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).
Comparative table of clutch pedal ratios for various clutch systems.
| Identifier | ExFiles\Box 85\2\ scan0206 | |
| Date | 19th November 1935 | |
| To Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}: x~12 Hs{Lord Ernest Hives - Chair}/Smth:9/KW.19.11.35. Clutch Pedal Ratios. | | Old Std. Bentley (Fabric on Flywheel). | New Bentley N.Sch.3948 (Fabric on Plate). | 10" Borg & Beck with shortened operating lever. | 11" Borg & Beck. | |---|---|---|---|---| | Finger Ratio | 3.87 | 4.68 | 5.34 + | 5.34 + | | Pedal to Trunnion | 8.75 | 8.75 | 7.0 | 7.0 | | Overall | 33.9 | 40.9 | 37.3 | 37.3 | + Subject to confirmation. Hs{Lord Ernest Hives - Chair}/Smth. | ||