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).
Test results for engine silencer performance and power loss at 3000 R.P.M.
| Identifier | ExFiles\Box 92\2\ scan0180 | |
| Date | 6th November 1933 | |
| -3- Hs{Lord Ernest Hives - Chair}/BHS.1.17/KCR.6.11.33. LOSS. At 3000 R.P.M. Complete silencer with gauze. 3.5 BHP - 2.6"Hg. " " " with Vokes .050 3 BHP. - 2.6 " " " " .075 4 BHP. - 2.65" " " " End cover removed. 3 BHP. - 2.05" " " " Main silencer removed. 0 BHP. - 2.25" Used in conjunction with this silencer is the arrangement where the breather pipe is connected from the rocker cover to the main silencer body. The rocker cover is not yet finished and we have been unable to test out this scheme of breathing. Hs{Lord Ernest Hives - Chair}/L.H. Swindell. | ||