yes, the blades are modified some. I impravised- used own judgement,etc. -Since these blades are so short, I had to go with steeper angles for purpose of start-up. I am still in need of learning more about tsr though. But I must be in the ball park, cause these blades are doing terrific. That airfoil shape is AMAZING. Even in a little 10 Mph tiny wind they take off like an airplane propeller. And to think just last fall I was experimenting with flat 1/4" plywood blades on that same motor.(Im emmbarrased now) I could only reach 10v in a hurricane wind! Anyway as I said in the post, 4 blades would've been even better for the winter months. The cold temperatures outside make the grease in the ball bearings alittle thicker, which means alittle more difficult starts -- and with only a 4 ft rotor , 4 blades would start up better on those 10mph cold wind days. Now that we just had two 50 degree F days, the 3-blades starts up even easier now since the grease in the bearings is warmer. On a warmer day it starts up many many times on a common 10mph low wind day.(since the breeze frequently stops and goes)

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