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).
Power curve data for a Phantom II No.7 large bore unit with a semi-expanding carburettor at different float levels.
| Identifier | ExFiles\Box 13\4\ 04-page167 | |
| Date | 12th September 1933 guessed | |
| POWER CURVES ON P.II. NO.7 LARGE BORE UNI. WITH SEMI-EXPANDING CARB. Standard Float 1.050" Level - Barom. 753. R.P.M. | LOAD. | C/LOAD. | B.H.P. | B.M.E.P. | CONS. Pts/Hr. | Pts/BHP/Hr | Air Temp. | Ind. Pipe Dep 3250 | 100.0 | 103.2 | 140.0 | 68.6 | 98.0 | .708 | 270 | 2.75 3000 | 115.5 | 118.9 | 143.7 | 79.0 | 96.0 | .667 | 260 | 2.70 2750 | 124.5 | 128.2 | 147.0 | 85.2 | 92.0 | .643 | 260 | 2.40 2500 | 132.5 | 136.7 | 142.3 | 90.8 | 86.5 | .653 | 270 | 2.00 2000 | 141.5 | 146.4 | 122.0 | 97.3 | 73.3 | .622 | 290 | 1.45 1500 | 149.0 | 154.3 | 96.4 | 102.6 | 57.5 | .618 | 300 | .85 1000 | 150.5 | 155.8 | 65.0 | 103.4 | 41.0 | .653 | 290 | .60 750 | 149.5 | 155.0 | 48.4 | 103.0 | 32.5 | .697 | 300 | .50 Lightened Float 1.375" Level - Barom. 757 3250 | 99.0 | 102.2 | 138.5 | 68.0 | 96.8 | .723 | 300 | 2.85 3000 | 114.5 | 118.5 | 148.0 | 78.7 | 94.8 | .652 | 320 | 2.65 2750 | 123.0 | 127.4 | 146.0 | 84.7 | 91.0 | .645 | 320 | 2.25 2500 | 133.0 | 137.2 | 143.0 | 91.2 | 86.3 | .624 | 300 | 2.05 2000 | 143.5 | 148.0 | 123.4 | 98.4 | 72.0 | .603 | 290 | 1.40 1500 | 149.0 | 154.0 | 96.4 | 102.2 | 56.2 | .603 | 310 | .85 1000 | 153.5 | 158.4 | 64.0 | 105.0 | 41.0 | .642 | 300 | .60 750 | 151.0 | 155.6 | 48.7 | 103.2 | 35.3 | .747 | 290 | .50 | ||