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 weights of axle components to calculate weight savings between models EAC.7 and 40/50.
| Identifier | ExFiles\Box 12\2\ 02-page020 | |
| Date | 27th November 1927 guessed | |
| WEIGHT SAVING INDEPENDENT OF TYPE OF AXLE CONTROL. ITEM. | EAC. 7. | 40/50. | WT. SAVING. Camshafts and camshaft mounting with brake carrier plates and brake shoes. (EAC.7. spring pads omitted.++) | 59++ | 108.9 | 49.9 Differential and crown wheel assembly. | 47 | 49.75 | 2.75 Brake drums. | 52 | 61 | 9 Axle tubes. | 54 | 59 | 5 Driving shafts. | 30 | 29.75 | .25 Spring carrier bracket not included on EAC.7. with carrier plates. | 14.9++ | | 66.9 | | | 14.9 | | | 52.0 Amount saved previously tabulated. | | | 27.7 | | | 79.9 Total axle wts. of everything behind the gearbox. | 487.3 | 563.6 | 76.0+ ++ This weight on EAC.7. is transferred from the frame to the axle together with 8 lbs. of spring clips. + The discrepancy of 3.7 lbs. we consider may be due to experimental cumulative errors in weighing. contd :- | ||