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).
Issues with floating fulcrum brakes and tests to reduce jaggering.
| Identifier | WestWitteringFiles\K\December1923\ Scan45 | |
| Date | 5th December 1923 | |
| R.R. 492A (40 H) (SL 42 12-7-23). J.H.D. EXPERIMENTAL REPORT. Expl. No. 9940 REF: Hs{Lord Ernest Hives - Chair}2/T5.12.23. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. CJ. RG.{Mr Rowledge} c. EY. Da.{Bernard Day - Chassis Design} RE BRAKES. 9940 X4214 On the floating Fulcrum brake, even when we have had the full length of Ferodo, we have never been able to get this brake effective, except when the leverage has been increased to such an extent that we have had practically no clearance. So far we do not appear to have obtained any wrapping effect with the floating fulcrum. We have tried the same methods of bedding which make the ordinary brakes very effective. As we cannot see any reason for this, we propose testing these brakes on our dynamometer test. We have recently taken a standard front wheel brake which was jaggering and reduced the Ferodo from the toggle end on the wrapping shoe only in 1/4" stages. We found after we had removed 2 1/2" we could still obtain jaggers. With 3" removed, we had very slight occasional jaggers. With 3 1/2" removed, there were no jaggers and very little braking. We had reduced the braking at least 50%. We are proceeding to test shoes on the floating fulcrum brakes, in which the shoes are sawn apart and linked together. Contd. | ||