It's interesting. I find that up here (and it is turbulant around here) machines tend to twist up slowly - but consistantly in teh same direction. Which way it twists up I believe has a lot to do with which way it furls. When running in a gusty wind - if the gust hits it in such a way that the tail can lift - then sometimes the machine will mostly stay put and the tail will lift. If it hits on the other side, the machine will yaw. So it's more inclined to yaw one way than the other I think.
The way in which its likely to twist up is also the the way it needs to turn when it's furling. If your's twists up and is prevented from further yawing - it will likely prevent furling and if the machine is running at that time it only takes once. A machine that can't furl is likely to burn out and will also put a much greater load on the tower than it normally would. I'd not inhibit the yawing on this - if you're that worried about it I would look into making slip rings.
Another good policy might be - unplug it at the bottom of the tower when your not around, and plug the line into a dead short. Then, perhaps when your gone the machine can turn freely with the whole line and nothing will twist up and the machine will remain shut down. That might solve both our concerns![ Parent ]