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).
Engine performance, critical periods, and the strength of the 40/50 shaft.
| Identifier | ExFiles\Box 25\3\ Scan293 | |
| Date | 1st December 1927 guessed | |
| contd :- -2- be increased as much as 100% without insuperable difficulties, which should enable us to put the critical period to above 4000 r.p.m. even with the increased big end weight. The 40/50 shaft to LeC.2488 seems only relatively weak on the pins. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||