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).
Explanation with diagrams of torque impulses and the smoothening action of flywheels and pendulum wheels.
| Identifier | ExFiles\Box 41\4\ Scan041 | |
| Date | 21th September 1931 guessed | |
| Page 12 SPONTAN Fig. 5 shows how the positive and negative torque impulses are smoothed down by the propeller shaft flywheel and the pendulum wheel respectively. Positive torque impulses on propeller shaft flywheel. Revolutions of engine. Negative torque impulses on pendulum wheel. Fig. 4. Starting torque impulses. Torque impulses on propeller shaft flywheel. Smoothened torque on propeller shaft. Revs. of eng. Torque impulses on pendulum wheel. Smoothened torque on spring anchor. Fig. 5. Smoothening action of flywheels. We will next assume the brakes to be released and the engine speeded up. As the centrifugal forces increase at a much higher rate than the engine speed (being proportional to the square of that speed) the turning moment created by 12 Page 13 SPONTAN the rotary weights will soon be powerful enough to turn the main sleeve, and the car starts smoothly. The rotation of the main sleeve is, for a start, not uniform, Positive torque impulses on propeller shaft flywheel. Revs. of eng. Negative torque impulses on pendulum wheel. Fig. 6 Torque impulses. Propeller shaft running at half speed of engine. Torque impulses on propeller shaft flywheel. Actual torque on propeller shaft. Direct engine torque. Revs. of eng. Torque impulses on pendulum wheel. Torque on spring anchor. Fig. 7. Various torques. Propeller shaft running at half speed of engine. as the negative impulses try to reverse its turning direction. As this is prevented by the outer clutch, the sleeve is stationary during the negative impulses, and these are therefore of shorter duration than the positive ones, during which the 13 | ||