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).
Page describing the advantages of a silencer in preventing back-firing, especially for aeroplanes.
| Identifier | ExFiles\Box 152\3\ scan0160 | |
| Date | 1st April 1934 guessed | |
| 2. There is another important advantage in using this silencer, due to the fact that the gases, as they pass through the silencer, have a rotational speed of about 25 metres per sec. This absolutely prevents back-firing, because any explosion that may occur in the silencer, due to incompletely burned gases, produces a flame which cannot propagate at a greater speed than 14-15 metres per second, and would therefore be effectively arrested by the greater rotational speed of the exhaust gases. This silencer is therefore particularly suitable for aeroplanes, because it entirely obviates the danger from back-firing. | ||