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).
Adjustment of hydraulic dampers to improve the ride quality on a 25 HP chassis with low rating springs.
| Identifier | ExFiles\Box 106\1\ scan0330 | |
| Date | 4th October 1932 | |
| X5410. PN.{Mr Northey}7/W4.10.32. X5520 S/W. Hs.{Lord Ernest Hives - Chair}..... from PN.{Mr Northey} Copy to Wor.{Arthur Wormald - General Works Manager} Sg.{Arthur F. Sidgreaves - MD} Cx.{Major Len W. Cox - Advertising Manager} Mx.{John H Maddocks - Chief Proving Officer} T. Br.{T. E. Bellringer - Repair Manager} 25 H.P. Hydraulic dampers. I have formed the impression from time to time that cars having the same low rating type of spring appear to differ quite widely in the amount of damping afforded by the shock-absorbers as evidenced by not only swinging of the car when stationary but a tendency to swing at corners, and especially to throw passengers seated in the rear of the car up to the roof on an undulating road or a humpback bridge. Our trials car 20-G.4 which now appears to give considerable satisfaction in regard to its springing was not satisfactory from this point of view until the holes in the high pressure valves of the hydraulics were filled up. Recently, a lady who had been given a run on the Park Ward Trials Car (CAU-48) complained that the springing was altogether too flexible, but she entirely approves of the springing of our own car - 20-G4, referred to above. Yesterday at N. I arranged for the hydraulics of the Park Ward car to be examined. They were found to be set for the full loading provided by standard i.e. - front 100 to 90, rear 120 to 95, and in the front dampers the H.P. valves had one hole .046, the rear dampers had two holes .044. These were filled up at N. as in the case of 20-G4, and it was stated that the springing as a result of this was altogether more satisfactory. What I want to know is what is the standard in this respect for 25 H.P. chassis having low rating spring? If N. was correct in filling these up in order to effect a required improvement then it could not have been right to have the holes in the first place. What is the position please? PN.{Mr Northey} | ||