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 | WestWitteringFiles\R\2October1927-November-1927\ 66 | |
| Date | 1st 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. ---|---|--- Rear springs | 192 lbs. | Rear springs | 170 lbs. Side members. | 176 " | 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. | ||