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).
Page discussing the calculation of front to rear braking units and servo ratios in relation to car weight.
| Identifier | ExFiles\Box 5\3\ 03-page138 | |
| Date | 25th September 1926 | |
| R.R. 680a. (50m) (D.R. 175 25-9-26) J.R.D. EXPERIMENTAL REPORT. -4- Expl. No. REF. Hg/Rml/L.G27.E.25. front to rear as 1 over 2, then the total units to the rear are 100, the total units to the front are 50, and of 100 to the rear 25 is direct braking, as on the lighter chassis. In this you assume that because the car weight is doubled, you can get double the braking units with the same pedal pressure. This is manifestly imposible. When you double the braking units available the pedal pressure must also be doubled, and hence the direct braking units will be doubled. The conclusion of the second paragraph should therefore read - "Then the total units to the rear are 100, the total units to the front are 50, and of 100 to the rear, 50 is direct braking". This means that the servo ratio front to rear still remains 1 to 1 and is unaltered by the weight of the car. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||