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).
Test data for Woodheads rear road springs showing weight applied and released.
| Identifier | ExFiles\Box 42\3\ Scan144 | |
| Date | 16th March 1923 | |
| X3854 Mr. Hives. from GWH.{George W. Hancock - Head Chateauroux} 16.3.23. REAR ROAD SPRINGS - WOODHEADS. 2200 lbs. 10 leaves. Weight applied. | Weight released. ------------------------------------------------ 1/2 | 469 | 427 1 | 812 | 784 1 1/2 | 1176 | 1127 2 | 1554 | 1484 2 1/2 flat | 1904 | 1876 camber | 3 | 2268 | 2261 3 1/2 | 2688 | 2597 4 | 3059 | 2982 Leaves dry. 4 1/2 | 3598 | 3500 5 | 3983 | 3829 5 1/2 | 4340 | ---- | ||