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 performance of various hydraulic damper configurations after a 500-mile test.
| Identifier | ExFiles\Box 5a\3\ 03-page272 | |
| Date | 7th June 1933 | |
| X5840. Hotel de France. Chateauroux. Indre. 7.6.33 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. 18. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} IV. HYDRAULIC DAMPERS. The position of the Hydraulic dampers are as follows: As fitted up 5/6/33 N.S.F. New damper with vee shaped bronze washer O.S.F. New asbestos gland impregnated with tallow and large air capacity cover fitted. N.S.R. Air vent drilled communicating gland cover with body of damper. Wedge shaped bronze washer, but filed leading edge .100 back and asbestos gland impregnated with tallow. Our scheme No2. O.S.R. Air vent stopped up. Wedge shaped bronze washer, asbestos gland impregnated with tallow. ALL DAMPERS Drilled valves stopped up and washers fitted under valves to give a definate leak. Rears .025 Front .020, load of dampers as per specification 70 lbs up 70 lbs down. RESULT AFTER 500 MILES N.S.F. lost 11 cc. O.S.F. lost 3 to 4 cc. N.S.R. lost 3 to 4 cc. O.S.R. lost 3 to 4 cc. not so good as with vent. These are being given a further run to-day after being topped up with oil. | ||