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).
The performance and practicality of supercharging using a centrifugal blower.
| Identifier | ExFiles\Box 173\3\ img038 | |
| Date | 4th April 1934 guessed | |
| SUPERCHARGING BY CENTRIFUGIAL BLOWER. GRAHAM PAIGE Contrary to expectations, this method of car supercharging appears to be practical and efficient. The blower is perfectly silent judged from the driving seat of a saloon car; by lifting the bonnet & revving the engine up light it can be heard but even under these conditions is no more noisy than the fan. The improved performance is noticeable from 35 M.P.H. upwards, at 45 M.P.H. the increased acceleration is marked. That the blower actually does improve the engine efficiency at these speeds is proved by the curve of induction pipe depresion with and without supercharge. ENGINE R.P.M. 1000 1500 2000 3000 4000 INDUCTION DEPN } -.2 -.6 -1.00 -2.00 -3.00 Naturally Aspirated } INDUCTION PRESS. } +.2 +.6 +1.6 +3.70 +6.00 Supercharged } Induction pipe pressures given in 'ins' Hg. | ||