What is a gybe (jibe), and why can it be dangerous?
How it works
Unlike a tack, the mainsail can remain powered as the vessel turns downwind. The boom and mainsheet may therefore cross the boat quickly and with substantial force.
A deliberate gybe demands communication, a clear cockpit, and boat-specific sail handling. An accidental gybe can seriously injure crew or damage the rig; never treat a short generic web checklist as a substitute for competent practical instruction.
Bow through versus stern through
The easiest distinction is geometric. In a tack, the bow crosses the eye of the wind and the sails briefly luff. In a gybe, the stern crosses the wind while the mainsail transfers through a much larger arc.
On the water
- A boat changes from one broad reach to the other by gybing.
- A small course wobble while running can trigger an accidental gybe.
- The crew keeps heads and bodies clear of the boom and loaded mainsheet.
Common mistake
Turning the bow through the wind is a tack, not a gybe. Calling the gybe merely a downwind tack hides the much more forceful boom movement.
Remember it
Tack: BOW through. Gybe: STERN through.