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).
Comparison table of different front wheel brake schemes and their performance characteristics.
| Identifier | ExFiles\Box 22\1\ Scan175 | |
| Date | 29th April 1924 | |
| TITLE: FRONT WHEEL BRAKE SCHEMES COMPARED. COLUMN HEADERS: Scheme. Servo speed. Servo ratio Torque out / Torque in Direct braking without servo assistance. Total braking. Torque to servo from pedal. Max. dist: car will travel before servo assists. Remarks on servo assistance. TABLE DATA: Row 1: Scheme: Hispano. Servo speed: 1/29 Servo ratio: 7 Direct braking: 5.1 P Total braking: 35 P Torque to servo: 12.8 P Max. dist: 1.5 ft. Remarks: Lag in servo assistance will not increase with wear. Row 2: Scheme: RRM. Servo speed: 1/10 Servo ratio: 2.45 Direct braking: 9.7 P Total braking: 32.3 P front, 22.7 P rear Torque to servo: 6 P Max. dist: 1.6 ft. with normal brake adj. .023 clce. between shoes and drum. Remarks: Lag will increase with wear on brakes. Row 3: Scheme: 'Agreed' Servo speed: 1/30 Servo ratio: 2.45 Direct braking: 9.3 P front, 8.7 P back. Total braking: 22.8 P back, 21.4 P front Torque to servo: 6.9 Max. dist: 2.5 ft. Remarks: Will not increase with wear. Row 4: Scheme: M.{Mr Moon / Mr Moore} DES. 60 Servo speed: 1/7 Servo ratio: 2.45 Direct braking: 8.9 P front, 6.7 P back. Total braking: 31.4 P front, 23.7 P back Torque to servo: 6.6 P Max. dist: 1.05 ft. Remarks: Will increase with wear. | ||