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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"
  
  


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