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 status report for Kestrel and Merlin engine components.
| Identifier | ExFiles\Box 30\3\ Scan087 | |
| Date | 4th February 1935 guessed | |
| (8) ITEM. DESIGN POSITION. KESTREL ENGINE: RR. Variable pitch airscrew hub. In hand. Drive for vacuum pump (Kestrel VI engines for Holland). Completed. Piston 6.5:1 compression ratio.- no cooling ribs - ramp head. Completed. Mods. to 2-speed supercharger - oil supply etc. Completed. Increased loading valve springs - ramp head. Completed. MERLIN "B" ENGINE. Modified cyl.head water passages - to suit existing castings. Completed. MERLIN "C" ENGINE. Variable timing gun gear. Completed. Electric starting gear. Completed. Modified ramp cylinder head - larger induction ports. Completed. Servo oil pump and drive. Completed. Strengthened supercharger drive gears - 10.13:1 ratio. In hand. Modified water pump outlets - to clear electric starter. Completed. | ||