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).
Comparison table of axle weights for EAC.7 and KAE 40/50 models.
| Identifier | ExFiles\Box 12\2\ 02-page021 | |
| Date | 1st November 1927 guessed | |
| EAC. 7. AND 40/50 AXLE WEIGHTS. Parts included in weights given. ITEM. | (a) EAC.7. | (b) KAE 40/50. Axle tubes stripped. | 54.1 | 59.88 Brake drums. | 52.0 | 61.0 Brake shoes and brake shoe mounting, carrier plates, camshaft and camshaft mounting (in the case of the 40/50 this includes rear spring roller bracket). | 59.10 | 108.5 Prop. shaft complete (a) No pinion. (b) Pinion. | 12.25 | 27.63 2 universal joints (a). 40/50 sphere and casing (b). | 48.0 | 21.9 Pinion (a). Torque kax. tube (b). | 5.68 | 20.88 Springs 175 lbs/1" rating. | 192 | 174.5 Crown wheel and differential assembly (no axle shafts or outer case included). | 47 | 49.75 Central axle housing. | 39.1 | 46.7 Driving shafts. | 30 | 29.75 Thrust race housing and thrust races for the pinion. | 12.3 | 13.9 Total wt. of all the axle bits in rear of gearbox (sphere and case included in 40/50 HP.) | 487.3 | 563.6 Wt. of frame side members. | 176 | 156 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||