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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).
Continued memo discussing modifications to a brake damper to prevent thump and clank noises.

Identifier  ExFiles\Box 178\4\  img106
Date  26th May 1932
  
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HS{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}2/MA.26.5.32.Cont'd

We feel sure that there will be serious brake thump complaints and that we should anticipate them by a modification similar to what we have tried out.

The damper itself can be simpler in construction than the present one; no transfer passages are required.

A non return valve at each end will be required, in our experimental damper we used flat bakelite disc valves, spring loaded, but we think a plain ball valve in a vertical position would be better.

The piston should be solid, not as at present, so that the compression each way is the same; we think a gland will be necessary, our model worked fairly well without one but after any length of service leaks will occur and make the dash pot ineffective in that direction.

Less damping is required for dealing with 'clanks' than for thumps, the dash pot should be arranged therefore so that the gland end (where leaks are likely to occur) is used for damping when the brakes are released.


HS{Lord Ernest Hives - Chair}/A.J.Lidsey.
  
  


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