Dave,
"It seems set a bit higher than I'd like watching it fully furl and hold only after a constant 25+ Mph. Here it is running over 200 rpm and 100 VAC. 3 phase. Measured output at my hot water heating elements has peaked over 4500 watts"
Have you updated your performance chart?
Your 240v/3600w heating elements have a 16 ohm resistance.
To get 1500watts per leg as in your quote, you'd have to be cranking 155v, and that isn't even on your chart and way higher than 200rpm.
But, your furl is around 25mph ?, so how can you be cranking that high rpm or volts??
Is it still spinning like a top while fully furled and that is why you applied brake?
Keep up the good work ..encouraging to see someone making that much juice and not having it blow apart in strong wind ..overbuilding is the way to go ..nothing marginal would have still been flying!
Stew Corman from sunny Endicott