Carving looks good so far....... very good.
Was that roughed with the chainsaw?
I am a bit twitchy around the bung hole about 10' with no furling. A big wind through those blades will be 30kw and more to try to look after. If your alternator is very stiff, you will possibly control it.... if not stiff enough, it will leave the coils smashed and tangled.
50mph winds here are common, and if shorted, my 4m unit was no problem, but if it was running without furling, it would end up in New Zealand, no hope of keeping it under control if I didn't short it out in big winds. Furling gives a good degree of safety, but it is not infallable. The physics look good, but in the real world, the mill can do odd things in wild winds, and can track without a tail for short times.... enough to cause problems..... but it is a far cry from no furling.
You really need a plan B... so try furling ..........of any kind... better than no kind. Big winds are scary when they get out of hand, and a well carved set of blades can rally take advantage of them....... the toy plastic ones are just not the same.