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).
Brake performance, comparing 'ferodo' linings with cast iron, and proposing improvements for overheating issues.
Identifier | ExFiles\Box 26\4\ Scan019 | |
Date | 21th July 1914 | |
R.R. 25M (150 H) W.W. 829. 2-7-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0670. To By.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} 2. Brakes. R10/P 21. 7. 14. out of action through the heat expanding the outer drum. If, however, the old brake, and also the cast iron liners will not stand this treatment, one would think that these ferodo liners were splendid, as they would pull up the car with remarkable smoothness, and silence and they appear perfect for intermittent work, but seem to be a failure for a long down hill. What a long down hill means is very difficult to estimate as we have no very long descents in England sufficiently rapid to make a test, and it is only by comparison with the other brakes, which may be said to be generally satisfactory, that we can tell exactly where we are. I should say that the ferodo lining would suit the London traffic exceedingly well where the work is intermittent and the brakes not liable to get over-heated, and I should suggest that a good many cars should be fitted up. We must, however, push forward the other models for comparison, which run, as follows:- [STAMP: BROMLEY] At once - we can try the combination of ferodo and cast iron shoes. As quickly as possible- get some suitable forgings for the wider drums with cooling ribs. I may add with reference to ferodo lining that the expansion appears to be quite even, and there is no rubbing after the application of the brake, and apparently the drums are quite true. The increase of relative motion by decrease of leverage, and the increased cooling surface is the only hope of making these ST | ||