| I am in the process of designing a vertical axis windmill with three thirty foot blades and thirty foot in diameter. I plan on putting it on a forty or sixty foot freestanding tower and use hydraulics to bring the power from the head to the gen set or alternator on the ground. I am planning a closed loop hydraulic system with a pump a motor two accumulators and the high pressure piping. The blades will articulate into the wind on both the windward and lee sides with a tail vane. so they will drive on both sides of the windmill and they are basicly flat mostly hollow, with rounded edges. It will also have a govener to flatten out the blades in higher winds and push them out like air brakes to slow it down. I already have the basics figured out my next step is to find out if I can use a hollow shaft for the head. I saw an earlier post and some one reccomended 1% of the blade diamenter. Does this also work for vertical if so my shaft will have to be 3.6" inches or more in diameter. Or should I find an engineer to make sure everything is strong enough to stand up to Kansas winds and drive one of the industrial alternator my uncle has. This machine was inspired by one of the websites I found and he also post on this site.
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