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).
Summary table of a bumper test on a Goshawk II chassis, detailing component failure times in hours.
| Identifier | ExFiles\Box 180\M1\1\ img096 | |
| Date | 26th October 1921 | |
| R.R. 224A (100 T) (S H.{Arthur M. Hanbury - Head Complaints} 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1947 26.10.21. BUMPER TEST ON GOSHAWK II, CHASSIS. Unit. | Total number of hours run before failure. Rear spring clip on offside front spring. | 7 1/2 hours. Rear spring clip on near side front spring. | 10 1/2 hours. Rear spring clip on near side front spring. | 7 1/2 hours. Top leaf off-side front spring. | 10 1/2 hours. Top leaf near-side front spring. | 12 1/2 hours. Top leaf off-side front spring. | 9 1/2 hours. Off-side cross steering arm. | 11 1/2 hours. Near-side steering arm. | 20 1/2 hours. | ||