Proposing a 3 litre 6 cylinder engine as a replacement, discussing component usage and crankshaft analysis.
| Identifier | ExFiles\Box 124\1\ scan0292 | |
| Date | 30th December 1939 | |
| 10444 1116 To Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} c. to Rm {William Robotham - Chief Engineer} /JRS. Rm. {William Robotham - Chief Engineer} 9/JH.30.12.39. Crankshaft Torsional Frequency 3 litre 6 cyl. Engine. We are proposing to make a 3 litre 6 cyl. engine as an insurance policy against the four 2.8 litre being unsuitable for a R.R. car. We are using the pin dia., the con. rods and the pistons from the 2 litre four cyl. thumpette. We can work on 60% balance as the max. required with the relatively enormous journals. We have asked Spooner to contact with you with a view to your shewing him how to ascertain the crankshaft critical relative to the existing 4 1/4 litre shaft. Rm. {William Robotham - Chief Engineer} | ||
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).