Performance graphs for a Double Piston Damper under various pressure and spring configurations.
| Identifier | ExFiles\Box 56\1\ Scan132 | |
| Date | 1st June 1931 guessed | |
| Top Left Graph: 14 DOUBLE PISTON DAMPER - LOW PRESSURE 4" STROKE. MASKED VALVE. .010 CLEARANCE - LIGHTENED .025 DIA. HOLE IN H.P. VALVE. LIGHT VALVE SPRINGS. 3 x 8 LBS 70 R.P.M. 150 " 308 LB/IN 120 I.S. Top Right Graph: 13 DOUBLE PISTON DAMPER HIGH PRESSURE 4" STROKE. MASKED VALVE. .010 CLEARANCE, LIGHTENED. .025 DIA. HOLE IN H.P. VALVE. LIGHT VALVE SPRINGS. 3 x 8 LBS 70 R.P.M. 150 R.P.M. 308 LB/IN 120 I.S. Bottom Left Graph: DOUBLE PISTON DAMPER - LOW PRESSURE MASKED VALVE - .010 CLEARANCE. 8 LB. 200 LB/IN RATING SPRING. QUIET 150 R.P.M. 70 " 308 LB/IN 120 I.S. Bottom Right Graph: DOUBLE PISTON DAMPER. HIGH PRESSURE. MASKED VALVE. .010 CLEARANCE. 8 LB. 200 LB/IN RATING SPRING. QUIET 150 R.P.M. 70 " 308 LB/IN 120 I.S. | ||
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).