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).
Suggested experiments on car braking systems, including efficiency, cooling, clearances, handbrakes, and rear equalisers.
| Identifier | ExFiles\Box 152\2\ scan0271 | |
| Date | 4th November 1940 | |
| Rm{William Robotham - Chief Engineer}/MHR.{M. H. Rigby}S/ET.4.11.40 - 3 - Suggested experiments are:- I. Efficiency curves for wedge pressures against pedal loads on 1-R-1 and 12-B-V, these two cars representing respectively bad and good rear lining wear and braking generally. II. Cooling tests on 2 rib drums as used on 12-B-V, and also on scrap drums off 30-G-VII, with all fins removed. 3. Clearances of pins and levers. Most of the cars have all their pins and lever clearances increased, and pins and plate levers are plain, dull nickel plated and chromium plated (see chart for details), and verdict can be passed this winter. 4. Handbrake. None of the cars has a correct Bowden wire operated hand-brake, although 10-B-V has a "mock-up" tubular lever with this type of operation. The parts are available for making one, except for the machining of one piece. It was the original "mock-up" wire operated lever that failed on 30-G-VII. 5. Rear Equaliser. The rear equaliser allows more braking on the off-side than on the near-side, due to a geometry which causes the whole equaliser to be pushed towards the nearside. Comparative figures have been obtained for 10-B-V and 4-B-50, and we should like to obtain similar figures from a third car. We have an undrilled equaliser which can be drilled to new centres to compensate for the geometry which cannot simply be corrected; and the equaliser can then be tried out to compare the rates of wear. Rm{William Robotham - Chief Engineer}/MHR.{M. H. Rigby} | ||