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).
Changing axle ratios and its effect on dynamo cut-in speed for the 40/50 chassis.
| Identifier | Morton\M1.8\ img004 | |
| Date | 1st July 1921 | |
| Another copy for works / details - EH no putting up to design office -2- HsS/LGS. 7. 21. ------------ two - two contd. It will be noticed that changing the axle ratio from 16 X 52 to 14 X 52 we get nearly the same advantage in cutting-in earlier as we do if we fit the 1" longer dynamo on to a car with 16 X 52 ratio. Our opinion is that the dynamo on the 40/50 chassis should cut in at 10 M.P.H. We consider the early cutting-in speed is more essential on our cars than any other because they are run more on top gear low engine speeds. If, however, we have any of the standard Lucas dynamos left on our hands, they could be fitted to cars with 14 X 52 axles. Hs.{Lord Ernest Hives - Chair} K.R. 238A (100 T) (S H.{Arthur M. Hanbury - Head Complaints} 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 | ||