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).
Test report comparing the performance of various propeller shaft dampers on a vehicle.
| Identifier | ExFiles\Box 90\1\ Scan188 | |
| Date | 7th September 1937 | |
| File 263 To Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} 7.9.37. Propeller shaft damper Tests. We have tried two Studebaker type prop. shaft dampers on B-23-AE. (1) Fitted with springs controlling the load on the friction discs, and rubbers to restrict the movement to the amount they compress. (2) With the friction disc and springs removed, leaving only the rubbers to take the load. The car was first tried without a damper. The only bad period was the usual one from 40.35 on retard. With No.1 damper fitted at 3lbs.17 1/2 radius the particular period was reduced approximately 75%, but another was set up from 50.45 M.P.H. which was equally annoying. The damper was re-set twice, 6 and 10lbs. loading, but with no improvement. No.2 damper was then tried, this gave the same results. An R.R. damper set at 24lbs. was fitted for comparison. While both periods were still audible, they were not objectionable, and we would say were reduced 75% approx. W.Brazier - Tester. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} | ||