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).
Calculations for volume displacement and gas velocities for a 260 cu.in engine with various pipe configurations.
| Identifier | ExFiles\Box 127\2\ scan0162 | |
| Date | 20th January 1941 guessed | |
| 3½ x 4½ Engine (260 cu.in) Volume displaced at 1000 R.P.M. = (260 x 1000) / (12³ x 2 x 60) = 1.25 cft/sec. ---------------- Smallest Stromberg pipe used = 1.4" dia - Gas vel = 117 ft/sec. (with single carb.) Standard Wraith pipe 1.6" dia - Gas vel = 89.4 ft/sec. Centre 4 cyls. of 3 S.U. B.80 1.6" dia - Gas vel = 59.7 ft/sec. ---------------- Rover file 1091 | ||