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).
Proposing a new multi-chamber exhaust silencer design to eliminate a tinny noise.
| Identifier | Morton\M1.1\ img025 | |
| Date | 7th September 1921 | |
| To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} Copy to C.I. ORIGINAL. X3436 X RE EXHAUST SILENCER. With reference to the tinny noise in the exhaust, this must be due to the thin exhaust pipes, which possibly may require lagging or be made of thicker metal. When you come to the silencer itself I think it would be wise to try one having an inner concentric chamber tube, the outer tube being used for the last cells, that is, the inner tube would have diaphragms in and perforated towards the end where it would exhaust into the outer tube, from which is led the exhaust pipe so that the sharp rasping would be a silencer within a silencer. [Hand-drawn diagram of a silencer with three chambers labeled '1st', '2nd', and '3rd', showing the flow of exhaust gas. The text 'A/R' is written above the silencer.] RECEIVED. | ||