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 :- | ||
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).