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).
Data table comparing chassis starter particulars for the 40/50 and Goshawk models.
| Identifier | ExFiles\Box 34\3\ Scan167 | |
| Date | 17th December 1920 | |
| X.2642 17.12.20. X.2642 X 3082 CHASSIS STARTER PARTICULARS. | | 40/50. | | | GOSHAWK. | |---|---|---|---|---| | | 45a. | 45a.sp.{Mr Spinney} | 45b. | | | ENGINE REVS. | 40 | 61 | 42 | 60 | | RATIO. | 23.3 | 23.3 | 23.3 | 14.4 | | MOTOR REVS. | 930 | 1420 | 980 | 864 | | MOTOR TORQUE. | 55.5 | 55.5 | 55.5 | 30.5 | | ENGINE TORQUE. | 1175 | 1175 | 1175 | 400 | | AMPERES. | 118 | 134 | 121 | 64.3 | | VOLTS. | 9.95 | 9.9 | 9.5 | 9.7 | | E.H.P. | 1.57 | 1.78 | 1.54 | .836 | | B.H.P. | .82 | 1.25 | .863 | .418 | | EFFICIENCY. | .52 | .70 | .56 | .5 | Contd. | ||