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).
The performance and design of various dynamos, including Bosch, Liberty aero, and Bijur models.
| Identifier | WestWitteringFiles\E\July1920\ Scan28 | |
| Date | 22th July 1920 | |
| R.R. 199 (250T) (SD676 19-7-17) MP180865 Contd. -4- EFC1/T22.7.20. shunt wound dynamo for the car, it would be advisable to look into the details of the design of the Bosch machine rather closely. X.3206 y.4064 We have also done a little work on the Liberty 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, but 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 Cut-out & 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 at 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 Contd. | ||