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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 analysis and specifications of the Wraith model compared to other vehicles.

Identifier  ExFiles\Box 10\5\  05-page025
Date  6th February 1937
  
GRY{Shadwell Grylls} 658.

SECRET.

Sg.{Arthur F. Sidgreaves - MD}
C-Hs{Lord Ernest Hives - Chair}-Rm.{William Robotham - Chief Engineer}
E.3/HP.6.2.37.

Wraith Weight.

Replying to your memo Sg.{Arthur F. Sidgreaves - MD}9/E.1.2.37, we note your remarks of the comparison between the Rolls-Royce and Packard.

With regard to the Wraith weight, our figures show that the chassis is only 14 lbs lighter at the moment than the 25/30, but this is in spite of various additions such as stiffer frame, second speed synchro-mesh, rear roll rod, oil cleaner, and hydraulic jacks.

The final rear axle will be lighter than the one on the car at present, and the same applies to the radiator. We will do all we can to save weight where possible.

The final engine unit we do not think is likely to be lighter than the present one.

As regards the coachwork, our figures show that the body, wings, running boards, etc, are 2 qrs 4 lbs lighter than the standard Thrupp and Maberley limousine on 22-G-V.{VIENNA} This saving has been achieved in spite of the body being larger by means of using aero glass in the doors, Bentley sections on frames and doors, Bentley locks and window fittings, and lighter floorboards.

The remainder of the weight is made up of extras mostly complete front and rear bumpers with supports, and a car heater.

The nett result is that in spite of a more comprehensive specification, we are just about the same total curb weight as the present 25/30 car, if we assume the Wraith to be fitted with two spare wheels, similar to 22-G-V when it was weighed.

The weight saving on the Continental Phantom has to a large extent been accomplished by using Wraith features. It is, therefore, obvious that there is not the same amount of potential weight saving available for the Wraith. We will however go into this matter very carefully and report on what we think is possible. In the meantime it has been suggested
  
  


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