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).
Adoption of a 12.5% stronger spring, its performance compared to the standard 40/50 model, and the impact on vehicle delivery.
| Identifier | ExFiles\Box 72\3\ scan0074 | |
| Date | 12th August 1924 | |
| - 2 - BY21/H.{Arthur M. Hanbury - Head Complaints} 12. 8. 24. ----------------- Reverting to the 12½% stronger springs, it appears from the information conveyed in the various memos from Sales in this connection that the 12½% stronger spring is almost certain to be adopted, unless a question of strength arises in the 10,000 mile trial. We do not feel that this spring will be any worse than the old standard 40/50 from this point of view, as breakages are not, in my opinion, connected with vertical deflections, but are the result of side deflections, the effect of the inertia of the wheels on the position of the springs when one front wheel is thrown up by a bump on the road. The increased stiffness of spring should make the proposed 12½% stronger spring better from the point of view of resisting fracture than the present 40/50. If you consider that it is more desirable to await the completion of the trials before definitely permitting Firths to order material, this can be done, but it means that it will put back delivery of four wheel brake cars at least the intervening period. Kindly let me know whether the gaiters are to be sent to Conduit Street or Cricklewood. BY.{R.W. Bailey - Chief Engineer} | ||