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).
Analysis of bodywork design to reduce wind noise, comparing door shut resonance to a toy whistle.
| Identifier | ExFiles\Box 160\2\ scan0177 | |
| Date | 22th February 1934 guessed | |
| - 8 - (4). The screen should be flush in the wooden frame and not stepped down from the latter, either at the sides or top. It would be preferable to avoid sharp edges by deleting the glass channel on cars with fixed screens. (5). Door shuts must register flush and must not be stepped either way. It is preferable for the leading edge to be the higher. We have reason to believe that the sharp edges of our doors and pillars are contributory to the cause of roars and note that the American Cars are very flush jointed, and have radiused edges. (6). All sharp leading edges are contributory to the cause and should be avoided, especially where they have a cavity behind them to act as a sound box. The similarity to a whistle can be seen from the attached sketch:- [Diagram of a toy whistle] SLOT RESONANCE CHAMBER TOY WHISTLE [Diagram of a door shut] SLOT RESONANCE CHAMBER DOOR SHUT These tests should be regarded as preliminary to further investigations. In fact, most of the ground has been covered by J.L.E. So far, even when we have made the best of a car by taping, etc., we have not been able to equal the silence of the Essex Terraplane. EV.{Ivan Evernden - coachwork} ---- | ||