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).
Modifications to a 20/25 crankshaft using existing forgings.
| Identifier | ExFiles\Box 103\3\ scan0096 | |
| Date | 9th September 1931 | |
| BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} HS.{Lord Ernest Hives - Chair} X5010 E1/M9.9.31. 20/25 MODIFIED CRANKSHAFT USING EXISTING FORGINGS. We send you herewith LeC. 2948. shewing the above. You will notice we are asking for 2.25 dia. journals assuming that this is possible with the existing crankcase material, and 2" dia. pins, which latter require new con. rods. We have made the finished width of the web 3.450 instead of 3.250 and the allowance for machining runs very fine round the journal end of the web, but we hope there may be a little to spare above forging drawing sizes to accommodate this. E.{Mr Elliott - Chief Engineer} | ||