Bumper test report on the Goshawk II chassis, listing component failure times in hours.
| Identifier | Morton\M1.1\ img096 | |
| Date | 26th October 1921 | |
| R.R. 225A (100 T) (S.H. 798. 10-12-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 3947 BUMPER TEST ON GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II. CHASSIS. 26.10.21. Unit. | Total number of hours run before failure. ---|--- Rear spring clip on offside front spring. | 7 1/4 hours. Rear spring clip on near side front spring. | 10 1/4 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. | ||
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).