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).
Query regarding the nitriding of Bentley 4.2 litre crankshafts and the first use of Hykro steel.
| Identifier | ExFiles\Box 146\5\ scan0351 | |
| Date | 6th May 1940 | |
| 12/5 To "Rm{William Robotham - Chief Engineer}" Derby Levallois Sr/VA9/MLG.6.5.40 Re- Nitriding of Bentley 4.2 litre crankshafts after regrinding of main journals With reference to Rm.{William Robotham - Chief Engineer}9/R.6.12.37, we shall be glad if you will kindly let us know on which series and on which chassis Hykro steel was first used for crankshafts. We presume that this type of steel was used up to the outbreak of the war for the production of crankshafts on Bentley chassis. "VA" A | ||