As someone who's built a set of PVC, Barrel, and Wood blades, I can tell you that I my wood blade set outperforms the other two by a great margin.
Long story short, I made a video with my barrel blades of running a small 12v television from the 8-13 volts my Ametek generated on a solidly windy day. Watching that video a year later, I couldn't believe what I was looking at. My crappily-built wood blades will generate 25-30 volts in the same conditions. Plus they only weigh about 1 pound, and they are very well balanced.
You will probably notice over time that the flexing / vibration will cause the plastic to warp slightly at the mount point (screw hole) and that they will loosen and wobble more, which will loosen them more......
Your mileage may vary. Woofer has probably had more success than me. Could be the pvc. Could be my poor craftsmanship!
