Personally I have made many vawt turbines but never made one that I was willing to hook up to make electric power yet. Most either didn't make enough power to follow through on or were constructed for testing and were not sturdy enough to attach to a suitable generator and transmission. I did find that while vawts work in gusty turbulent flow the power seemed to be reduced by more than I expected. Wind speed cubed bites on extracting power as average wind speed drops. You have to get above the trees. The next project is to put some up on a tower in cleaner air.