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).
Dynamo charging curves and concluding the current dynamo output is insufficient for present requirements.
| Identifier | ExFiles\Box 163\6\ img105 | |
| Date | 9th December 1930 | |
| El/M9.12.30 contd. -2- In our original memo El/M24.12.29 we advocate that the reduced charge should be three quarters of the then normal charge, and indicated that it would still be necessary to run on 'no charge' at times in summer to avoid overcharging. We note that the latest reduced charge curve No.3 (EFC.26.11.30 shews a maximum value of 10.5 amps. when plotted with relation to schedule terminal volts. We should be interested to see this curve plotted also at 14 terminal voltage. El/M3.12.30 suggests a scheme to have full charge on for S and T. as well as H S & T. Would the dynamo output have to be much reduced? This has the advantage of early cutting in. We have looked into the alterations required for this scheme and believe it can be accomplished by modifying a few of thr simple pieces of the switchbox, provided we accept a battery brush always on contact with the lamp switch armature. In conclusion, it is agreed by all concerned that the dynamo output is now found to be too small for our present requirements, and it is therefore an urgent matter to put in hand experimental machines of greater capacity. E.{Mr Elliott - Chief Engineer} | ||