Experimenters wind turbine blades
These are heavy duty ABS plastic blades for building small experimental wind turbines. When put together in a 3 blade configuration they measure 34 inches in diameter. Below is a shot of them laid beside a 3 ft ruller...
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Below are some shots of a small alternator with the blades mounted on a plywood disc...
Below it's assembled
The bearing assembly is an old broom stick drilled to accept 1/4" bearings and glued to the plywood hub. The steel disc holding the magnets is simply screwed to the plywood disc as well. The coils are pinned down to the plywood using safety wire although you could simply use some copper wire to hold them as well. This one wasn't meant to be a big worker but it does charge batteries at a half amp or so in moderate winds. Lots of fun! Fun quick project.