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).
Material for Goshawk 11 rear brake drums, detailing issues with soft mild steel and proposing a new steel with higher carbon content.
| Identifier | ExFiles\Box 5\3\ 03-page043 | |
| Date | 16th September 1931 | |
| X4257 Wd.{Mr Wood/Mr Whitehead} from BY.{R.W. Bailey - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} X2457 (Strikethrough) X3409 (Strikethrough) GOSHAWK 11. REAR HUB & BRAKE. RE MATERIAL FOR BRAKE DRUMS. The mild steel brake drums which we have received are too soft, the carbon being too low. This is not the O.O. fault, as I particularly wanted to try low carbon drums as an experiment to overcome glazing, but the carbon is so low in this case that the drum tears up, and it cannot be hardened. We tried feroasbestos, which I have instructed my department to order three sets of, and the use of aluminium rivets with same to see whether this will overcome the cutting in on the present drum, but the point I have in writing at the moment is, I would like to know whether you can obtain pressed steel drums with a carbon content of .26 to .33 approximately, as a material of this amount of carbon will harden and enable me to try various brinell figures in connection with same. This would be, generally speaking, of the quality Thomsons propose for their frame pressings. BY.{R.W. Bailey - Chief Engineer} [Stamped Text] RECEIVED SEP 16 1931 BY6-P16.9.31. | ||