Tests conducted on the EAC.V11 braking system to improve rigidity and address rear axle instability during rapid stops.
| Identifier | ExFiles\Box 12\5\ 05-page032 | |
| Date | 7th March 1927 | |
| To R. {Sir Henry Royce} from Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} c. to BJ. Wor. {Arthur Wormald - General Works Manager} c. to RQ. E. {Mr Elliott - Chief Engineer} c. to DA. {Bernard Day - Chassis Design} BY. {R.W. Bailey - Chief Engineer} Handwritten: X7420 Upside down text bleed-through: CERTIFICATES OF INSPECTION Upside down text bleed-through: ROLLS-ROYCE ENGINES AND SPARES. Hs {Lord Ernest Hives - Chair} /Rml/LG7.3.27. EAC.V11 - BRAKING. Handwritten: 1235 We have carried out tests with rear brake drums stiffened up to give them the same effective rigidity as the present rear drums on EAC.Vlll. The result is a definite reduction in sponginess of the brake pedal under violent application. However the system is not yet as rigid as that on the present Phantom. This is undoubtedly partially due to the rear spring twist of the brake torque. As the direct rear braking is already the minimum, further improvement would appear to be limited to stiffening up the rear direct brake linkage if it is feasible. As at present arranged, the rear axle has a decided tendency to dance about the road when making a rapid stop; we are fitting Hartfords as well as hydraulics to the rear to note the effect of increased damping on this feature. Hs {Lord Ernest Hives - Chair} /Rn. {Mr Robinson} | ||
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).