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).
Propeller shaft damper's torque requirements to address gearbox and axle rattles.
| Identifier | ExFiles\Box 89\5\ scan0049 | |
| Date | 9th June 1939 | |
| 261 To Hd{Mr Hayward/Mr Huddy}/Sd. from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}3/MH.{M. Huckerby}9.6.39. Re B.38.HK.{Col. T. Harker - Sales} C.F.BENNION, ESQ. Referring to your memo on the above subject, the number of springs in the propellor shaft is not what mattered, but the torque required to slip the flywheels. The primary object of the propellor shaft damper was to overcome over-run rattles in the gearbox and axle at speeds between 50 and 37 miles an hour. Any friction setting above 32 lbs.ins. until almost solid would satisfy this requirement. We were not ourselves aware that for an improvement in clutch jaggers it was necessary to have a very low load. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||