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 vehicle components of Humber S.S. and B.V. Al. engine models.
| Identifier | ExFiles\Box 126\2\ scan0180 | |
| Date | 3rd August 1939 guessed | |
| Item No. GROUP Humber S.S. lbs. B.V. Al. engine lbs. Difference lbs. Humber Saving. B.V. Saving. 1. Engine withflywheel, clutch, c. casing pedal & mech. starter, dyno. manifolds, carb. 701.4 592. 119 2. Gearbox & lever without servo parts. 93.6 81.7 12 3. Rear Axle (Floating) with brake shoes back plates, and operating mech. which is carried on axle. without drums. 196. 183.5 12.5 4. Rear brake drums (Both 1/C. 24 40.5 16.5 5. Rear springs shackles, clips, buffers 100.4 93.2 7.2 6. Rear dampers, bkts. + roll bar on Humber 23 29.3 6.3 7. Prop. shaft (B.V. Duplex including bearing. 17.9 27.2 9.3 8. Steering Col. controls etc. but no rods and levers. 30 38.5 8.5 9. Steering rods and levers, including pivots. 28.8 32 3.2 10. Front suspension with dampers and fittings without springs or pivots. 61.5 86 24.5 11. Front springs with buffers, clips etc. 57 34 23 12. Front brakes, hubs, back-plate shoes (without drums) and respective op. mech carried on back plate. 42.2 47.9 5.7 13. Front drums 1/C. 24 40 16 14. Brake op. mech) (B.V. including with pedal and) (servo & rods hand lever ) (except those on rear axle, Humber (with master cylinder (but pipe line is on (frame. 10.5 50.2 39.7 | ||