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).
Letter discussing damper orifice regulation and ride quality, including a graph of oil pressure versus velocity.
| Identifier | ExFiles\Box 170\2\ img102 | |
| Date | 18th October 1931 | |
| Detroit. October 18/31 Dear RW, I have not replied to yours of Sep 15 before, because the matter was not fully worked out. The trouble with orifice-regulation of dampers appears to be that the freer settings give an unstable ride. Suppose one draws a diagram of oil-pressure against oil-velocity thus:- [Graph showing Oil Pressure vs{J. Vickers} Oil Velocity] Graph Labels: OIL PRESSURE OIL VELOCITY no orifice Quick build up slow build-up A, B, C effects of increasing orifice 1, 2, 3, 4, 5 successive positions of spring control. Oil velocity for usual axle movements Oil velocity for usual car movements Opening orifice to regulate the shocks does not necessarily give a smoother ride, because while the car movements are not sufficiently damped, the axle movements shake the car almost as much as without orifice. In fact, in the case of lubricated springs and | ||