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).
Poor mechanical efficiency figures of an engine, specifically questioning the power required for the rotary valve.
| Identifier | ExFiles\Box 134\5\ scan0006 | |
| Date | 13th March 1940 guessed | |
| - 2 - Cont'd.{John DeLooze - Company Secretary} Rm.{William Robotham - Chief Engineer}3/ML. You mentioned the poor mechanical efficiency figures which Taub obtained on your engine when he had it on his test bed. We cannot concieve any reason why this engine, running at such slow speeds, should have poor mechanical efficiency unless this is due to the power required to drive the rotary valve. Have you any figures as to the actual M.E.P. required to drive this valve? Yours sincerely, | ||