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).
Report page concluding tests on a damper, comparing its performance and suggesting future developments.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 153 | |
| Date | 1st April 1927 guessed | |
| contd :- -6- temperature or viscosity. We find that this is not the case either with the high or low pressure end as is shewn in Graphs. lV. and V.{VIENNA} As we have no explanation for this we have repeated the tests a number of times and have used other oils having somewhat greater viscosity than the std. shock damper oil. The results, however, all shew that this variable load produced by velocity is substantially unaffected by any oil viscosity variations we are likely to encounter. We thought that the valve lift might vary largely with the oil viscosity and account for the result, but Graph Vl.{V. Lewis / Mr Valentine} shews that this is not the case. (F) CONCLUSIONS FROM THE TESTS. A summary of the results of the tests shews that the RR. damper is highly desirable because, apart from its attribute of consistency which the Hartford lacks, it produces damping which is proportional to the amount of damping required. This means that it allows good low speed riding and yet does not allow the car to get out of control at high speeds, facts that we have already appreciated. Additionally, its efficiency is maintained very well under all working conditions of speed and temperature. The directions of development which naturally suggest themselves are :- (a) By alteration to the low pressure passages, increase the gain in low pressure damping with high axle velocities. (b) Alter the passages of the rear damper so that a gain in damping equivalent to that obtained on the front for any axle velocity will be produced in this position in spite of the longer levers employed which produce a lower piston velocity. contd :- | ||