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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).
Secret memo discussing an experiment on four-wheel brakes by removing the non-wrapping shoe.

Identifier  ExFiles\Box 73\2\  scan0226
Date  29th January 1924
  
X. 9940

To Hs.{Lord Ernest Hives - Chair} from DA.{Bernard Day - Chassis Design} S E C R E T. DA{Bernard Day - Chassis Design}2/M29.1.24.

E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C.
FOUR WHEEL BRAKES. X. 9940

We telegraphed to you this morning suggesting
trying removing the non-wrapping shoe from the rear axle
so as to get the benefit of the wrapping shoe only, which
we understand from your figures raises the apparent co-
efficient of friction from .43 and .84 and should thus
give us a further drop of half in the work done by the
servo. We suggest this as a test, to see what the
effect is, and if people were agreed that it was an
advantage we could design some all-wrapping shoes either
on Perrot's linesor on our own lines, suitable for the
back brakes. Since we had this idea we believe Mr.
Royce has wired you practically agreeing to a slow speed
servo, in which case the urgency of this experiment is
less.

DA.{Bernard Day - Chassis Design}
  
  


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