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).
Requesting Mean Effective Pressure and valve spring details for 20 HP and 40/50 engines.
| Identifier | ExFiles\Box 25\3\ Scan159 | |
| Date | 8th November 1926 | |
| To E.{Mr Elliott - Chief Engineer} from R To Hs.{Lord Ernest Hives - Chair} c. to BJ. Wor.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} +634 RL/M8.11.26. 20 HP. AND 40/50 ENGINES. X.8771 X.634 X.5771 X.8010 X.8060 Letter MEP. needed for the above - maximum HP. just under master crankshaft period, also valve springs suitable for just under this speed. R.{Sir Henry Royce} | ||