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).
To the technical committee proposing a simple scheme to fix explosions in the silencer.
| Identifier | ExFiles\Box 1\3\ B001_X 93-page01 | |
| Date | 3rd March 1912 | |
| Recd. 9/4/12. Le CanadelHenry Royce's French residence. March 3rd. 1912 [STAMP: 10 APR 1912] Members of the Technical Committee. X 93 Re Explosions in Silencer. These have troubled us for some time both in closing the throttle when running fast and also in running down hill with the engine as brake. Why we are more troubled than most people has been explained lately, and several ways suggested of reducing the tendency. I now give an extremely simple scheme which I think will end this trouble and avoid any need of trying the devices I have already suggested. The throttle is exposed to a nearly complete vacuum. i.e. pressure of 13 lbs below the atmosphere, therefore a slight leak of a large throttle will allow quite a quantity of air to pass. This mostly passes the small jet as the large jet and extra air valve is closed. The arrangement shown provides a flat or conical face valve to close the extension of the small throat which is easily done as there is very little difference of pressure in any part of the carburetter. Should the throttle be very leaky a slight vacuum will occur in the carburetter body, the air valve will lift and allow a small quantity of air to pass the large jet, | ||