Ed;
Reck n Destroy.
Well, that 2 blade one did not survive the night with the awesome 8 or 9 mph gusts we had.
Way too much flex and it actually folded forward on itself and had developed several stress cracks around rivets. A couple of spots had problems from being against a square edge a known problem I think.
I'm looking at several other options including an actual formed wing shape with foam injected but im kinda slow with limited ability and none in metal working. Plus that gets away from "pinwheel" and into "formed metal blade" territory.
The most successful version so far is the standard 4 blade pinwheel shape. I'm thinking on a way to do 3 blades. Its mostly the fun and anything learned is icing on the cake.
Cheers.
TomW