Secret memo discussing an experiment on four-wheel brakes by removing the non-wrapping shoe.
| Identifier | ExFiles\Box 73\2\ scan0226 | |
| Date | 29th January 1924 | |
| X. 9940 To Hs. {Lord Ernest Hives - Chair} from DA. {Bernard Day - Chassis Design} S E C R E T. DA {Bernard Day - Chassis Design} 2/M29.1.24. E. {Mr Elliott - Chief Engineer} A. {Mr Adams} C. FOUR WHEEL BRAKES. X. 9940 We telegraphed to you this morning suggesting trying removing the non-wrapping shoe from the rear axle so as to get the benefit of the wrapping shoe only, which we understand from your figures raises the apparent co- efficient of friction from .43 and .84 and should thus give us a further drop of half in the work done by the servo. We suggest this as a test, to see what the effect is, and if people were agreed that it was an advantage we could design some all-wrapping shoes either on Perrot's linesor on our own lines, suitable for the back brakes. Since we had this idea we believe Mr. Royce has wired you practically agreeing to a slow speed servo, in which case the urgency of this experiment is less. DA. {Bernard Day - Chassis Design} | ||
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).