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 summarising the results of a third series of tests carried out on a standard damper with altered pressure passages.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan041 | |
| Date | 1st June 1928 guessed | |
| contd :- -3- is all the more satisfactory. A third series of tests were carried out with a standard damper, the only alteration to which was a reduction in the bore of the high and low pressure passages. We cannot explain why the high pressure loading is effected more by temp. for 11" axle movements than oscillations of of smaller amplitudes nor why the low pressure is effected more by temp. at low velocities. The low pressure varies rather unpleasantly for small axle movements, and one would fear harsh riding in cold weather if any considerable pressure velocity factor were introduced as a simple narrow bore passage. Summarising the tests - staggered passages clearly are capable of giving the best results, plain narrow bore passages, however, are reasonably good if a large pressure velocity increase is not aimed at. A further advantage of staggered restrictions is that they can be made large to obviate the danger of their becoming blocked up. We feel that if the present damper piston could have an off-set restriction inserted at the end of each passage it would improve our low pressure loading characteristic. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||