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).
Ph.III hand brake, considering different materials (Ferodo vs Fibre H.D.) and leverage for improved performance.
| Identifier | ExFiles\Box 92\4\ scan0170 | |
| Date | 17th March 1936 | |
| X306 To E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Hdy.{William Hardy} c. to By.{R.W. Bailey - Chief Engineer} HS{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}8/JH.17.3.36. Ph.III Hand Brake. In reply to E.S/HP.11.3.36. We agree that a high µ Ferodo is desirable on Ph.III handbrakes with a 60-1 ratio and 8° travel. We have ordered some Fibre H.D. material, which has a µ of .7 for trial purposes. We have been warned that this material is unsuitable for high temperature operation. We think it may prove satisfactory on the hand brake shoes, but we cannot recommend it without a thorough test. We think that it would be best to go into production of the first 50 cars with F.B.A. linings, and to run a 10,000 miles test using Fibre H.D. so that we can fit it to complaint cases. We should like to know if it is possible on Ph.III to fit a hand brake lever with higher leverage and longer stroke; and when next 33-KX is available we will find out for you where the lost movement occurs on this car. HS{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale} | ||