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).
Brinell hardness specification and manufacturing process for the Goshawk 11 clutch plate.
| Identifier | ExFiles\Box 74\2\ scan0325 | |
| Date | 18th May 1921 | |
| Ms. from EY. C. Ws. C. Mr D'Aeth. C. Hs.{Lord Ernest Hives - Chair} C. Mr Broome. X4244 EY5-P18.5.21. X4244 GOSHAWK 11 - CLUTCH. Referring to Clutch Plate G.50218, I think the Brinell figure which will give sufficient resistance to wear, whilst being easily machineable, would be 255 - 277. At any rate, these are the figures which we should add to our drawing, experimentally. The Experimental Department should note that these figures have been purposely kept low, with the object of easing the machining, and should carefully check this point, namely, wear during experimental running. The proposal now is, that we shall buy the plates in the forged condition, from Messrs. Firths, harden them at our Works as a first operation, and then complete machining by the most convenient methods in the usual way. BY.{R.W. Bailey - Chief Engineer} [STAMP: RECEIVED] | ||