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 analysis for the Bentley III, detailing the weight differences between models 7.B.5 and 8.B.5.
| Identifier | ExFiles\Box 100\3\ scan0056 | |
| Date | 30th August 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/FD{Frank Dodd - Bodies}9/R.30.8.38. BENTLEY III WEIGHT COMPARISON. We give below a weight analysis of 7.B.5 and 8.B.5. showing where the difference in body and chassis weight is accounted for:- 7.B.5. 8.B.5. cwts.qrs.lbs. cwts.qrs.lbs. Complete Car ........ 33 3 7 35 2 15 The difference in the two cars is therefore c. q. lbs. 1 3 8 or 204 lbs. This extra weight is divided up between the body and chassis, 8.B.5 body being 135 lbs heavier than 7.B.5, and 8.B.5 chassis being 69 lbs heavier than 7.B.5 making a total of 204 lbs. The extra chassis weight is accounted for as follows:- Rear Axle extra weight .... 35 lbs (WITH CAST IRON DRUMS) 12 lbs a pair heavier than aluminium.) Brake Equalizer ......... 5¼ " Cast Iron Front Brake Drum 16 Frame ................. 7 Bonnet ................ 13½ Brake damper .......... 2¼ Less ---- 79¼ Less sheet metal dash board on 8.B.5 which is 10 lbs lighter than 7.B.5 ..... 10 ---- Total extra = 69¼ The extra body weight is shown in comparison with 7.B.5. we also include the S.S. and standard 4¼-litre Bentley Shell weight for comparison. | ||