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 the principles and performance of different shock absorber valves.
| Identifier | ExFiles\Box 170\2\ img050 | |
| Date | 12th June 1931 | |
| Detroit. June 12/31 X832. My dear Riv. Thank you for your notes on shock absorber testing. The Spicer sh. abs. which has a delivery valve consisting of a hole in a ground plate with a ground spring steel plate bearing against it, much like a mechanical version of the old bellows valve, is said to have virtually no viscosity effect with a straight line velocity characteristic. It is the opposite of the sleeve-type Delco valve in principle. Why it should have no viscosity effect is not understood. Perhaps it is due to increased pressure area with increased viscosity, or it may be due to producing discontinuous flow. Anyway I thought you would be interested in buying and testing one. The cavitation effects in this shock, which has atmospheric filling, are said to be very bad. Yours, Maurice Olley | ||