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).
Design policy and component choices for frames, springs, and roll rods.
| Identifier | ExFiles\Box 148\2\ scan0148 | |
| Date | 27th March 1939 | |
| Da. {Bernard Day - Chassis Design} 14/G.27.3.39. Allocated to Da {Bernard Day - Chassis Design} /JD. {J. Draper - Frames} FRAMES. It seems doubtful whether the bent front pan on all models is the best policy. ROY {Sir Henry Royce} /Les. will endeavour to obtain a comparative cost between the bent and straight types (I understand rather a difficult thing to do) and then if some idea can be formed of the relative quantities of the models, it should be possible to formulate a policy. Against the exclusive use of the bent type has to be set the fact that a complete set of tools for the straight type is being made, and must be used for B.V. Tools are also being made for the suspension levers going with the straight pans. Tools must be ordered for the bent pan and for the levers going with it, but the latter could be made to go with the straight pan, which, of course, means new tools for the latter. From the list of models at the head of Da {Bernard Day - Chassis Design} /EV. {Ivan Evernden - coachwork} 5/N. 1.3.39. there would appear to be four models which must have bent pans, and five models which could have straight ones. The relative quantities of these models seems an important consideration in arriving at a policy based on cost. The other question to be settled is the cross to be used. We have already begun to investigate the single piece propeller shaft, and should in about 10 days be able to say whether this shaft could be used on all models without some great sacrifice. If this point is not considered part of the rationalised programme, then there is no drawing to be done. Whether it should or not seems to depend on the results of our investigation in the next few days. REAR SPRINGS. The adaption of 56 springs to the B.V. type of frame does not present much difficulty, and affects mostly the rear axle tubes. Very little drawing to be done. Details giving the 59" track suitable for this spring now in hand. ROLL RODS. Front Roll Rods, no drawing required. Rear Roll Rods. This is tied up with the petrol tank. If, as seemed to be indicated the other day, we wish to go in for a B.V. or B.50 type tank, there is no drawing to be done. In this | ||