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).
Clarifying that Hykro crankshafts were used experimentally on Bentley and Phantom III models, but not in production.
| Identifier | ExFiles\Box 132\2\ scan0169 | |
| Date | 22th May 1940 | |
| 1116 Rm.{William Robotham - Chief Engineer} BY/SB.{Mr Bull/Mr Bannister}8/HR.22.5.40. re HYKRO CRANKSHAFTS. With reference to your Rm.{William Robotham - Chief Engineer}3/ML.14.5.40., Hykro crankshafts were never used on Production on the Bentley, but several crankshafts were used experimentally on both Bentley and Phantom III. BY/SBS | ||