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 report on vehicle performance issues including steering, engine roughness, and carburetter adjustments for the SS (Phantom 2).
| Identifier | ExFiles\Box 13\3\ 03-page099 | |
| Date | 28th June 1929 | |
| X7080 Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} SECRET. R2/M28.6.29. c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} OY. c. to Mr. Fuller By.{R.W. Bailey - Chief Engineer} FN. EP.{G. Eric Platford - Chief Quality Engineer} L. DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} SS.{S. Smith} (OR NEW NAME SUCH AS PHANTOM 2. X7770 X928 X7080 The impression of variation in steering is probably due to tyres, and especially to tyre pressure, but is also largely influenced by exact angle of pivot lean (side elevation). The engine pick-up roughness varies with the ignition timing. Sometimes I find the magneto earlier than the battery. This should only be compared at three quarters or more fully advanced, because when retarded the magneto is naturally earlier. Enormous variation apparently in chassis virtues are certain to be due to body peculiarities. Older chassis certainly appear far smoother and sweeter than the new ones. We believe that the intake (carburetter) silencer we are sending to Derby this week will have marked improvement on the fuss and road complained of. I know there should be slightly more noise from the vigorous induction, but SS.{S. Smith} seems greatly so, which we are investigating. The carburetter adjustment accounts for much variation in perfection and imperfection in running. I almost always find high speed jets relatively weak. I believe that OY's poor impressions are often due to this cause. Increasing the high speed jet to fully strong might enable us to use more extra air, or a larger high speed throat, and hence obtain more power and less noise. R.{Sir Henry Royce} | ||