Comparative table of different front wheel brake schemes.
| Identifier | ExFiles\Box 182\M20\M20.2\ img033 | |
| Date | 29th April 1924 | |
| FRONT WHEEL BRAKE SCHEMES COMPARED SCHEME: Hispano Servo speed: 1/29 Servo ratio Torque out / Torque in: 7 Direct braking without servo assistance: 5.1 P Total braking: 35 P Torque from pedal: 12.8 P Max. dist. car will travel before servo assists: 1.5 ft. Remarks on servo assistance: Lag in servo assistance will not increase with wear. SCHEME: RR. Servo speed: 1/10 Servo ratio Torque out / Torque in: 2.45 Direct braking without servo assistance: 9.7 P Total braking: 32.3 P front / 22.7 P rear Torque from pedal: 6 P Max. dist. car will travel before servo assists: 1.6 ft. with normal brake adj. .023 clce. between shoes and drums. Remarks on servo assistance: Lag will increase with wear on brakes. SCHEME: 'Agreed' Servo speed: 1/30 Servo ratio Torque out / Torque in: 2.45 Direct braking without servo assistance: 1.3 P front / .7 P back. Total braking: 22.8 P back / 21.4 P front Torque from pedal: 6.0 Max. dist. car will travel before servo assists: 2.5 ft. Remarks on servo assistance: Will not increase with wear. SCHEME: M. {Mr Moon / Mr Moore} DES. 60 Servo speed: 1/7 Servo ratio Torque out / Torque in: 2.45 Direct braking without servo assistance: 8.9 P front / 6.7 P back Total braking: 31.4 P front / 23.7 P back Torque from pedal: 6.6 P Max. dist. car will travel before servo assists: 1.05 ft. Remarks on servo assistance: Will increase with wear. | ||
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).