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).
Design position report detailing the status of development on various engine components.
| Identifier | ExFiles\Box 30\3\ Scan097 | |
| Date | 18th February 1935 guessed | |
| (8) ITEM. DESIGN POSITION. SINGLE CYLINDER AND GENERAL RESEARCH - CONTINUED:- Bentley centrifugal supercharger:-spiral bevel drive In hand. and flexible couplings. KESTREL ENGINE. R.R. Variable pitch airscrew hub. In hand. Venting of oil tanks to wheelcase. Completed. MERLIN "B" ENGINE. Modified valve lift curves .590" lift. Completed. Long reach 14 mm. sparking plug. Completed. Piston 6.5:1 compression ratio. Completed. Modn.to ramp cylinder head - sparking plug on inlet In hand. side. Modn.to water circulation system. In hand. MERLIN "C" ENGINE. Strengthened supercharger drive gears - 10.13:1 ratio. Completed. Supercharger and dynamo drive. Completed. | ||