Harlon;
You will never get that sewer to work right if you keep stealing pipe for turbine blades!
Looks pretty nice.
Up here above 43 north latitude I think brittleness from cold would be an issue. I only did a couple sets when Zubbly and Woofer were doing them. Thin pipe and too thin and flexy for my liking. They were only 2 foot diameter but flexed very far back. Be sure you build in lots of tower clearance on that size I think.
I love these doer posts. Its what we are here for and all that.
Hope it works well for you. I think you may be infected now with the turbine virus. No known cure.
Tom
"Education consists mainly of what we have unlearned."--Mark Twain