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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).
Instructions for modifying three pairs of springs and observations on their stiffness, camber and hardness.

Identifier  ExFiles\Box 43\2\  Scan239
Date  28th December 1927
  
- 2 -

BY2/G.28.12.27.

In addition, as pointed out, the stiffness of the spring was altogether wrong, and the initial camber was not to drawing.

In view therefore of the fact that these differences made the springs unusable, I instructed Messrs. Firths to treat the springs in the following manner :-

A/- Supply one pair of springs accurately to the detail drawing submitted with the exception that the top plate was to be made to conform to the curve shown on the top plate of the sample American spring.

B/- A second pair of springs were to be modified so as to conform exactly to tne American sample spring.

C/- The third pair I agreed Messrs. Firths should modify slightly from either of the foregoing pairs in accordance with Mr. Stansfield's proposals, these proposals being in the direction of maintaining a constant stress in all the plates, and would be based absolutely on the American theory in general, but for certain small particulars was to depart where Mr.Stansfield thought he could keep the stress a little more constant.

Finally, it was interesting to note that the American spring showed a very wide variation on the brinell figures as taken on the various plates. Apparently each plate had been brinelled in America, but this did not prevent them producing a spring in which the brinell figures of the plates varied approximately between 370 and 440, whilst on one plate the brinell figure was as low as 350, a plate which we should have considered altogether too soft to be incorporated.

BY.{R.W. Bailey - Chief Engineer} BY
  
  


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