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).
Graph comparing engine torque between cast and machined combustion chambers.
| Identifier | ExFiles\Box 124\3\ scan0285 | |
| Date | 18th January 1935 guessed | |
| G.M.C CORRECTION TO 103 °F FT. LBS. TORQUE CAST COMBUSTION CHAMBERS MACHINED COMBUSTION CHAMBERS ENGINE TORQUE REVOLUTIONS PER MINUTE 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 90 80 70 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 200 400 600 800 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 | ||