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).
Six indicator diagrams comparing performance at high and low pressure with different vent configurations.
| Identifier | ExFiles\Box 179b\2\ img100 | |
| Date | 18th October 1932 guessed | |
| Chart 13: 90/90 LB. 1" STROKE. HIGH PRESS No BEARING VENT. R.P.M 540 360 180 90 Chart 14: 90/90 LB. 1" STROKE. HIGH PRESS WITH BEARING VENT OPEN R.P.M 540 360 180 90 Chart 15: 90/90 LB. 1" STROKE. HIGH PRESS PISTON VENTS .032 x .032" No BEARING VENTS. R.P.M 540 360 180 90 Chart 16: 90/90 LB. 1" STROKE. LOW PRESS WITHOUT BEARING VENTS R.P.M 540 360 180 90 Chart 17: 90/90 LB. 1" STROKE. LOW PRESS. WITH BEARING VENTS R.P.M 540 360 180 90 Chart 18: 90/90 LB. 1" STROKE. LOW PRESS WITH PISTON VENTS .032 x .032" R.P.M 540 360 180 90 Axis Labels (common to all charts): Y-Axis: 308 LB/D" X-Axis: 120' 1.S. | ||