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).
Frame failure during a bumping test, caused by a new bracket controlling the front spring.
| Identifier | ExFiles\Box 72\3\ scan0012 | |
| Date | 11th March 1924 | |
| DA.{Bernard Day - Chassis Design} c. Hs.{Lord Ernest Hives - Chair} c. Rg.{Mr Rowledge} X410 BY9-P11.3.24. FRONT BRAKES. REAR BRACKET CARRYING REAR END OF FRONT SPRING. Hs.{Lord Ernest Hives - Chair} will be reporting today or tomorrow upon the fact that with the new bracket controlling the front spring at its rear end we have actually broken the frame completely in half during the bumping test. The length of time the frame was actually running was only 24 hours, so that it would appear that the stresses imposed by the long bracket at the frame at this point are very serious and will have to be considered without delay from a design point of view. The breakage took place immediately behind the bracket in question, the crack passing right through the bolt hole at the front end of the tie bar strut bracket. It would therefore appear to be necessary for a reinforcement to be run along the frame for some distance fore and aft of the rear spring bracket, with the object of reducing the stress at these points. Would you kindly give this matter attention and let us have any proposals you wish to make in this connection at the earliest possible moment. BY.{R.W. Bailey - Chief Engineer} | ||