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).
Proposed lightened and simplified methods for the Wraith III rear end suspension.
| Identifier | ExFiles\Box 9\5\ 05-page239 | |
| Date | 1st March 1939 | |
| Handwritten: H/HH, P.L, S.Lee, 646? Stamped: Ex/Ex, c. Rm.{William Robotham - Chief Engineer}, c. De/Des Da.{Bernard Day - Chassis Design}14/G.1.3.39. WRAITH 111 - REAR END SUSPENSION. Please receive herewith G.CD.1210 and G.CD.1216 shewing the proposed lightened and simplified method of taking the torque at the rear engine suspension, based on experiments made on Wraith, which appear to have been so far successful. The advantages of fewer and lighter pieces are additional to reduced movement of the gear lever due presumably to a raised centre line of oscillation. G.CD.1216 shews the form very similar to the experiment, which has been tried. We fear the rigid pin at the inner end may develop slack, and the method of attaching the plate bracket under the existing cover studs appears to be large and heavy for what it has to do. It has, however, the advantage of not altering the existing gearbox casting. G.CD.1210 avoids the slack in the inner joint, but requires additional bosses on the gearbox casting. We suggest that G.CD.1216 should be tried first, on an existing car, and its defects, if any, shewn up before trying G.CD.1210. The outer rubbers and their bracket, and the brake shaft bracket, are the same in both schemes, the brake shaft bracket being that now existing on the R.H. side. In both schemes the lower part of the suspension is that now existing on Wraith, except that the torque-taking rubbers with their brackets are removed and the channel replaced by a flat plate. The existing cross member is shewn, but if it is possible to produce cross members of .104 thickness without getting new tools, the saving of weight would make it worth while, but not otherwise. DA.{Bernard Day - Chassis Design} | ||