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).
Suggesting experimental tests to address issues with brake drum polishing and the consequent loss of braking effectiveness.
| Identifier | ExFiles\Box 32\2\ Scan029 | |
| Date | 14th October 1921 | |
| R.R. 63 (500 H) (S.E. 441. 22-1-18.) Bm. 2/212/18. X3458 Hs.{Lord Ernest Hives - Chair} from BY.{R.W. Bailey - Chief Engineer} BY5-P14.10.21. REAR HUB AND BRAKE. X3458 RE POLISHING OF BRAKE SHOES AND DRUMS AND X3409 CONSEQUENT FALLING OFF IN BRAKING EFFECTS. In turning the above matter over in my mind, it occurred to me that you could try out some tests, either on the car or a stationary apparatus, which might be of considerably value to us at the moment. (1) I have instructed Mr Pendlebury to fully anneal a pair of brake drums, so as to soften them to their lowest Brinell figure, in order that you might try such drums either on a car or on a special brake rig. (2) Possibly a reduction in area of the material might considerably affect the results, for instance, if we halved the area of the Ferodo we should double the surface pressure, and possibly this might, with our existing Brinell figures, stop the polishing, as it seems to me obvious that the pressure per sq.inch on the fabric must bear a relation to the Brinell figure on the drum which it is possible to use. only experimental suggestions. BY.{R.W. Bailey - Chief Engineer} By [STAMP: RECEIVED RY 14 OCT 1921] | ||