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).
Axle weights, comparing an open propeller shaft with cantilever construction and detailing weight savings.
| Identifier | ExFiles\Box 12\2\ 02-page018 | |
| Date | 27th November 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. toE. DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} OY. Y7850 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG2.11.27. EAC.7. AXLE WEIGHTS. +8840 As will be seen from the attached figures, the open propeller shaft with semi elliptic rear springs is definitely heavier than our present cantilever construction. The discrepancy will be still more marked when the lightened torque tube is available for the 40/50 HP. With reference to the rest of EAC.7. axle which is not affected by the type of propeller shaft, a saving of over 50 lbs. has been effected. The figure of 50 lbs. as the wt. saved on the camshafts, carrier plate etc. is rather misleading as on the 40/50 the spring anchorage is included in this, on EAC.7 it is not. Actually, however, 35 lbs. is saved on these items. The brake drums and axle tubes both contribute an appreciable amount to the total weight that has been eliminated. Hs{Lord Ernest Hives - Chair}/W. A.{Mr Adams} Robotham. | ||