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).
50-hour Coshawk 11 bumping test detailing spring bracket performance and subsequent spring failures.
| Identifier | ExFiles\Box 119\2\ scan0167 | |
| Date | 2nd February 1922 | |
| To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Da.{Bernard Day - Chassis Design} c. to HY.{Tom Haldenby - Plant Engineer} c. to EF. c. to Wor.{Arthur Wormald - General Works Manager} X4268 Hs{Lord Ernest Hives - Chair}4/LGS.2.22. A COSHAWK 11, BUMPING TEST. X4261 X4268 We have completed 50 hours bumping on the rear of the chassis fitted with the new brackets for the front of the rear springs. These have stood up satisfactorily; there is no sign of them failing. During the 50 hours run, we have broken three rear spring top leaves also one front spring top leaf. It was interesting to note that whilst we were bumping the back of the car, we actually broke a front spring. The fracture must have occurred due to torsion of the frame and side translation. Hs.{Lord Ernest Hives - Chair} | ||