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 torsiograph tests on engines and the performance of various dampers.
| Identifier | ExFiles\Box 132\1\ scan0127 | |
| Date | 21th April 1939 | |
| 1116 (Rm{William Robotham - Chief Engineer}/JRS 2/TH 22.4.39 also in IOHN). By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} Rm{William Robotham - Chief Engineer}5/R.21.4.39. Attached are the results of torsiograph tests which we have been taking on our engines. It remains to be seen whether the two peaks shown on Fig.1, which are left when the damper is fitted, are noticeable in the car. It is not always possible to say that a damper will be satisfactory from the results obtained from the Summers indicator. As an example, we have not so far got a harmonic damper on the six which is as good as our Lanchester type when run on the road, though from Test Bed graphs we are surprised at this result. Rm.{William Robotham - Chief Engineer} | ||