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).
Technical memo comparing supercharger gear ratios and their effect on engine performance and temperatures.
| Identifier | ExFiles\Box 36\2\ scan 164 | |
| Date | 16th March 1928 guessed | |
| contd :- -2- to drive blower. (Also for the same HP. reading in each case, the altitude blower would be working under throttled conditions - involving an increased pressure rise across the blower). In the case of the 6.9/1 geared S/C., the mixture pipe temp. was 15°C (approx.) - corresponding to a figure of 9°C with the 5.5/1 geared S/C - the initial air temperature being the same (18°C) in each case, for full throttle conditions at 2250 r.p.m. With a wider rotor and a 5.5/1 gear ratio, we hope to improve the engine performance, without the corresponding increase in mixture pipe temperature, by running the blower under conditions of greater efficiency. Owing to the wet bulb effect on the thermometer, temperature measurement in the mixture pipe can only be used for comparison purposes. Hs{Lord Ernest Hives - Chair}/V.Halliwell. | ||