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).
Table comparing the weights of a complete car and its body components.
| Identifier | ExFiles\Box 100\3\ scan0084 | |
| Date | 24th August 1939 guessed | |
| -3- Item No. GROUP. Humber S.S. lbs. B.V. Al. engine lbs. Difference lbs. Humber Saving B.V. Saving 31. (Including dash for Humber) Body with wings, seats, boards, acces. 1078 1071* 32. Complete car ready for road. 3480 3915 (These weights agree closely with actual curb weight. = 31.1 35 cwt. * Without dash centre floor board. | ||