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).
Letter to a client in France regarding technical issues with Phantom III brakes, specifically bearing wear and pedal pressure.
| Identifier | ExFiles\Box 91\3\ scan0196 | |
| Date | 14th November 1935 | |
| x300a G.W. Hancock, Esq., Hotel de France, Chateauroux, Indre, France. HS{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}21/KW.14.11.35. Phantom III Brakes. We note your scheme for preventing the entry of water and mud into the needle roller bearings on the bell cranks. We are going to instruct a similar scheme for fitting to one of our cars. We notice that you have had to shorten the needles. This will increase the bearing pressure on the already indented spindle, so in case you should be again held up for this or any other reason, we are sending out in about 3 days' time an oilite bearing assembly which we hope you will be able to fit should need arise. The spindle on your car has a very low Brinell figure; so we are instructing others of a harder material. We are interested in your implication that brake pedal pressures of 90 lbs., or less, are dangerous on your car in France. This is contrary to our experience over here. We have not measured any drum distortions using a greater toggle load than 500 lbs., which corresponds approximately to a pedal load of 40 lbs. or less. When we are measuring these distortions we find it convenient not to use the servo as this would introduce the complication of servo fade: so a much increased pedal pressure is necessary to have the same effect on the drums. We trust you have not overlooked this point. HS{Lord Ernest Hives - Chair}/A.F.Martindale. | ||