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).
Decision memo on not adding vanes to the umbrella rotor for the battery ignition system.
| Identifier | ExFiles\Box 32\5\ Scan073 | |
| Date | 8th December 1927 | |
| X6046X/7690 EFC. FROM E.{Mr Elliott - Chief Engineer} C. to BJ. HS.{Lord Ernest Hives - Chair} E1/M8.12.27. re. UMBRELLA ROTOR. BATTERY IGNITION. R.{Sir Henry Royce} has decided not to make any attempt to add vanes to the umbrella rotor, as he thinks its chief purpose is that of a separator. E.{Mr Elliott - Chief Engineer} RECEIVED | ||