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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 and wear characteristics of jointed brake shoes.

Identifier  ExFiles\Box 30\6\  Scan182
Date  15th February 1924
  
R.R. 403A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary}

EXPERIMENTAL REPORT.

Expl. No.

REF: Hm{Capt. W. Hallam - Head Repairs}/Bm/L.G.15.2.24.

JOINTED SHOES.

We have carried out a number of tests of the jointed shoes on our brake testing rig.
From the results we have so far obtained, this type of shoe does not show promise of wearing very consistently. When used on the non-wrapping side, by far the great proportion of wear is concentrated at the toe of the small segment, next to the toggle.
The braking obtained is also uneven, there being a perpetual tendency to chatter. The efficiency of the shoe used in this position is much the same as that of the standard non-wrapping shoe, that is to say, it is very inefficient.
When used on the wrapping side the behaviour of a jointed shoe is better, but its wearing propensities are still in a lesser degree unsatisfactory.
We made a quantitative test to determine the extent of the inequality of wear on the wrapping side. After absorbing 21 H.P. hours at a drum speed of 300 R.P.M. (the temperature of the outside of the drum being maintained at 100°C), the average wear on the small segment was .013" while that on the larger portion of the shoe only .0045".

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