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).
Letter from The National Omnibus & Transport Co. Ltd. complaining about a booming noise in a Phantom II chassis.
| Identifier | ExFiles\Box 137\4\ scan0249 | |
| Date | 6th March 1931 | |
| C O P Y. The National Omnibus & Transport Co. Ltd., Engineer's Office, Anchor Works, Chelmsford. 6th March, 1931. Telephone: Chelmsford 31. Telegrams: National, Chelmsford. WJM/RMP. Your Ref: Hd{Mr Hayward/Mr Huddy}/WW3/KW5.3.31. Messrs. Rolls-Royce Ltd., Derby. For the attention of Mr. Haywood. Dear Sirs, Rolls-Royce Phantom II Chassis 119-GN. W.J. Iden Esq. We thank you for yours of the 5th instant, respecting our Managing Director's car, and note that you have verified that there is a booming noise at 50 to 60 miles per hour. You go on to say that you hope our Managing Director does not find this noise very annoying, but this is exactly what he does do. His business calls for him to travel long distances at a good rate of speed, and the booming noise becomes intolerable after a while, and will certainly have to be cured. As mentioned in our previous letter, we have formed a very definite opinion as to the cause of the noise, and feel very surprised that your Experimental Department have not got to the root of the matter. There is no question but that the noise is produced by the exhaust beat. For your information we would mention that the note judged by a musical ear is somewhere in the neighbourhood of 120 periods per second, and this practically coincides with the number of beats in the exhaust at 60 miles per hour, to our mind proving what we say as to the cause of the trouble is correct. Cont'd.{John DeLooze - Company Secretary} | ||