Don't forget to add the radius of the blades when calculating where things might fall.
I don't trust towers to stay up. I don't trust anchors to hold. I don't trust cables to not brake. And I don't trust blades to stay on.
Figuring out that last is the most fun. Fortunately my preferred site for erecting the tower puts it not-exactly-crosswind to the house for both the prevailing winds and the typical storms, with lots of "fly room" for the blade. So I plan to put it up such that it can fall in any direction and miss everything, while the blade has to fly nontrivially more than the tower height to hit anything and it has ten times the tower height to anything but the road and the house.
Flying blades is a great argument for foam blades, though. Think "Nerf". B-)
