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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).
Performance of Ferodo material versus cotton fabric for brakes and clutches, particularly when exposed to oil.

Identifier  ExFiles\Box 26\4\  Scan066
Date  11th November 1918
  
To R.{Sir Henry Royce} from EH.
c. to CJ.
c. to E.{Mr Elliott - Chief Engineer}
c. to By.{R.W. Bailey - Chief Engineer}
c. to Da.{Bernard Day - Chassis Design}

X719

EH1/LG11.11.18.

X.3409:-FERODO BRAKES & CLUTCHES.

The Ferodo used on the foot brakes of the car is undoubtedly a success. If, however, any oil gets on to it the brake becomes ineffective, but once the oil has been burned or cleaned off the Ferodo appears as good as ever.

We have lately used thin Ferodo discs on the friction controlled sunwheel. We have not had a very great success with these thin discs. The chief reason seems to be that the Ferodo becomes soft with oil and becomes loose where it is rivetted. We reckon the best material for parts such as clutches is the cotton fabric similar to the clutch fabric used on the car. We have never seen one of these cotton fabric destroyed, and we know from past experience they are absolutely a success. Our own views are that Ferodo is the best material on any type of brake which gets very very hot, but for any brake or clutch which runs in oil and becomes fairly hot, cotton fabric is very much the best material.

EH.
  
  


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