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).
Component breakages and their time to failure during a bump test on a Goshawk front chassis.
| Identifier | ExFiles\Box 119\2\ scan0158 | |
| Date | 15th December 1921 | |
| BUMP TEST ON GOSHAWK CHASSIS - FRONT. Breakages. | Time run hours. | Remarks. ---|---|--- O.S. Steering Lever and pivot. | 25½ | The fracture has occurred through the rear bolt hole, the pivot and the lever are broken. Top leaf of front spring - O.S. | 14¼ | Leaf made by R-R.{Sir Henry Royce} Top leaf of rear spring - N.S. | 18¼ | " " " " Top leaf of rear spring - N.S. | 19¾ | " " " " Front axle. | 19¾ | Broken close to N.S. spring seat. Top leaf - O.S. | 8¾ | Woodhead spring. Top leaf - N.S. | 19½ | " " Engine suspension tube - N.S. | 20¼ | Similar fracture to previous one. Spring clip - N.S. | 10¼ | Three bolts holding steering column to box. | 62½ | Front axle. | | Broken close to N.S. spring seat. Steering Lever - O.S. | 19½ | Fractured in same place as original ones. | ||