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).
Modifications and tests for the rear spring and axle to reduce stress.
| Identifier | ExFiles\Box 80\3\ scan0048 | |
| Date | 10th March 1915 guessed | |
| To Wor.{Arthur Wormald - General Works Manager} for Hy.{Tom Haldenby - Plant Engineer} from R.{Sir Henry Royce} 2. COPY. R9/IB10315. I should be glad therefore if you could re-arrange the road spring under the axle, and use the type made of thick plates with the lower plate split at the back end, or the type which has a central vertical swivel pin at the middle of the cantilever spring. You would then be testing these improvements as well as the rear axle tube, which would give you a bumping test of double value. To tabulate the points necessary to reduce the stresses in the rear spring pivot, we have - (1) Transfer the spring from above the axle to below the axle. (2) Split the after part of the top leaf and allow it to move sideways independent of the other leaves, that is, not clipped together. (3) Provide a vertical pivot, in which case you can split the longest plate of the spring, both fore and aft. Any combination of these should improve the behaviour of the chassis and reduce the stresses. You will notice that with reference to the two brackets sent to me, probably one broke first and afterwards the other ones. On examination of these parts, I am not sure that I understand the reason of this breakage, but I feel sure it is caused by the side pressure due to the lateral movement when passing over the humps. It would appear that these had a tendency of rolling over the frame, which first breaks the piece F.1328, after which the other | ||