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).
Proposal to create a 3 litre 6 cylinder engine using parts from other engines as an insurance policy.
| Identifier | ExFiles\Box 132\1\ scan0157 | |
| Date | 30th December 1939 | |
| 116 & 1044. 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} | ||