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).
Halting the production of 20/25 pistons pending the results of a 10,000-mile test on a new long skirt piston design.
| Identifier | ExFiles\Box 5a\4\ 04-page157 | |
| Date | 21th November 1934 | |
| 45840 To By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/KW.21.11.34. Referring to Ry15/J.19.11.34, we do not think it necessary to scrap any of the existing 20/25 pistons, either unmachined castings or in process of manufacture. We would suggest, however, that no more castings are made until the completion of our 10,000 miles run on 21-G-IV, when we shall be in a position to say whether the long skirt piston appears to be an advantage over the present 20/25 size. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||