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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).
Test report comparing the performance of different brake shoe designs and their braking power.

Identifier  ExFiles\Box 73\1\  scan0071
Date  12th July 1923 guessed
  
Type of shoe. | DESCRIPTION. | SKETCH. | Initial drum r.p.m. | Final drum r.p.m. | W. | REMARKS.
2A. | Standard. | Standard. | 473 | 315 | 15 | This test made for the sake of comparison with those below as springs were not fitted in previous tests with std. wrapping shoes.
| | | 550 | 315 | 20 |
W | Shoe split at toggle end - Link free at both ends. | [Sketch of a split brake shoe with a free link at both ends] | 473 | 315 | 6 | Trouble was experienced with the segments fouling, not allowing the toggle end to function well - higher reading not taken due to above.
| | | 550 | 315 | -- |
X | Shoe split at toggle end - Link rivetted to toggle end and free pivot end. | [Sketch of a split brake shoe with a link riveted at the toggle end] | 473 | 315 | 6 | The braking power of tis shoe seems to be identical with shoe 'W' but in this case the bedding was uniform, both segments of the shoe being in operation at the same time. See also Sheet 3.
| | | 550 | 315 | 10.4 |
Y | Shoe split in centre. Diag. free link. | [Sketch of a brake shoe split in the center with a diagonal free link] | 473 | 315 | 5 | The most powerful shoe yet tried. Pivot end comes into operation first followed by toggle end on harder application of lever.
| | | 550 | 315 | 9 |
Z | Shoe split in centre. Horizontal free link. | [Sketch of a brake shoe split in the center with a horizontal free link] | 473 | 315 | 8 1/2 | More powerful than std. but unsatisfactory owing to rubbing in 'off' position and link at wrong angle. Higher reading not taken due to this
| | | 550 | 315 | -- |
X | As above but ferodo on toggle end only. | [Sketch of a brake shoe with lining on the toggle end only] | 473 | 315 | 8 | See sheet 3. Higher reading not taken.
| | | 550 | 315 | -- |
  
  


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