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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).
Comparative weight analysis of chassis components between a Humber vehicle and a B.V. (Bentley Victory) vehicle.

Identifier  ExFiles\Box 132\2\  scan0059
Date  3rd August 1939
  
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(6) The Humber rear dampers (including a roll rod not on B.V.) are 5.3 lbs. lighter, but this type have generally not an enviable reputation for standing up to hard work.

(7) The Humber Prop. shaft assembly is 9 lbs. lighter, but the comparison is not a good one because the B.V. has a duplex shaft with extra bearing and housing.

(8) The B.V. steering column is 8.5 lbs. heavier but is a more robust job and has extra controls on it.

(9) Steering rods and levers, B.V. 3.2 lbs. heavier but the layout incorporates an extra rod and lever.

(10) & (11) Springs and front suspension parts taken together are practically identical in weight, the saving on the B.V. springs being compensated by the extra triangle lever which relieves the springs from brake torque and road wheel location.

It is possible that the B.V. suspension may add appreciably to the weight of the frame (See item 15).

(12) & (13) The Humber front brake assembly (Lockheed) less drums, is only 5 - 7 lbs. lighter than the B.V. with corresponding operating parts, but the two drums, (as at rear) are 16 lbs. lighter.

(14) Brake operating mechanism (excluding parts belonging to the axle assemblies)

The Humber is nearly 40 lbs. lighter, but it is difficult to compare a non-servo hydraulic system with a mechanical servo system.

The weight of the Lockheed pipe line is included in the frame section, and is not known.

It may be argued that the advantages of the R.R. servo system is well worth between 30 and 40 lbs. extra.

(15) Frame and Fittings.

Humber 227 lbs. B.V. 368 lbs. difference 141 lbs. This is the most outstanding difference between the two chassis, and a more detailed analysis will be made later.

In both cases step irons are included although some B.V. cars have no running boards, also the B.V. engine mounting brackets and members are more elaborate and provide a high front suspension.
  
  


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