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 final 10,000-mile road test and bench examination of controllable shock dampers for the 22-EX model.
| Identifier | ExFiles\Box 16\5\ Scan173 | |
| Date | 29th December 1933 | |
| File To Sg.{Arthur F. Sidgreaves - MD} From Hm{Capt. W. Hallam - Head Repairs}/Lee. c. to Nor. c. to E.{Mr Elliott - Chief Engineer} c. to Hy.{Tom Haldenby - Plant Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Hiv. c. to Ex. c. to EE. X7520. Report on Controllable Shock Dampers 10,000 miles, 22-EX. After a final test on the road the whole damper mechanism was removed from the car for testing and examination on the bench. The Final Road Test. No depreciation in the system was discernible. For high speed touring the system is a long way in advance of our fixed load dampers. We are however convinced that a great deal of improvement can still be made to the riding of the car without adversely affecting the controllability of the car. Governor System. The oil pressures for the following items remained consistent :- governor range, steering column control range, and the main release valve. All valves in the unit operated satisfactorily and were good for holding pressure in the system when the car was stationary. A faint wheezing noise was audible from the main release valve at low speeds, only when the control was in the very max. position. Production cars have been arranged so that the main release valve does not operate until 50 m.p.h. After 8,000 miles it was found that the square shaft which drives the governor unit and the speedometer drive had twisted badly from excessive load. This was due to the speedometer drive getting trapped by the clutch pedal. R.Sch.3923 has been designed so that if the speedometer drive gets trapped it will itself break rather than break the square shaft, and put the damper out of action. We shall be testing this experimentally. | ||