Next message: Mike Maurice: "Re: T&T: Watching Shuttle Launch"
My calculations on wind drag were based on a boat headed directly into the
wind. Anchoring in a strong wind is a slightly different situation. Most boats
with forward superstructure or high bows veer or "sail" at anchor. They take a
slight angle to the wind, then sail to one direction or the other until
straightened out by the pull on the anchor rode. They then sail in the other
direction and the process repeats. This changes both the projected area and the
coefficient of resistance. The load on the anchor and rode increases by as much as
30% over the load when the boat is headed straight into the wind.
Researchers at MIT determined that peak anchoring loads can be significantly
reduced by flying a riding sail, even on trawlers. A riding sail is a small,
heavy weight sail flown on the aft end of the boat, as close to the stern as
you can get it. This sail acts like the feathers on an arrow and keeps the boat
pointed directly into the wind. It virtually eliminates "sailing" at anchor,
eases the load on the rode, and stops the anchor from working out.
Larry Z
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