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 chassis components between a Humber S.S. and a B.V. A1. engine model.
| Identifier | ExFiles\Box 132\2\ scan0062 | |
| Date | 3rd August 1939 guessed | |
| -2- Item NO. GROUP. Humber S.S. lbs. B.V. A1. engine lbs. Difference lbs. Humber saving. B.V. Saving. 3080 3915 15. Frame & Fittings, step irons wing stays, engine mountings & rubbers. 227 368 141 16. (6 lbs) Fuel system (including pump on B.V.) 25.1 43.1 18 17. Exhaust system. 33.8 58.8 25 18. Chassis electrical & Instruments (less electrical units on engine) 114.2 138.3 24 19. Wheels & Tyres (4 only) B.V. 6.5 x 16 Humber 6.0 x 16. 214.5 238. 23.5 20. One shot lub. system. 18.7 18.7 21. Radiator with shell bkts. tierods etc. 71.6 75 3.4 22. Bonnet. 47 1/13 57 1/5 10 23. Bumpers, bkts. jack rests. 50.7 51.5 .8 24. Pressed steel dash. (part of Humber body) 16.5 16.5 25. Centre floor board, apron, sundry bkts. 37.5 37.5 26. Damper control. 6.5 6.5 27. Spare wheel & tyre. 53 1/2 59.5 6 28. Tools, starting handle jack. 23.1 22.6 .5 Sum of above, chassis dry 2272 2566 29. Chassis items unaccounted for on B.V. chassis weighed dry. 124 3/12 124 (handwritten below: 2690) 30. petrol, oil, water approx. 130 154 | ||