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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).
Tests conducted on 'Halo' brake linings, with the segment in the centre of the shoe only.

Identifier  ExFiles\Box 26\4\  Scan195
Date  1st December 1923
  
R.R. 493 (40 H) (SL 12 12-7-23). J.H., D.{John DeLooze - Company Secretary}
Handwritten: X4388
EXPERIMENTAL REPORT.
COPIES TO: R.CJ. BJ. WOR.{Arthur Wormald - General Works Manager} By.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} PN.{Mr Northey} OY.
Expl. No. 4388
REF. HS{Lord Ernest Hives - Chair}/RB{R. Bowen}2/LGT.12.23.
OBJECT OF TEST.
Tests on 'Halo' Brake Linings.
Segment in centre of shoe only.
TESTER.
R.{Sir Henry Royce} Bolton.
CONDITIONS.
Initial r.p.m. of engine 1500
" " " drum 473
Final " " engine 1000
" " " drum 315.
Drum cooled by constant flow of water - no springs fitted to shoes. Every test made with drum cold.
[Drawing of a brake shoe segment with angles 66°, 56°, and 24° indicated]
SUMMARY OF TEST.
| Both shoes. | Wrapping shoe. | Non-wrapping shoe. |
|---|---|---|
| 13 } | 4½ } | 24 } |
| 13 } 12.8 | 4 } 4.5 | 24 } 24.4 |
| 13 } | 4½ } | 24 } |
| 13 } | 4½ } | 26 } |
| 12 } | 5 } | 24 } |
|---|---|---|
| 15 | 9.4 | 31.4 |
Corresponding figs. for similar shoes lined with Ferodo.
We understand several firms are using this because of the increased coefficient of friction with this material.
Hs{Lord Ernest Hives - Chair}/RB.{R. Bowen}
  
  


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