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).
Goshawk exhaust noise issues, particularly 'booming' sounds in relation to different coachbuilt bodies.
| Identifier | ExFiles\Box 48\4\ Scan182 | |
| Date | 28th November 1922 | |
| Y4238 PN {Mr Northey} 3/DN/28.11.22. TO Hs. {Lord Ernest Hives - Chair} c. to BJ. FROM PN. {Mr Northey} Goshawk Exhaust. In reply to your Hs {Lord Ernest Hives - Chair} 2/LG24.11.22, I can quite appreciate what an enormous amount of work has been done with a view to getting the exhaust with its silencer into a reasonably silent and effective state. My own feeling is that the trouble is one more of period than anything else, which becomes apparent only when bodies such as a Landaulet or Limousine are placed on the chassis. If it could be established that this is the case, you might be able to make some modification which would certainly alter the period to reduce the trouble to negligible limits. You may be quite sure that whilst taking up this matter with you, we have taken it up even more strongly with the coachbuilders, although one is always faced by this fact, that the initial responsibility for any sounds with a new body rests with the chassis, that is, even "booming" would not take place in a closed body unless there was a vibration of some description started in the first place by one of the chassis components to which the body is unfortunately resonant. PN {Mr Northey} P.N. RECEIVED | ||