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 and data tables comparing the deflection under load for a standard front spring versus a Woodhead special front spring.
| Identifier | ExFiles\Box 42\3\ Scan186 | |
| Date | 23th February 1926 guessed | |
| STANDARD ROLLS ROYCE FRONT SPRING [100LBS] TABLE 1: STANDARD SPRING CAMBER OF SPRING IN INCHES COMPRESSION | LOAD (LBS) + 2.706 | 0 + 2.156 | 175 + 1.656 | 336 + 1.156 | 489 + .656 | 633 + .156 | 812 - .334 | 948 - .844 | 1148 - 1.344 | 1318 - 1.844 | 1504 - 2.344 | 1625 CAMBER OF SPRING IN INCHES BUMP EXTENSION | LOAD (LBS) - 2.344 | 1617 - 1.844 | 1487 - 1.344 | 1329 - .844 | 1142 - .344 | 977 + .156 | 817 + .656 | 672 + 1.156 | 458 + 1.656 | 308 + 2.156 | 147 + 2.706 | 0 WOODHEAD SPECIAL FRONT SPRING [100LBS] TABLE 2: WOODHEAD SPECIAL SPRING CAMBER OF SPRING IN INCHES COMPRESSION | LOAD (LBS) + 2.669 | 0 + 2.189 | 119 + 1.689 | 364 + 1.189 | 490 + .689 | 721 + .119 | 868 - .381 | 989 - .881 | 1155 - 1.381 | 1421 - 1.901 | 1596 - 2.381 | 1764 CAMBER OF SPRING IN INCHES BUMP EXTENSION | LOAD (LBS) - 2.381 | 1729 - 1.881 | 1474 - 1.381 | 1365 - .871 | 1106 - .381 | 959 + .119 | 812 + .669 | 661 + 1.169 | 476 + 1.669 | 336 + 2.169 | 154 + 2.669 | 0 GRAPH AXES & LABELS: Y-AXIS: DEFLECTION IN INCH X-AXIS: LOAD IN LBS GRAPH ANNOTATIONS: STANDARD FRONT SPRING GRADUAL COMPRESSION STANDARD FRONT SPRING BUMP EXTENSION WOODHEAD SPECIAL FRONT SPRING BUMP EXTENSION WOODHEAD SPECIAL FRONT SPRING GRADUAL COMPRESSION | ||