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 versus engine RPM for Goshawk II & III gear ratios.
| Identifier | ExFiles\Box 6\4\ 04-page166 | |
| Date | 15th May 1926 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 2.73 2.ND 1.51 3.RD 1.00 REVERSE 3.20 G.II 1ST 3.17 2ND 1.63 TOP 1.00 REVERSE 4.20. EFFECTIVE WHEEL DIA. IS 31.4" AXIS LABELS: MILES PER HOUR M.P.H. IN REVERSE ENG. R.P.M. GRAPH LINE LABELS: TOP GEAR. (BOTH GEARS) 2.ND SPEED G.III 2.ND SPEED. G.II 3.RD SPEED G.III 1.ST SPEED G.II REVERSE G.III REVERSE G.II | ||