I do not plan to increase my wire size (5/16inch) but just trying to get an understanding of the dynamics of the rig tension- Thanks.
One thing I find interesting is that it seems sailboat rigs seem so fickel, when all around us are power poles and guyed antennas that get almost no inspections and still stay up. Seems they are using galvanized wire. Do large antennas need to have their guys replaced evey so many years? Some of these antennas are huge and the wind load must cycle them just like a sailboat rig. The below tower is 1000 feet tall and has an elevator to get to the top- located in Baltimore MD.
Yes the fatigue life of galvanized wire is better than stainless. However sailboat rigging also sees lots of other loads, not just wind, from people, other boats etc. You also have to be aware of conditions where the pull is not exactly fair. Anything that bends the wire rope during loading and unloading really shortens the life of the wire.
Gary H. Lucas