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 report comparing exhaust temperatures with different silencer arrangements and suggesting design improvements.
| Identifier | ExFiles\Box 13\3\ 03-page120 | |
| Date | 22th October 1929 guessed | |
| -2- The temperature recorded during this test are considerably higher than encountered on a road test, the max. road test temperature being approx. 300°C. The arrangement was slightly different for the road test because the outlet pipe after passing through the small silencer entered into the swan neck at the rear of the silencer. This, and a certain amount of air cooling derived from the fan, would probably account for the lower temperature recorded on the road test. We have not experienced any disadvantage due to the high hot spot temperature. The jacketed area is smaller than used on the F2B Series Phantom. For hot spots we rather favour a high temperature over a small area near the carburetter to moderate temperatures over large areas. We think however, with a system of this type it would be preferable to employ cast iron hot spot bends. Appended is a print of the experimental silencer we employed and power and temperature curves. Hs{Lord Ernest Hives - Chair}/ACL. | ||