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).
With a diagram, proposing a 'silencer within a silencer' design to reduce a tinny noise in the exhaust.
| Identifier | ExFiles\Box 180\M1\1\ img025 | |
| Date | 1st September 1921 | |
| To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} Copy to CJ ORIGINAL 2. R3/G7/9/21. 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. [Text from diagram: 1st, 2nd, 3rd, TR{Capt. F. W. Turner - Finance}, R.{Sir Henry Royce}] [Faint stamp: RECEIVED] | ||