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).
Deciding to use air-hardened steel for Goshawk back axle driving shafts in the future.
| Identifier | ExFiles\Box 49\2\ Scan094 | |
| Date | 21th June 1922 | |
| X.4256. To Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} from R.{Sir Henry Royce} c. to UJ. R2/M21.6.22. RE. GOSHAWK BACK AXLE. X.4256. Regarding driving shafts it is understood that air hardened steel has proved to be the more satisfactory for these than anything else. Seeing that to make these in this material is not prohibitively expensive I agree that this shall be the material used in future. R.{Sir Henry Royce} | ||