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).
Testing a wind-driven aero dynamo and a 12 Volt Bijur dynamo with combined cutout and regulator.
| Identifier | ExFiles\Box 31\1\ Scan066 | |
| Date | 22th July 1920 | |
| Contd. -4- EFC1/T22.7.20. aero dynamo and we have completed the open circuit volt speed curves of Mr. Northey's wind-driven aero dynamo, both for the uncontrolled and controlled conditions. These are rather instructive, and will be issued separately. The speeds in these two cases, are, of course, very much higher, therefore the curves are not comparable with those for the chassis dynamos. 12 Volt Bijur Dynamo Operating with Combined Cutout & Regulator. X.3231. The setting of the cut-out and vibrator regulator belonging to this machine is certainly not correct as received. We have not yet unsealed the vibrator, but have been taking the performance with the regulator as received. To begin with, on open circuit conditions (dynamo operating on voltmeter only) the cut-in operates too early, namely at 5.5. volts cold at 410 R.P.M. The voltage then rises normally up to 14.0 and 570 R.P.M. at which point the vibrator begins to operate. The operation of the vibrator, however, is very erratic and no smooth curve of open circuit voltage could be taken from this point onward (such as was obtained for the Bijur dynamo taken from 49-GB and issued under cover of our EFC5/T22.1.18, together with other curves showing alround satisfactory operation.) The voltage appears to drop, at one point, below 11 and to rise again and be maintained at speeds over 1800 R.P.M. to a value in the neighbourhood of 12.7. The curve is very similar with the machine in a hot condition with the exception that the cut-in operates and the vibrator regulator begins to operate at somewhat higher voltages and speeds. As would be expected from this open circuit volt curve, the ampere output speed curves, when Contd. | ||