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 controllability and lag of the Phantom throttle governor, comparing different bearing setups and the Silver Ghost model.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan131 | |
| Date | 19th November 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL c.c. to BJ. Nor.✓ c.c. to RG.{Mr Rowledge}✓ E.{Mr Elliott - Chief Engineer} c.c. to DA.{Bernard Day - Chassis Design} WY.✓ ORIGINAL: Hs{Lord Ernest Hives - Chair}/AJL1/LG19.11.26. PHANTOM - THROTTLE GOVERNOR. X8140 X3443 Attached are diagrams illustrating the controlability of the Phantom throttle through the governor. The figures were obtained by running the engine light and recording the engine RPM. corresponding to each notch of the governor control quadrant, the lever being moved up the quadrant and then down again notch by notch. This is a more severe test than a test on the road. The horizontal width of the diagram obtained indicates the lag due to friction in the governor system. Fig.1: represents a typical standard production car, the best having been made of the existing system. Fig.11. represents a throttle fitted with roller bear-ings and also ball bearings fitted to the governor lever shaft. The lag in this case is reduced to an average of one notch. Under road conditions it is not possible to detect any lag, the throttle control being as sensitive and positive as the Silver Ghost. The lag on the Silver Ghost governor is shewn in fig.7. This is slightly better than the Phantom with roller bearings etc. at high speeds, but not quite so good at the lower speeds, i.e., the Phantom governor with roller bearing throttle and ball bear-ing governor shaft is better than the Silver Ghost at the import-ant slow running speeds. Fig.111. shows the increase in lag over fig.11. if a standard governor is used, as against ball bearings contd :- | ||