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).
Weight comparison table for 4 1/2 litre engine parts made from Electron versus Aluminium.
| Identifier | ExFiles\Box 88\3\ scan0170 | |
| Date | 7th August 1935 guessed | |
| wt file . x258 53 4 1/2 LITRE WEIGHT IN LBS. PART. ELECTRON ALUMINIUM Crankcase (with top main bearings + bolts) 47 73 Sump (complete) 41 60 Camcase 7 1/2 13 1/2 Vertical Shaft Housing 6 9 101 1/2 155 1/2 | ||