HAWT - Horizontal-Axis Wind Turbine
VAWT - Vertical-Axis Wind Turbine
So here's the dilemma. A HAWT is way more efficient, but it generally requires elevation. VAWTs are much less efficient because half the time they are fighting the wind, but they have the ability to be down low to the ground. Since I'm renegade, I am going to opt with HAWT and build a tower somehow =D. Other groups seem to have opted for VAWT, at the beginning I didn't understand why, but I hadn't considered the height limit of 3m. With that limit, it's probably best to make a VAWT since the wind will be so irregular down low.
I've got two plans going simultaneously as a result: (both HAWT)
Plan A involves three thin flat boards of wood. The thin boards will be mounted on a circle of wood at an angle using triangular blocks of wood. This will make a drag windmill I assume, since the air hits the blades and makes them turn.
Plan B involves some online instructions here. I've scaled them down to 50% and then squashed that a bit to allow it to fit my scrap wood boards. So far I've got three blade cutouts, but no shaping has been done yet. I think I might have to go to my friend's house to use his band saw. These blades will be much better once finished, but they will take considerably more work to construct. The tips of these guys are going to be very thin, so I may end up coating them in fiberglass for strength even though epoxy is rather heavy.
I'm still unsure of the bearing setup. I will most likely end up using the armature from the fan that I stole from the dump. In this case, it might be smart to build a rotor the same exact size as the one that originally matched the fan motor. We'll see how the magnet collecting turns out... I may want to buy a bunch that are the same size to fit with the armature that I have.
Thursday, April 17, 2008
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