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).
Brake layout for the Spectre model, specifically the hydraulic and Girling systems.
| Identifier | ExFiles\Box 92\4\ scan0028 | |
| Date | 22th November 1934 | |
| To E.{Mr Elliott - Chief Engineer} from Da.{Bernard Day - Chassis Design} c. Wer. Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} Hdy.{William Hardy} Brake Layout - SpectreCodename for Phantom III. Referring to Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}11/KW.16.11.34, if the hydraulic operation for front brakes is not entirely approved of, the suggestion we make is that we should retain the bell crank lever now mounted on the yoke piece (or something equivalent to it), and with it operate a Girling type wedge, an arrangement we see can be easily arranged and which gives us perfect brake geometry during steering. This does not essentially simplify the front brake operation on the chassis, but with the modified leverages given by the Girling operation, and by the semi-servo system, we can reduce the multiplication up that the present system requires, and so relieve the bearings of the carrier levers (which are needed to carry the linkage clear of various obstructions) of most of their load, providing at the same time, if thought desirable anti-friction bearings where they are not already provided. We have looked into the application of the pure Girling system to the rear brakes, and there appears to be no difficulty about this. If we could use a single set of shoes for both hand and foot brakes, the arrangement would be still further simplified and the projection of the brake drums into the body could be eliminated on SpectreCodename for Phantom III, as it is on Wraith. We think the centralised chassis lubrication can be applied to the Girling wedge operation without risk of oil filtering on the shoes, probably further increasing its efficiency. Should the floating fulcrum operation of the shoes be decided to be, or subsequently proved to be, a | ||