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).
Reducing exhaust noise in the Phantom model car by testing two different silencer designs.
| Identifier | ExFiles\Box 66\2\ scan0085 | |
| Date | 1st September 1925 | |
| R.R. 493A (50 H) (D.D. 91. 12-6-25) J.H.D. 48230 EXPERIMENTAL REPORT. Expl. No. REF: Hsl/LG16.9.25. 'PHANTOM' EXHAUST. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} The exhaust noise on the Phantom car is undoubtedly greater than that of the Silver Ghost. The Sales Dept. have criticised this point at various times. The attached report gives particulars of two silencers on which we have tried to reduce the amount of exhaust noise. (A) is identical to the present standard silencer except that the sizes of the holes in the baffles were modified. This affected a definite improvement but when it was tried by Sales, they still complained the noise was objectionable. (B) is very similar to the present silencer except that an extra concentric tube is fitted inside the silencer. The amount of exhaust noise with (B) is less than with (A) silencer. A (B) type silencer has been tried by Sales. So far they have expressed themselves satisfied with it. Hs.{Lord Ernest Hives - Chair} | ||