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).
Set of six graphs comparing performance at various RPMs under different high and low pressure and venting conditions.
| Identifier | ExFiles\Box 105\3\ scan0300 | |
| Date | 11th November 1935 guessed | |
| 13 90/90 LB. 1" STROKE. HIGH PRESS. NO BEARING VENT. R.P.M. 540 360 180 90 308 LB/D" 120" I.S. 14 90/90 LB. 1" STROKE. HIGH PRESS. WITH BEARING VENT OPEN R.P.M. 540 360 180 90 308 LB/D" 120" I.S. 15 90/90 LB. 1" STROKE. HIGH PRESS. PISTON VENTS. .032 x .032" NO BEARING VENTS. R.P.M. 540 360 180 90 308 LB/D" 120" I.S. 16 90/90 LB. 1" STROKE. LOW PRESS WITHOUT BEARING VENTS. R.P.M. 540 360 180 90 308 LB/D" 120" I.S. 17 90/90 LB. 1" STROKE. LOW PRESS. WITH BEARING VENTS R.P.M. 540 360 180 90 308 LB/D" 120" I.S. 18 90/90 LB. 1" STROKE. LOW PRESS. WITH PISTON VENTS. .032" x .032" R.P.M. 540 360 180 90 308 LB/D" 120" I.S. | ||