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).
Transmission vibration issues on the 25/30HP chassis and the proposed solution of fitting a propeller shaft damper.
| Identifier | ExFiles\Box 105\2\ scan0152 | |
| Date | 4th August 1936 | |
| x537 [handwritten] Rm{William Robotham - Chief Engineer} [handwritten signature] From MX.{John H Maddocks - Chief Proving Officer} EX/T4.8.36 25/30HP TRANSMISSION We occasionally experience trouble with chassis on test due to transmission vibration which shows up as a "rattle" from the gear box, or a "moaning" noise from the axle when running on retard at about 40 m.p.h. This feature is one that is well-known and was overcome on the 20/25HP chassis by the propellor shaft damper. We feel that we shall have to return to the use of this damper and Rm.{William Robotham - Chief Engineer} is in agreement with this. We have demonstrated to him a rather marked example on a chassis GHI-33 we now have on test. We have further proved that the vibration and its consequent effect on the axle is entirely removed by fitting the propellor shaft damper, which incidentally can be easily fitted on existing chassis, as the provision for same has been retained. Pending further experimental investigation of the matter with a view to reducing the mass of the flywheel damper, we should like permission to fit the propellor shaft damper on chassis which have this feature so marked as the chassis above referred to. We believe there is a small amount of material in existence to enable a few dampers to be made up, in fact we have two in our hands at the moment. EHR [handwritten signature] | ||