accidental jibe
An accidental jibe happens when the boat is steered or the wind shifts such that the stern of the boat accidentally passes through the eye of the wind. This causes that main boom to swing violently to the other side of the boat.
Accidental jibes do happen. So when the boat is running downwind, if someone has to walk up or down the boat sides, it has to be on the same side as the boom.
When going ashore, you have to be very properly anchored, without any doubt.
The rig features a loose-footed, full-batten mainsail, so there is no boom to worry about during an accidental jibe. There is an internal halyard and a mainsheet on a four-part purchase, and that's it: two control lines on the boat.
Capsizing usually results from heeling to far or an accidental jibe. If you feel your in real danger in tipping over, luff the main sail at once, by letting the main sheet fly. If your boat does go over on its side, stay with it, never swim away.
Just a simple line tied to the boom and tied on someplace forward to prevent an accidental jibe.
A point of sail where the boat has the wind coming from aft of the boat. Running can cause the danger of an accidental jibe. Used to describe a line that has been released and is in motion. Sailing with the wind blowing from astern, sailing downwind.
Jibe: To change direction, when sailing with the wind aft, so that the wind comes on a different quarter and the boom swings over to the opposite side; an accidental jibe can be dangerous.
Jiffy Reefing: A reef that is tied in.
A preventer, or jibe-guard, is a mechanical device on a sailing vessel which limits the boom's ability to swing dangerously across the boat during an accidental jibe.
Preventer - (1) Line and blocks or the boom vang used to keep the boom in place while reaching or running and to prevent an out of control swing during an accidental jibe.
 See also: Boat, Sailing, Wind, Stern, Jibe
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