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).
Three performance graphs for a 90/90 lb 2-inch stroke low-pressure engine under various temperature conditions.
| Identifier | ExFiles\Box 179b\2\ img099 | |
| Date | 18th October 1932 guessed | |
| Graph 10: 90/90 LB. 2" STROKE. LOW PRESS. COLD - 25°C ATMOSPHERIC INLET ON EACH SIDE OF "HAT" B.P. LOAD 140 LB DROPPING TO 110 LB .250 HAT .005 CLEARANCE Y-Axis: 308 LBS/sq" X-Axis: 120' I.S. R.P.M: 360, 260, 180, 90 Graph 11: 90/90 LB. 2" STROKE. LOW PRESS 60°C ATMOSPHERIC INLET ON EACH SIDE OF "HAT" Y-Axis: 308 LBS/sq" X-Axis: 120' I.S. R.P.M: 360, 260, 180, 90 Graph 12: 90/90 LB. 2" STROKE LOW PRESS. AFTER RE-COOLING ATMOSPHERIC INLET ON EACH SIDE OF "HAT" Y-Axis: 308 LBS/sq" X-Axis: 120' I.S. R.P.M: 360, 260, 180, 90 | ||