Performance graphs for a Double Piston Damper under high and low pressure conditions.
| Identifier | ExFiles\Box 56\1\ Scan148 | |
| Date | 10th June 1931 | |
| TOP SECTION: 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 0-3LB/D" 10" LEVER. LEFT AXIS: 32 LB/IN. BALL PIN LOAD. 120" I.S. RIGHT AXIS: 308 LB/D" TABLE: SYL. 30 LB/D" | B.P. 285 LB. " 25 " | " 255 " " 20 " | " 223 " " 15 " | " 185 " " 10 " | " 148 " " 6 " | " 114 " " 0 " | " 87 " BOTTOM SECTION: 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 LEFT AXIS: 120" I.S. RIGHT AXIS: 308 LB/D", 132 LB/IN BALL PIN LOAD. TABLE: SYL. 30 LB/D" | B.P. 251 LB " 25 " | " 226 " " 20 " | " 198 " " 15 " | " 170 " " 10 " | " 143 " " 6 " | " 116 " " 0 " | " 92 " STAMP (partially legible): R-R LTD DERBY | ||
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).