Gybe

According to Wikipedia reference material, the term *gybe* (alternatively spelled *jibe*) denotes a sailing maneuver in which the stern of a vessel crosses the wind line, transferring the mainboom and mainsail from one side to the other while sailing downwind. Unlike tacking, where the bow turns through the wind, a gybe is performed on off-wind points of sail such as broad reach or running downwind.

In practical seamanship, executing a gybe requires clear communication and precise crew coordination. The primary danger of downwind turns is an uncontrolled gybe caused by a sudden wind shift or steering error, which can cause violent boom movement across the cockpit, posing severe injury risks to crew and structural damage to the rig. To ensure a safe maneuver, the crew hauls the mainsheet in tightly toward the centerline before the helm rotates the stern through the wind. Once the mainsail flips across, the mainsheet is smoothly eased out on the new tack.

When mastering essential sailing maneuvers for beginners, sailors also learn to avoid hazardous variations like a "Chinese gybe," where the upper section of the mainsail gybes before the lower part due to insufficient boom vang tension. Understanding how a sail generates aerodynamic forces, as detailed in our guide on how a sail works on a yacht, aids in controlling sail pressure during these downwind transitions. Additionally, nautical terminology distinguishes the gybe maneuver from non-maritime homonyms such as the acronym GY!BE (Godspeed You! Black Emperor).