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).
Failed experiment with rubber body mounting on a trials car and an inquiry into using rubber to reduce tyre noise on a 25/30 chassis.
| Identifier | ExFiles\Box 106\1\ scan0411 | |
| Date | 20th April 1937 | |
| 546. [handwritten signature] GRY{Shadwell Grylls} S/W. Rm.{William Robotham - Chief Engineer} 25/30 h.p. Cx{Major Len W. Cox - Advertising Manager}1/KW20.4.37. As you may have heard from LA{L. A. Archer}, the experiment of mounting the Hooper Close-coupled Saloon body for our new Trials Car GWN-8 with rubber packing between the body and the brackets on the chassis, as on P.III, has not been a success due to the apparent flexibility of the chassis frame coupled with the somewhat flexible method of mounting the body, allowing too much movement and consequent continuous creaks and chattering. You will probably remember that the experiment was to be tried with a view to reducing as much as possible noises arising from tyres, etc. Hoopers are now converting the mounting of this body to standard for this type of chassis. A point we should like to ask you therefore is whether it is possible to introduce on the present 25/30 chassis rubber between the axle and the springs, to help to eliminate tyre noises. We have not yet tried the 25/30 on the new pattern silent tyres such as we have been using on the London Trials Phantom III's, and we certainly expect some improvement from these with the standard chassis arrangement. We do not however anticipate that the results will be 100%, and would therefore be glad to know if it would be a simple matter to introduce rubber between the axle and springs and whether it has yet been tried experimentally. Cx.{Major Len W. Cox - Advertising Manager} [handwritten signature] | ||