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).
Chassis performance for climbing steep hills, considering gearing, brakes, and the effect of larger wheels.
| Identifier | ExFiles\Box 180\M5\ img036 | |
| Date | 27th August 1921 | |
| contd: -4- R5/G27.8.21. E.P. and a chassis which could be loaded up suitably so that they could find what weight our present chassis would perform the test they require, and therefore get a very fair idea of the best gear to suit their purpose. In conclusion, you will see that the moment I heard they wished us to climb a steep hill with 4.3 tons I told all those concerned that our chassis would not do it unless it was lower geared, and then it would require still more powerful brakes. It will also be remembered that the road wheels of 38" diameter have been fitted by Air Ministry instructions, these being about 10% larger than our standard wheels will reduce the tractive effort available 10%, and therefore take about 5 cwts. off the weight capacity of the chassis for climbing steep hills. R.{Sir Henry Royce} C F & S LTD., 1/2M 2/21 P.377(R.R) | ||