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 of axle weights between the EAC.7 and 40/50 HP models, detailing alterations due to the Hotchkiss drive.
| Identifier | ExFiles\Box 71\2\ scan0191 | |
| Date | 2nd November 1927 guessed | |
| COMPARISON EAC. 7. AND 40/50 HP. AXLE WEIGHTS. Weight alterations due to Hotchkiss drive. EAC.7. LBS. | 40/50 HP. LBS. 2 universal joints. 48.0 | Sphere and housing. 21.9 Central axle housing. 39.0 | Torque tube. 34.7 Propeller shaft. 12.25 | Central axle housing. 46.7 Pinion housing and thrust races. 12.3 | Pinion and prop.shaft. 27.6 Pinion. 5.68 | Thrust.races. 13.9 TOTAL 117.23 | TOTAL 144.8 Total saving in wt. EAC.7. axle over 40/50 HP. 27.7 lbs. Wt. increased on other items :- EAC.7. | 40/50 HP. Rear springs. 192 lbs. | Rear springs. 170 lbs. Side members. 178 " | Side members. 156 " EAC. rear springs 22 lbs. heavier than 40/50. " side members 20 lbs. " " " Therefore actually the EAC.7. method of torque control is 14 lbs. heavier than that of the Phantom at present; when the lightened torque tube is produced this discrepancy will be still further increased. contd :- | ||