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).
The performance and potential modifications of Phantom III clutches fitted with Thermoid facing.
| Identifier | ExFiles\Box 96\1\ scan0299 | |
| Date | 23th March 1938 | |
| 361 also 312 Sg.{Arthur F. Sidgreaves - MD} from Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} c. Hs.{Lord Ernest Hives - Chair} c. Hy.{Tom Haldenby - Plant Engineer} c. Da.{Bernard Day - Chassis Design} c. Mx.{John H Maddocks - Chief Proving Officer} c. Ld. c. OWH. P.III CLUTCH WITH THERMOID FACING. The attached report indicates that we can run P.III clutches nearer the slipping point than at present, and, as a result, get a smoother take-up. We have only recently discovered this during tests on the Bentley clutch fitted with Thermoid. We are circulating a Depot Sheet forthwith pointing out that these weaker clutch springs can be used in cases of complaint, and, in the meantime, should like to fit them to trials cars to get a figure of merit for them under ordinary traffic conditions. As soon as we have a reasonable mileage on several cars without trouble we shall circulate a standardisation sheet. Complaints of P.III cars with Thermoid lining are not sufficiently numerous to justify any alteration without adequate testing. Rm.{William Robotham - Chief Engineer} | ||