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).
Design for a modified 20/25 HP crankshaft created from existing forgings.
| Identifier | ExFiles\Box 103\3\ scan0131 | |
| Date | 21th November 1931 | |
| SCHEME 1557 20/25 HP MODIFIED CRANKSHAFT FROM EXISTING FORGINGS USING FORGING E56885 SCALE 1/1 DRAWING OFFICE TRACED 21 NOV 31 | ||