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).
High-speed tests comparing the riding performance of hydraulic and standard friction dampers on various car models.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan028 | |
| Date | 5th July 1926 | |
| Contd. -3- Hs{Lord Ernest Hives - Chair}/Rml/T15.7.26. We are quite aware that this slow speed work makes shock dampers appear unnecessary, and in order to shew up the relative merits of suspensions and dampers we are endeavouring to get out a high speed test over bad roads. Graph I shews the riding with various dampers. The hydraulic damper at 75 and 35 lbs. gives slightly worse riding, as might be expected, than the standard friction dampers at 27 lbs. Graph IV, however, shews that this will probably be compensated for by the lower tyre pressures which the hydraulic damper makes possible. We were unable to detect any improvement due to vertical shackles at the front. Vertical shackles at the rear, however, seem to tend to slightly better riding (Graph III). The riding of the front of the 20 HP. with standard dampers is appreciably better than that of the 40/50. (Graphs I & V). We have done one or two further tests on the riding at the back of the car. These indicate that though EAC.I. is better than the Phantom it will hardly be as good as the 20 HP. The riding in the front seats of EAC.I. appears to be very good. (Graph V). Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||