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).
Modifications and experiments with brake shoes to address sponginess and improve design.
| Identifier | ExFiles\Box 120\1\ scan0024 | |
| Date | 27th November 1930 guessed | |
| (2) It follows also that if the ends of the liners are worn away that brake will appear extra spongy. We think you could prove whether there is anything in this by cutting out about 60° of the middle of the shoe, but preferably do this experiment with the locomotive type of shoe. We are endeavouring to make a satisfactory design in which the liner will in effect consist of 4 pieces of 45° circumferentially and 4 spaces of 45°. The lever type of brake permits this. It also should give the effect of the bedding provided by Mr. Hancock's spring loaded tip, the action of which may be explained in the above paragraph. Regarding the modification of the spring loaded tip in the form of a supplementary locomotive type swivelling shoe, I quite approve of this as a tempory measure, it being quite a passable scheme, and not having the disadvantages of the first scheme. R.{Sir Henry Royce} | ||