully supercharged 'Kestrel' engine throttled to, and below, the rated boost.
| Identifier | ExFiles\Box 179\2\ img129 | |
| Date | 6th January 1932 | |
| ORIGINAL To R.{Sir Henry Royce} From Ha/Yng. c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to RE. Ir. c. to By c. to c. to Mr. Jaques. Ha/Yng.2/WJ.6.1.32. x2965 x2431 FUEL CONSUMPTIONS OF FULLY SUPERCHARGED 'KESTREL' ENGINE THROTTLED TO, & BELOW, THE RATED BOOST. We have been requested by Lr{Mr Ellor}/Dor.{Mr Dorey} to carry out some tests to determine what the fuel consumptions of the fully boosted 'Kestrel' engine will be when operating near the ground. This type of engine is throttled to a rated boost of - ¼ lb/sq.in. which can be maintained by opening the throttle to a rated altitude of 11,500 ft. 'Kestrel' 11 S engine No.27 was used for the tests. This is a standard fully supercharged engine with a compression ratio of 6/1. The consumption loop 275'F' was carried out with a constant brake setting which was fixed to give 2250 R.P.M. at the maximum power point. Variations of speed were then recorded for the different mixture strengths. The throttle curves 274'F' shew the effect of throttling from the rated boost on fuel consumption for various speeds between 1800 and 2700 R.P.M. A fully boosted engine flying near the ground is operating under inefficient conditions due to the fact that the blower is throttled and the ignition, being interconnected with the throttle is not at its best position. As the altitude increases and the throttle is opened the consumptions will therefore improve. Ha/H.R.Young. Attached: Curves 274 & 275'F'. | ||