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).
Page discussing the principles and superiority of a damper system over friction dampers.
| Identifier | ExFiles\Box 28\1\ Scan092 | |
| Date | 22th June 1926 | |
| -15- Hs{Lord Ernest Hives - Chair}/Rml/T22.6.26. a means of ejecting any air which may get behind the piston and cause lost movement, and a filter to clean the oil before it enters the high or low pressure chamber. Road tests have shewn that this damper is superior in its action to any friction damper in - (1) Preventing high speed wobbles. (2) Preventing large rapid movements of the axle such as pitching and rebound over humped-backed bridges. This is because, though the viscosity of the oil has little effect upon its operation due to the relatively large size of the valve ports, the resistance to the motion of the piston is very much greater when the oil velocity through the ports is large than when it is small, due to the loss of energy occasioned by forcing a liquid rapidly through an unstreamlined orifice. (See principles of oil flow (1) under "Houdaille" shock absorbers, page 9.) Contd. | ||