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).
Comparison table of physical properties and inertia calculations for EAC and 40/50 HP components.
| Identifier | ExFiles\Box 74\2\ scan0298 | |
| Date | 2nd July 1919 guessed | |
| || EAC. | 40/50 HP. | |---|---|---| | DISTANCE BETWEEN SUPPORTING WIRES. | 1.166 ft. | 1.166 ft. | | LENGTH OF WIRES. | 6.644 ft. | 6.839 ft. | | WEIGHT OF FLYWHEEL COMPLETE WITH CLUTCH. | 168.25 lbs. | 114.44 lbs. | | TIME FOR 30 OSCILLATIONS. | 75.6 secs. | 82.0 secs. | | . TIME FOR 1 OSCILLATION . | 2.52 secs. | 2.73 secs. | | (RAD. OF GYRATION)2 OR K2. | .265 ft2 | .303 ft2. | | .. RAD. OF GYRATION. | .514 ft. | .550 ft. | | MOMENT OF INERTIA = W/g K2 = | 1.385 units. | 1.076 units. | Hs{Lord Ernest Hives - Chair}/ACL. | ||