Those are both excellent sugestions....but, again, I'll have to wait a bit for conditions to be right for a more demanding test. Or, perhaps I'll rig up another load, one without an internal thermostat. Either way, I will keep you posted. And, should anyone else beat me to it- my feelings won't be hurt at all!
Too bad I don't have thermocouples or other means to check the temperature inside the reel. Otherwise I'd offer to do a test with a solid 2000W heater without thermostat.
I'd be interested in obtaining a photograph like this for a safety alert I'm publishing. We've had a few serious incidents related to this kind of thing. Tried to PM the poster but no response. If anyone else has anything similar, maybe you could post it or PM me. It might save somone some day.