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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).
Brake area and weights of the Peregrine model, comparing it to the 25hp model and suggesting an increase in rear drum width.

Identifier  ExFiles\Box 1\10\  B001_X106 TO X 110-page001
Date  19th August 1932
  
X106.

To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/KT.19.8.32.


PEREGRINE BRAKE AREA.

The Peregrine Wts. are } .637 tons front
Empty } .75 tons rear.

The brake areas/subtracting rivet countersink
area) are 74 sq.ins front and rear.

This gives, Brake area/Ton. Front 116 sq.ins.
Rear 98 sq.ins.

The present 25 hp. brake area is Front 72.1
Rear 123.0

Incidentally the deficiency in front brake
area on the 20/25 is clearly shewn up on our
10,000 miles tests, the front drums usually being
the ones that score.

The point we wish to make is, can the Peregrine
rear drum width be increased 10% or so without
complications? If so it would make a better braking
system though the existing proportions are not at all
bad. We compared them with other cars in Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/AD6.12.30.


Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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