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).
Experimental increase in crankpin diameter for the 40/50 HP crankshaft and the potential to revert the dies.
| Identifier | ExFiles\Box 14\2\ Scan088 | |
| Date | 31th October 1930 | |
| Hs.{Lord Ernest Hives - Chair} 17010 BY/SS{S. Smith}3/J.31.10.30. 40/50 H.P.Crankshaft, 2.375" dia.Crankpins. When the diameter of the crankpins was increased from 2.125" to 2.375" experimentally, production was anticipated to the extent of permanently altering the dies. If you have definitely turned down the larger diameter, will you please let us know so that when the dies are resunk we can return to the original forging diameter and avoid the present excessive machining. RECEIVED 31 OCT 1930 HS{Lord Ernest Hives - Chair} BY/SS.{S. Smith} | ||