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).
Data tables for front, rear shock absorbers, and axle control specifications.
| Identifier | ExFiles\Box 55\4\ Scan243 | |
| Date | 21th April 1928 guessed | |
| FRONT SHOCK ABSORBERS 7-1/2" ARM 1.750 INT. LEVER H.P. Valve: Area = .0764 in^2 LOAD ON BAL | OIL PR.{Percy H. Rose} TO OPEN VALVE | VALVE-SPRING LOAD 20# | 36 | 2.75 40 | 71 | 5.50 60 | 107 | 8.25 80 | 143 | 11.0 100 | 179 | 13.75 L.P. Valve: Area = .196 in^2 20 | 36 | 7.00# 40 | 71 | 14.00 60 | 107 | 21.00 80 | 143 | 28.00 100 | 179 | 35.00 REAR SHOCK ABSORBERS 13" ARM 1.750 INTER. LEVER H.P. Valve: Area = .0764 in.^2 20 | 62 | 4.75 40 | 124 | 9.50 60 | 186 | 14.25 80 | 248 | 19.00 100 | 310 | 23.75 L.P. Valve: Area = .196 in.^2 20 | 62 | 12.00 40 | 124 | 24.25 60 | 186 | 36.50 80 | 248 | 48.50 100 | 310 | 60.75 AXLE CONTROL S.A. 13.950 ARM 2.625 INRER. LEVER H.P. Valve: Area = .0764 in^2 20 | 44 | 3.50 40 | 89 | 6.75 60 | 133 | 10.25 80 | 178 | 13.50 100 | 222 | 17.00 L.P. Valve:=Area .196 in.^2 20 | 44 | 8.75 40 | 89 | 17.50 60 | 133 | 26.00 80 | 178 | 34.75 100 | 222 | 43.50 | ||