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).
Drawing of a Goshawk II gearbox with speed ratio calculations.
| Identifier | ExFiles\Box 75\1\ scan0264 | |
| Date | 9th March 1923 | |
| R.R. 199 (250T) (SD676 19-7-17) MP180865 GOSHAWK II. GEAR BOX. X4247 9.3.23. 35 28 37 22 57 28 19 14 Second Speed Ratio = 35/57 = .614 1.626 reverse speed Ratio = 35/57 X 14/37 = .2322 First speed Ratio = 35/57 X 19/37 = .315 3.175 -------------- | ||