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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).
The performance of 5% lead bronze rear foot brake liners, detailing issues with noise and power at different speeds.

Identifier  ExFiles\Box 26\4\  Scan010
Date  2nd July 1914
  
From Exp. Dept.
Copies for:
J.{Mr Johnson W.M.}
By.{R.W. Bailey - Chief Engineer}
No.

Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}12/L2714.
July 2nd. 1914.

REPORT ON REAR FOOT BRAKES.

The 5% lead bronze liners fitted to 58NA{Mr Nadin} do not seem to have given entire satisfaction. Warwick says they squeaked badly when used on the Austrian passes, also they were not as efficient when cold as they were when hot. I understand this car is returning to England soon and we shall be able to investigate the matter.

The 5% lead bronze liners on our 2100K car are working well except for a slight squeak occasionally at low speeds. Also they are not quite as powerful as the cast iron shoes at high speeds but are decidedly quieter in operation. The 5% lead bronze liners on 2300 car which are working on drums lined with cast iron rings are very silent and smooth in operation but are not as powerful as the cast iron liners, chiefly at high speeds. The difficulty with this job is to get a quiet brake which is powerful at all speeds. We can easily get a quiet brake which is not very powerful at high speed or we can get a brake which is powerful at all speeds but is noisy. Personally I prefer the former

[Handwritten on left margin]: X719
  
  


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