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).
Comparison of front axle weights between the 40/50 HP and Goshawk II models.
| Identifier | WestWitteringFiles\I\June1922\ Scan27 | |
| Date | 15th June 1922 guessed | |
| COMPARISON OF 40/50 AND GOSHAWK II. FRONT AXLE WEIGHTS. | | 40/50 H.P. | Goshawk II. | |---|---|---| | Weight of axle, wheels springs, all unsprung weight. | 330 lbs. | 260 lbs. | | Average sprung weight on front axle. | 1900 to 2400 lbs. | 1150 to 1400 lbs. | | Total | 2230 to 2730 * | 1410 to 1660 * | | Weight of wire wheel and tyre complete. | 57 lbs. | 72 lbs. | | ||