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).
Performance graphs for J III Rear component under various pressure, temperature, and run conditions.
| Identifier | ExFiles\Box 179b\2\ img097 | |
| Date | 18th October 1932 | |
| Graph 1: J III REAR. 90/90 LB. LOW PRESSURE .250 HAT .005 CLEARANCE PISTON VENTS .032 x .032 4" STROKE 60°C R.P.M: 250, 180, 135, 90, 45, 22 Y-Axis: 308 LB/D" - 133 LB B.P. Diagram: 2 Graph 2: J III REAR. 90/90 LB HIGH PRESSURE 1ST RUN UP .250 HAT .005 CLEARANCE PISTON VENTS .032" x .032 4" STROKE 25-30°C. R.P.M: 250, 180, 135, 90, 45, 22 Y-Axis: 308 LB/D" - 133 LB B.P. Diagram: 4 Graph 3: J III REAR. 90/90 LB HIGH PRESSURE .250 HAT .005 CLEARANCE PISTON VENTS .032 x .032 4" STROKE AFTER RECOOLING R.P.M: 250, 180, 135, 90, 45, 22 Y-Axis: 308 LB/D" - 133 LB B.P. Diagram: 6 | ||