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).
Performance graphs for a Double Piston Damper at high and low pressures.
| Identifier | WestWitteringFiles\W\May1931-August1931\ Scan055 | |
| Date | 10th June 1931 | |
| DOUBLE PISTON DAMPER. HIGH PRESSURE. 10.6.31. MASKED VALVE - .010" CLEARANCE - .025" DIA. H.P. VALVE LEAK. VALVE SPRING 200 LB/IN (APPROX) 4" STROKE. 70 R.P.M. SYLPHON PRESSURES 0-3 LB/D" 10" LEVER. 32 LB/IN BALL PIN LOAD 308 LB/D" 120" I.S. SYL. 30 LB/D" B.P. 285 LB " 25 " " 255 " " 20 " " 223 " " 15 " " 185 " " 10 " " 148 " " 6 " " 114 " " 0 " " 87 " DOUBLE PISTON DAMPER. LOW PRESSURE. 10-6-31 MASKED VALVE - .010" CLEARANCE - .025" DIA. H.P. LEAK. VALVE SPRING 200LB/IN (APPROX) 4" STROKE. 70 R.P.M. SYLPHON PRESSURES 0-30 LB/D" 10" LEVER 120" I.S. SYL. 30 LB/D" B.P. 251 LB " 25 " " 226 " " 20 " " 198 " " 15 " " 170 " " 10 " " 143 " " 6 " " 116 " " 0 " " 92 " 308 LB/D" 132 LB/IN BALL PIN LOAD | ||