Rolls-Royce Archives
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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).
The pressure distribution for a 40/50 front wheel brake system, comparing standard and modified arrangements.

Identifier  WestWitteringFiles\L\2Jan1924-March1924\  Scan1
Date  12th July 1923
  
R.R. 403A (40 H) (SL 42 12-7-23). J.H.D.
(1)
Expl. No. 9940 REF: He/AGL1/L92.1.24.
EXPERIMENTAL REPORT.
DISTRIBUTION OF PRESSURE ON 40/50 FRONT WHEEL BRAKE SYSTEM - STANDARD ARRANGEMENT.
Servo ratio T1/T2 = 17.5 (Expl. value).
P = pedal pressure.
The pressure p (at shoes) is taken at the point of greatest movement of the shoe face (ferodo) Its greatest movement is approx. at centre of shoe.
FRONT BRAKES.
Effective press: at shoes = P (14.75 X 2.75 X 5 X 3.25 X 3.3 X 4.5 X .2) / (6.18 X 3.25 X 7 X 6.30 X 2.8 X .8 X .09) = 10.95 P
REAR BRAKES.
Effective press. = P (14.75 X 2.75 X 2 X 2.275 X 17.5 X 2.25 X 2.755 X 7 X .2) / (6.18 X 2.5 X 7 X 3.05 X 2 X 3.25 X 2.75 X 1 X .09) = 53 P
PRESS: WITH MODIFIED ARRGT: (As given for A, B, C, and D.{John DeLooze - Company Secretary})
FRONT BRAKES.
Effective press: at shoes = 14.25 P
REAR BRAKES.
Effective press. at shoes = 14.3 P
TENSION IN OPERATING ROD TO SERVO (T.)
STD: ARRGT:
T1 = P (14.75 X 2.75 X 2 X 2.275) / (6.187 X 2.5 X 7 X 3.05) = .56 P
MODIFIED ARRGT:
T1 = P (14.75 X 2.75 X 2 X 1.25) / (6.187 X 3 X 7 X 5.175) = .151 P
contd :-
  
  


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