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).
Results of spring tests to determine the critical speed on Spectre.
| Identifier | ExFiles\Box 96\2\ scan0011 | |
| Date | 12th September 1934 | |
| x354 To E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Smth.ll/KW.12.9.34. Critical Speed on SpectreCodename for Phantom III. We have tried two sets of springs with the following results :- | | Seat Load | Rate | Crit. Speed | | E.{Mr Elliott - Chief Engineer} 85315 | 42 | 183 | 3000 | | E.{Mr Elliott - Chief Engineer} 85316 | 52 | 183 | 3800-4000 | We have in hand a third set (seat load 44, rate 216) which ought to give a higher speed than either of the above. At the moment Swindall does not put much trust in his figures owing to the fact that the power falls off rapidly at high speeds in any case, due to bearing tightness. The results are also unreliable owing to the tendency for the eccentrics to stick. Hs{Lord Ernest Hives - Chair}/F.Ll.Smith. | ||