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).
Comparison of Lucas and in-house machine performance using output curves, weight, and temperature data.
| Identifier | ExFiles\Box 60\4\ Scan020 | |
| Date | 1st February 1931 | |
| EFC3/AD3.2.31 contd. -4- This curve has been reproduced upon one of our 40/50 forms and curves from our own 40/50 machines have been added (dotted) for direct comparison. A blue print of this set of curves is attached. In comparing the Lucas output curve with the others, account should be taken of the following facts :- The weight of this particular Lucas machine is 36.5 lbs. whereas the weight of our own machine is 31.0 lbs. The temperature rise setting of the Lucas machine is a few degrees higher than the 62c° setting of the R.R. machines. It will be seen, therefore, that the R.R. output is no less and, in fact, greater than that of the Lucas machine on a strictly equal basis of comparison. With regard to E's remark to the effect that we are getting more output from the dynamo by reason of the two-rate charge scheme than we otherwise should, the amount of this is not very great, in fact scarcely more than one ampere more and it corresponds to a temperature rise setting on peak output of about 65c° in place of what used to be 58c°. EFC. | ||