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).
Graph of road speed against engine RPM for the Goshawk II & III gear ratios.
| Identifier | ExFiles\Box 6\4\ 04-page034 | |
| Date | 27th January 1925 guessed | |
| GOSHAWK II & III GEAR RATIOS. ROAD SPEED FOR ENGINE R.P.M. ______ GOSHAWK III 4 SPEED BOX. _ _ _ _ _ GOSHAWK II 3 SPEED BOX. THESE CURVES ARE FOR 11/50 AXLE RATIO. AND THE FOLLOWING, GEAR BOX RATIOS:- G.III. 1 ST 3.73 2.ND. 2.33 3.RD 1.51 TOP 1.00 REVERSE. 3.20 G.II 1ST 3.17 2.ND. 1.63 TOP 1.00. REVERSE 4.30. EFFECTIVE WHEEL DIA. IS. 31.4" MILES PER HOUR M.P.H. ON REVERSE. ENG. R.P.M. TOP GEAR, BOTH BOXES 3.RD SPEED G.III 2.ND SPEED. G.II 2.ND SPEED G.III 1.ST SPEED G.II 1.ST SPEED G.III REVERSE. G.II REVERSE. G.III | ||