Rolls-Royce Archives
         « Prev  Box Series  Next »        

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 memorandum detailing design changes and instructions for the RRM Brake System.

Identifier  ExFiles\Box 73\2\  scan0306
Date  27th March 1924
  
X.9940

To BY.{R.W. Bailey - Chief Engineer} HS{Lord Ernest Hives - Chair} - FROM DA.{Bernard Day - Chassis Design} S E C R ET. DA{Bernard Day - Chassis Design}1/M2 7.3.24.

E.A.C.

RRM. BRAKE SYSTEM. X.9940

Referring to N.sch.1769 - the thread
in the screw was intended to be 45°. We did
not instruct it as we intended Mr. Stent to send
you full particulars of this operating gear.

Will you now please make the levers on
the pressure screw gear 2.625 instead of 1.8 as
shewn, and drop the thread to 30°. 2.625 is
the longest lever that can be got in without
fouling the change speed shaft.

On the agreed scheme the lever cannot
be more than about 2" long, and ought to be less.
In this case the thread should be made 30° also.


DA.{Bernard Day - Chassis Design}
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙