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).
Experimental testing of various brake linings, concluding with a recommendation to use Tenoid P for production.
| Identifier | ExFiles\Box 26\4\ Scan369 | |
| Date | 24th August 1928 | |
| X. 719 hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}8/LG24.8.28. To R.{Sir Henry Royce} from hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} BRAKE LININGS. X.4466 We have been trying experimentally all sorts of brake linings for the past three years. They can be divided up into three groups :- (1) Soft linings. We ran some Ferobestos linings. These were very soft, had a fairly high co-efficient of friction, and seemed slightly better than our std. material for brake squeaks. They proved unsatisfactory, because they had insufficient life. (2) Intermediate. Linings comparable for density with our std. Ferodo. We tried various types of Ferodo with low co-efficients of friction; some even impregnated with graphite with a view to overcoming brake squeaks but they were no good. We tried Tenoid grade F.{Mr Friese} but it was bad for squeaking. Finally we have run Tenoid P. which gives us very consistent braking, is better than Ferodo for squeaking, and appears to wear as well as our standard material. (3) Hard linings. Harder grades of Ferodo, Tenoid T., and Raybestos all proved bad for squeaking. In addition Raybestos scored the drums very badly. As a result of our tests we recommend that a small quantity of Tenoid P. lining is tried out on production, as so far it has definitely shewn more desirable characteristics all round than our std. material. Incidentally there is supposed to be a reduction in cost with Tenoid over Ferodo. HS{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} | ||