Just received a set of blades from windynation and I'm very happy with them. I've been selling the airx blades from thermodyne for years now and havn't been very happy with them. Here in alaska it isn't un common to get 100 mph gusts in the winter time which destroys the black nylon blades from thermodyne. The aluminum blades from windynation seem to be much better at taking abuse. Also these are great for the use of automotive style PMA's because the rpms can go up to 3000 rpms in gusty winds. So far Im very happy with them and have already put my orders in for many more sets to sell to my customers. THANKS WINDY NATION!!! I currently have this turbine on a 20' 1.5" schedule 80 pipe cemented into the ground. The convection wind we get here is great the turbine starts spinning around 10am and doesn't stop till the sun goes down about 10pm here. Tons of power. The carbon fiber black blades only spun the generator a few times a day which disappointed me so when I came across these blades I thought well how much better can they really be? Now I'm frantically ordering stacks of these blades for all my turbines If you have thermodyne, airx, or other nylon carbon fiber based blades throw that junk away and put a set of these blades up you won't regret it.