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).
Diagram and calculations for foot brake pedal ratios for front and rear brakes.
| Identifier | ExFiles\Box 120\2\ scan0332 | |
| Date | 10th June 1938 | |
| -3- 10.6.38. DIAGRAM TEXT: 13.925 4.5 1.35 1.725 1.25" DIA. CYL. 6.5 1.85 4.875 1.75 1.0" DIA. CYL. 1.8 3.25 2:1 6.32:1 CALCULATIONS: Foot Brake direct to Rear Pedal Ratio. 13.925 x 1.35 x 3.25 x 1 x 2 x 6.32 ------------------------------------- = 55.4 : 1 4.5 1.725 1.8 1 1 Servo multiplication fitted with 35º cams RAD.13 Fabric. 2 x .36 x 2 ------------- = 2.94 .7 x .7 Pedal Ratio to Front Brakes. 13.925 x 1.35 x 1.85 x S x 4.875 x 1.23 x 1.7 x 4 ---------------------------------------------------- = 60 : 1 4.5 1.725 1.75 6.5 .785 | ||