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).
The performance characteristics and tendencies of governor-controlled throttle systems.
| Identifier | WestWitteringFiles\M\2Jan1925-March1925\ Scan16 | |
| Date | 1st January 1925 guessed | |
| -6- with the 40/50 full throttle would be available. The car speed will therefore fall off when the slightest gradient is encountered due to the governor controlled range being limited to 18°. 40/50 type governor throttle tendencies. (1) Governed throttles are controlled by springs of constant rating, and by governors whose dynamic couple increases as the square of the speed. These two facts mean that the actual increase in the throttle opening for a fall of 100 r.p.m. will vary as the square of the speed i.e., if at 1000 r.p.m. a drop of 100 r.p.m. opens the throttle 10°, a similar drop at 500 r.p.m. will only open the throttle 2½°. We have also shewn that at high speeds the engine is more sensitive to small throttle openings than at low r.p.m. We therefore expect any type of governor controlled engine to give a much more consistent performance in the way of maintaining a given r.p.m. [struck through] for any setting of the hand control at high engine speeds than at low engine speeds. (2) The lower the spring rating and the higher the dynamic couple of the governor, the greater the sensitiveness of the layout. Unfortunately, in order to attain reasonable engine speeds under these conditions, the low rating spring has to be employed with a very large deflection when the hand quadrant is in its most advanced position. We consider, however, that this can be adapted successfully to the EAC. cars, and have instructed a spring on these lines. contd :- | ||