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).
Performance data tables showing RPM, Pounds, and Consumption at 35% and 40% settings.
| Identifier | ExFiles\Box 50\3\ Scan209 | |
| Date | 22th December 1921 guessed | |
| 35% R.P.M. Lbs. Cons. 1750 97 52 2000 93.5 57.5 40% R.P.M. Lbs. Cons. 1750 98 52 2000 94.5 56.5 [Faint watermark in reverse: BICKINGROW BOND] | ||