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).
Comparison of performance graphs for a 20 HP rear damper under various configurations and pressures, Sheet I.
Identifier | ExFiles\Box 105\3\ scan0149 | |
Date | 3rd January 1931 guessed | |
SHEET I Col: I 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .010" H.P. VALVE DRILLED .055" DIA. 450 R.P.M. 1" STROKE 25°C. Graph values: 1.23 D", 54.6%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. LIFT .010" H.P. VALVE DRILLED .055" DIA. 450 R.P.M. 1" STROKE 25°C. Graph values: 54.5%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 72.9%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 2.1 D", 53.1%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 70 R.P.M. 4" STROKE 25°C. Graph values: 4.12 D", 78.2%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .055" DIA. 70 R.P.M. 4" STROKE 25°C. Graph values: 3.46 D", 75.4%, Y-Axis: 154 LB/D" Col: II 20 H.P. REAR 65/75 LB. LOW PRESSURE AIR VENT BALL REMOVED. DAMPER FILLED TO STD. LEVEL. 450 R.P.M. 1" STROKE 25°C. Graph values: 1.17 D", 50%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE AIR VENT BALL REMOVED. DAMPER FILLED TO STD. LEVEL. 450 R.P.M. 1" STROKE 25°C. Graph values: 1.4 D", 50.2%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 86%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 3.57 D", 85.5%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD. 70 R.P.M. 4" STROKE 25°C. Graph values: 4.71 D", 88.4%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE AIR VENT BALL REMOVED. OIL LEVEL STANDARD. 70 R.P.M. 4" STROKE 25°C. Graph values: 4.07 D", 88.2%, Y-Axis: 154 LB/D" Col: III 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE 25°C. Graph values: .87 D", 38.3%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE 25°C. Graph values: 1.05 D", 39.3%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 3.23 D", 69.5%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 3.07 D", 75.9%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE 25°C. Graph values: 4.12 D", 77.8%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .004" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE 25°C. Graph values: 3.8 D", 82.7%, Y-Axis: 154 LB/D" Col: IV 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STANDARD LIFT H.P. VALVE DRILLED .032" DIA. 450 R.P.M. 1" STROKE 25°C. Graph values: 1.31 D", 55%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE STANDARD 450 R.P.M. 1" STROKE 25°C. Graph values: 1.24 D", 45.4%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 3.42 D", 84.4%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 4.00 D", 85%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE 25°C. Graph values: 3.91 D", 85%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE DRILLED .032" DIA. 70 R.P.M. 4" STROKE 25°C. Graph values: 4.46 D", 84%, Y-Axis: 154 LB/D" Col: V 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. LIFT .010" NO HOLE IN H.P. VALVE 450 R.P.M. 1" STROKE 25°C. Graph values: 1.01 D", 47.1%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. LIFT .010" NO HOLE IN H.P. VALVE 450 R.P.M. 1" STROKE 25°C. Graph values: .99 D", 43%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 3.48 D", 85.5%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 130 R.P.M. 2 1/2" STROKE 25°C. Graph values: 4.05 D", 86.0%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. LOW PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 70 R.P.M. 4" STROKE 25°C. Graph values: 4.13 D", 90%, Y-Axis: 154 LB/D" 20 H.P. REAR 65/75 LB. HIGH PRESSURE .025" DIA. AIR VENT. STD. LIFT .050" H.P. VALVE NOT DRILLED 70 R.P.M. 4" STROKE 25°C. Graph values: 4.84 D", 91.0%, Y-Axis: 154 LB/D" | ||