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).
Confirming a checked engine rating, noting an extra margin for production engines.
| Identifier | ExFiles\Box 36\2\ scan 215 | |
| Date | 10th May 1929 guessed | |
| contd :- -2- We have checked the rating and find we have 7 B.HP. in hand at 4000 ft. - i.e. 532 instead of 525 B.HP. giving extra margin for production engines. Hs{Lord Ernest Hives - Chair}/V.Halliwell. | ||