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).
The viscosity of 'Price's Motorine C' oil and its impact on the performance of Houdaille shock absorbers.
| Identifier | ExFiles\Box 28\1\ Scan087 | |
| Date | 22th June 1926 | |
| -10- Hs{Lord Ernest Hives - Chair}/Rul/T22.6.26. Price's Motorine "C". It will be observed that at 10°C [GRAPH: VISCOSITY CURVE. PRICE'S MOTORINE C. Y-axis: OIL TEMP. °C, from 10 to 40. X-axis: TIME FOR OIL TO FLOW THROUGH AN ORIFICE SECS OR VISCOSITY. from 0 to 5000. The curve shows viscosity decreasing as temperature increases.] the viscosity of this oil is some five times that at 40°C. Now the shock absorber is cooled by the air and hence its temperature will vary with that of the atmosphere. (See notes on Radiators). In England the variation in atmospheric temperatures usually encountered is at least 25°C. Therefore, even with the most suitable oil the damping effect of a Houdaille with any given setting will be at least four times as great in mid-winter as in mid-summer which is obviously most unsatisfactory, it being quite impossible to adjust the shock absorber daily to suit the weather. The two other main objections to the Houdaille are - Contd. | ||