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).
Crankshaft materials (Hykro vs VCM) and processes, referencing a specific Bentley chassis and a Phantom III.
| Identifier | ExFiles\Box 90\4\ scan0117 | |
| Date | 29th September 1937 | |
| SS{S. Smith} 261 Rm.{William Robotham - Chief Engineer} Swot BY.3/N.29.9.37. Re: Bentley Chassis. ------------------- What running have we done on Hycro cranks? Rm{William Robotham - Chief Engineer} Referring ton Hd{Mr Hayward/Mr Huddy}/SB.{Mr Bull/Mr Bannister}1/HR.22.9.37, in connection with Raymond Mays car B-24-GA, there are two points which need attention: (1) Do we gain enough out of the "taking up" process to avoid fitting AC.2, material. (2) We certainly ought to be using Hykro for all our crankshafts instead of VCM. The hardness of a Hykro shaft is 800-900 " " " " VCM. " 600-650 I asked for a Hykro Phantom III crank to be tested about two years ago, was this ever fitted to an engine? BY.{R.W. Bailey - Chief Engineer} | ||