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).
Agreeing to use small valves for the Wraith III as a design compromise.
| Identifier | ExFiles\Box 10\3\ 03-page141 | |
| Date | 20th June 1938 | |
| 654 By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. Bs.{A J. Barnes - Assistant Manager} c. HEC. c. Da.{Bernard Day - Chassis Design} c. Mx.{John H Maddocks - Chief Proving Officer} c. HPS.{Horace Percy Smith - Experimental Factory Mgr} Hal/R.20.6.38. WRAITH III. I agree that we must go to the small valves, until we can spread the centres and so get back the existing valve dimensions. This compromises the trouble the High Power head is designed to eliminate, i.e., lack of room when all the valves are in line. Rm.{William Robotham - Chief Engineer} | ||