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).
Concluding page of a report comparing performance figures for a modified 20 HP engine against the 40/50 HP and standard Phantom models.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 9 | |
| Date | 17th January 1927 guessed | |
| contd :- -2- to try and minimise the reaction of the vigorous power impulses. Attached are some figures of performance for the 40/50 HP., from which it will be seen that the modified 20 HP. closely approaches the performance of the standard Phantom. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||