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 to F. M. Aspin & Co. Ltd. discussing attempts to determine the orifice coefficient of a valve and port.
| Identifier | ExFiles\Box 134\1\ scan0218 | |
| Date | 3rd July 1940 | |
| 1129 Rm.{William Robotham - Chief Engineer}5/JMS. 3.7.40. F.{Mr Friese} M.{Mr Moon / Mr Moore} Aspin, Esq., Messrs. F.{Mr Friese} M.{Mr Moon / Mr Moore} Aspin & Co. Ltd., ELTON, Bury. Dear Mr. Aspin, Thank you for your letter of June 29th. Though we have made several attempts to determine the orifice coefficient of a valve and port by means of air flows, we have never been very successful in converting these results to increased power out-put. In other words, the only comparison is to run a power curve. We attach comparisons of the best valve opening you have been able to produce and the one we are at present using is attached. Yours sincerely, ENC. | ||