At the Wessex SEC D-Day crank up on Thursday, there was a generator of a type I've not seen before. A small JAP industrial engine (throttled not governed) drove two 12 volt car dynamos (not alternators), one direct drive, the other vee belted from the shaft.
Photos here ........
The engine & dynamos are enclosed by a professional-looking steel tube framework and a properly constructed panel at one one supported a couple of boxes, one a standard Lucas FADE regulator & the other an aircraft 24 volt box. There appears to be a diode (possibly a Zener) added on to one of the bolts.
The interesting thing is that it produced 240 volts - or at least had done a year ago. On Thursday it just produced noise & exhaust gas!
Rob Armstrong commented that he recalled seeing an article in an amateur mechanics magazine just after the war which explained how to rewind a car dynamo to be an alternator. He'd done so, eventually getting 110 volts out of it - but it didn't last long!
If this is one of they, why two dynamos? & if it isn't why two dynamos at all?
Any information would be much appreciated by both myself & the owner.
Regards,
Kim Siddorn