My New Wind Turbine Design

This is my new wind turbine with dual, counter-rotating props. I wasn't sure how this would work, but so far it looks pretty good.
If both props are rotating at the same speed the difference is twice that speed.

The wind turbine in the back yard

I built this with PVC tubing and scrap wood, it's suitable for generating electricity, just needs to be mounted to an alternator or a generator. Getting the electricity into usable form is more complex and expensive than making a giant pinwheel like this, but you have to start somewhere, and it's nice to watch on windy days.