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).
Requiring bigger silencers for the P.2. and 25HP exhaust systems.
| Identifier | ExFiles\Box 179\1\ img034 | |
| Date | 20th October 1931 | |
| FROM. R.{Sir Henry Royce} C. to MR. H.S. C. to MR. [REDACTED] ORIGINAL R2/M20.10.31. x7230 x5220 P. 2. & 25HP. EXHAUST SYSTEMS. Experience at Derby is shewing that we require bigger silencers on both our cars, as with the increased HP. the present silencers - if made free enough to reduce the losses to a reasonable amount - are not silent enough. We are therefore using the Phantom silencer on the 25HP., and making a newer and larger silencer for the Phantom. R.{Sir Henry Royce} | ||