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).
Difficulties of testing and improving vehicle suspension systems and ride quality.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan014 | |
| Date | 16th April 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BJ. RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to EY. Na.{Mr Nadin} c. to Wor.{Arthur Wormald - General Works Manager} ORIGINAL 44048 X8410 X832 SUSPENSION. We have now done a certain amount of work on this subject which has enabled us to ascertain some of the difficulties with which we are confronted. The main trouble which we have so far experienced is the unreliability of physical sensations as a means of measuring small differences in the riding qualities of cars. We find that while it is comparatively easy to detect a difference when the shock damper setting front or rear is altered 50 lbs., the main reason is because the alteration can be made with great rapidity, and the exact impressions of the feel of one test can be retained while the second test is being conducted. In the alteration of spring strengths, however, a considerable period must necessarily elapse between any two comparisons, and as a result the greatest difficulty is experienced in correctly estimating the value of any improvement. In comparing different cars the main trouble is to separate the characteristics of the coachwork and upholstery from that of the suspension system. Rattles, poor seating position and unsatisfactory cushions are all capable of masking the benefits of good suspension. With regard to the exact complaint with which we are at present dealing, i.e., the riding of the car on slightly wavy but relatively smooth roads at speeds between contd :- | ||