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).
The weight of a 40/50 engine from the Test Department.
| Identifier | ExFiles\Box 3\2\ 02-page098 | |
| Date | 19th December 1922 | |
| K700 Mr. Hives from CWH. 19.12.22. Weight of 40/50 engine from Test Dept. complete with exhaust manifold - no water or oil :- 792 lbs. | ||