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).
Lightened crankshaft design for the Spectre engine, detailing modifications and weight savings.
| Identifier | ExFiles\Box 93\5\ scan0096 | |
| Date | 11th September 1934 | |
| X6694 317 To-EH. from E/JNR.{Charles L. Jenner} -------------------- c.c. RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} -------------- E/JNR.{Charles L. Jenner}10/HP.11.9.34. ---------------------- re SpectreCodename for Phantom III Crankshaft. -------------------- We send you herewith:- LeC.4032 showing a very much lightened crankshaft which we should like to try on No.2. engine. We have bored out the journals and the crank pins as much as we dare, and this has enabled us to reduce the size of the balance weights, the total amount of saving on the complete crankshaft being 9.1 lbs. We would call attention to the larger size ball bearing which is fitted into the flywheel end for the clutch mounting. The drawing shows parallel reamed bolts for the weights, as requested by RHC.{R. H. Coverley - Production Engineer} E/JNR.{Charles L. Jenner} | ||