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).
Details on the reduction ratio for the Goshawk I and Goshawk II starter.
| Identifier | ExFiles\Box 35\4\ scan 022 | |
| Date | 24th May 1921 | |
| S.R. 255a-(100 T) (R.H. 29, 22-7-20) G 2769 X.4384 EFC/T24.5.21. X. 3534 - REDUCTION RATIO FOR GOSHAWK STARTER X.4384. Goshawk I was originally fixed at 48 to 1, but was later altered to 14.4 to 1. For Goshawk II this has been fixed at 8.4 to 1. E.F.C EFC. | ||