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).
Circumferential looseness of brake liners, temperature testing, and a proposed experiment with a diagram.
| Identifier | ExFiles\Box 121\1\ scan0350 | |
| Date | 31th October 1940 guessed | |
| 12) Circumferential looseness does not seem to be a worry - so long as the liner cannot come out sideways. I have known a drum with a quite loose liner work quite satisfactorily for many miles, until it came out sideways. 13) On cars, we made drums so that on the "red gate" or other test run max. temp was 100°C. I think this is rather important. If you exceed it, watch out for trouble. We tested them on the rig up to 200°C. 14) There is every reason to suppose that when the brakes are in use the liner runs hotter than the aluminium, due to temperature grade. Rapidly equalizes on releasing brakes. That's about all I can think of at present. The following are experiments I would like to try, circumstances permitting. Take an iron liner about .130" thick (size before finishing) & cast round it an annular rig of RR53C .600" thick. Give it an "ageing" treatment after casting. Then put it in a furnace, hang a weight on the liner & see at what temp. it falls out. Make several. There might be a few half finished liners about the place. [Diagram annotations] ALUM LINER WEIGHTS SUPPORT | ||