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).
Log of breakages and remarks from a bump test on a Tomahawk chassis front.
| Identifier | ExFiles\Box 180\M1\6\ img032 | |
| Date | 15th December 1921 | |
| BUMP TEST ON TOMAHAWK CHASSIS - FRONT. Breakages | Time run Hours. | Remarks --- | --- | --- O.S. Steering Lever and pivot. | 25+ | The fracture has occurred through the rear bolt hole, the pivot and the lever are broken. Top leaf of front spring - O.S. | 14+ | Leaf made by R-R.{Sir Henry Royce} Top leaf of rear spring - N.S. | 18+ | " " " Top leaf of rear spring - N.S. | 19+ | " " " Front Axle. | 19+ | Broken close to N.S. spring seat. Top leaf - O.S. | 8+ | Woodhead spring. Top leaf - N.S. | 19+ | " " " Engine suspension tube - N.S. | 20+ | Similar fracture to previous one. Spring clip - N.S. | 10+ | Three bolts holding steering column to box. | 62+ | Front axle. | | Broken close to N.S. spring seat. Steering Lever - O.S. | 19+ | Fractured in same place as original ones. R.R. 199 (2501) (SD676 19-7-17) MP18086 | ||