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).
Braking performance with varied radius rod ball positions.
| Identifier | ExFiles\Box 73\2\ scan0066 | |
| Date | 27th October 1923 | |
| EXPERIMENTAL REPORT. Expl. No. 9940 REF: HES/LG27.10.23. (1) 2" below centre of radius rod ball on axle. (2) 3½" below centre of radius rod ball on axle. (3) 6½" below centre of radius rod ball on axle. These three positions give three graduations of take-off as the brakes are applied in a forward direction. Performance. Position (1) Braking forward good, it being reasonably easy to lock the wheels. Braking backwards definitely good. Wheels could be locked. It was impossible to get the jaggering previously experienced. The steering on corners was much less objectionable than in test (a) though when the wheels were on the point of locking, it took charge. Position(ii) Much the same as (1) only slightly less powerful in a forward direction. Position(iii) Braking in a forward direction very poor, it being impossible to lock the wheels. Braking on reverse good but not particularly violent. The pedal could be felt distinctly to force itself up against the foot as the axle twisted, we got no jaggers in either direction. Causes. Varying our point of application therefore produced the expected result with the exception that in (iii) we did not get the jaggers and violent braking we expected on reverse. It appears that the large pulling-on movement in this case is transmitted more to the pedal than the brakes. Test (c). Removing the shoes tending to be pushed off by the drum to see if the jaggers were eliminated. Performance. Braking forward good - no jaggers. Braking reverse useless. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||