I am planning a tower with a height of around 40 ft. Turbine will have 10.6 to 13 ft dia blades. Max distance from top Guy wire will be 6-7 ft for blade clearance. Tower top weight will be close to 100 lbs. My question is this: What dia pipe should be used? I'm looking at 4" x .100 wall and 4" x .187 wall. Enough? I plan furling around 25mph and brake if winds are consistently over that. I watched MN's video on loading but he didn't go quite to my scale. Thanks.