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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).
Weight comparison of axle components between the EAC.7 and 40/50 HP models, detailing alterations due to the Hotchkiss drive.

Identifier  ExFiles\Box 12\2\  02-page019
Date  27th 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. | 43.0 | 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
| 117.23 | | 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. | 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.

contd :-
  
  


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