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).
Secret memo discussing the design and testing of a throttle governor control.
| Identifier | ExFiles\Box 66a\3\ scan0050 | |
| Date | 26th March 1925 | |
| X. 8140 To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} c. to CJ. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} S E C R E T. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. E1/M26.3.25. THROTTLE GOVERNOR CONTROL. X. 8140 In reply to your letter concerning the above would you kindly note that the governor shaft arm commences to open the throttle valve with a ratio of 5 to 1 in the design as you saw it, and the rate of angular opening at the beginning of the stroke is just over 10% of the rate of angular opening at the end of the stroke. We have a modified design of this control nearly ready with .750 instead of .5 diameter roller and the rate of angular opening at the beginning 25% of that of the end. We tested the friction of the throttle with the engine running slowly under no load when in Derby, and the amount of torque required to overcome it obtained by pulling with a spring balance on the throttle lever 1" long, was 1 lb.inch. This agrees fairly well with the amount obtained by calculation. E.{Mr Elliott - Chief Engineer} | ||