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).
Tests on the air silencer for the 20/25 HP, noting a power drop and suggesting a modification.
| Identifier | ExFiles\Box 25\1\ Scan039 | |
| Date | 3rd January 1933 | |
| 84688 To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/KT.3.1.33. X8080. AIR SILENCER FOR THE 20/25 HP. While making tests on the tank carburetter we observed a drop in power of about 6%, due to the form of intake used. We found that if we cut off the two projections A.{Mr Adams} flush with the entry, we regain our lost power. We cannot see any point in these restrictions, and suggest that they could be left off the tank carburetter with advantage. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||