The short version
- What it is
- Turning the stern through the wind, so the boom swings across and you change from one tack to the other while sailing downwind.
- The key move
- Bear away until you're dead downwind before the boom crosses. A gybe started from a reach puts the boom across fast and full of wind.
- The finish
- Come out at your downwind angle on the new gybe, no higher, and steer straight as the boom lands, or the boat rounds up.
- Best moment
- When the boat is going fastest, for example surfing down a wave. Speed lowers the wind across the deck and the load on the boom.
What a gybe is
Upwind, you change tack by turning the bow through the wind: a tack. Downwind, you change tack by turning the stern through the wind: a gybe (spelled "jibe" in much of the US). The boat never goes head to wind, so the sails stay powered the whole way through. That's why a gybe can barely show on the speed trace when it's done well, and why a rushed one can go wrong very quickly.
The turn is small. From your downwind angle on one gybe to the same angle on the other is usually 40–70° of steering, much less than a tack. Most of the work is in timing the boom and steering the boat straight once it lands.
Gybing a dinghy, step by step
- Look. Check the water you're turning into, and the boats there. Gybing changes your tack, and with it your rights. Gybe onto port and you have to keep clear of boats on starboard (rule 10).
- Call it. "Ready to gybe?" and wait for "Ready." Then "Gybing." Agree the words with your crew, and use the same ones every time.
- Bear away to dead downwind. Steer smoothly, not with a yank. Keep the boat flat with your weight.
- Bring the boom across. As the stern passes through the wind, the boom wants to cross. In a dinghy, help it: grab the mainsheet where it comes down from the boom and pull the boom over, rather than waiting for it to slam across.
- Duck and change sides as the boom crosses. Swap the tiller extension and the mainsheet between hands so you face forward on the new side. Practice that hand swap on land if it feels clumsy.
- Steer straight as the boom lands. The moment the sail fills on the new side, the boat wants to round up. Center the tiller, or briefly steer back the other way, to stop it. That steering correction is the part most capsizes come from missing.
- Settle on your new angle and get the sails trimmed and your weight where it belongs. The gybe isn't over until you're back up to speed.
The centerboard position matters too. Too far down and the boat can trip over it as it turns. Too far up and the boat is less stable. Most dinghies gybe with the board partly down. Ask what's normal in your class.
Gybing a keelboat
The order is the same, but the loads are bigger and nobody can grab the boom by hand. The mainsheet does the work.
- Sheet the main in toward the centerline as you bear away, so the boom only has a short way to travel when it crosses.
- Let it run out quickly, but under control, as soon as it's across. A main held in on the new side pins the boat over and makes it round up.
- Running backstays, if your boat has them: the new one goes on before the boom crosses and the old one comes off after. Get that order wrong and the mast has no support.
- The jib is sheeted across on the new side as the boat turns, if there's no spinnaker up.
In a breeze, read gybing safely before you try it. It covers keeping the boom under control, preventers, and when to tack round instead.
Gybing with a spinnaker
The aim is to keep the spinnaker full while the boom crosses. In brief:
- Symmetric, end-for-end (dinghies and small keelboats): as the boat goes dead downwind the trimmer squares the guy back and the spinnaker floats in front of the boat. The bow person unclips the pole from the mast, clips it to the new guy, and pushes it out on the new side, then clips the other end back onto the mast.
- Symmetric, dip-pole (larger keelboats): the pole is lowered so it swings inside the forestay to the new side. It needs more people and more practice.
- Asymmetric: the old sheet is let go and the new one pulled in, and the sail blows around the front of the forestay to the new side. Timing is the skill. Let go too early and the sail collapses. Too late and it wraps the forestay. On many boats the main crosses just before the spinnaker.
Common faults
- Gybing from a reach. If you don't bear away fully before the boom crosses, it comes across fast, full of wind and high off the deck. This is the violent gybe people fear.
- Coming up too high on the exit. It's tempting: the boat feels quicker, and turning less makes the boom easier. But you're now sailing further from the mark, and you'll have to gybe again sooner, from a worse place.
- Not steering straight as the boom lands. The boat rounds up, heels, and either capsizes to leeward or stalls.
- Gybing slow. Gybing while the boat is slow, off the plane, climbing the back of a wave, or just as a puff hits before the boat has picked up speed, loads the boom most. Gybe at top speed. On a planing dinghy that means once you're up to speed in a puff, or surfing down a wave, when the wind across the deck is at its lowest.
- Crew weight late. If the crew changes sides after the sail fills, the boat heels over at the worst moment.
How much a gybe costs
A good gybe costs less than a tack, because the sails never stop working. The boat slows most around the moment the stern crosses the wind, so measure from that moment, not from when the turn felt finished.
Sail Tactician flags a gybe as a big loss when it loses more than 45% of its entry speed, until it has four of your gybes to compare. After that it measures each gybe against your own usual one. The useful number is yours: what your gybes cost in today's breeze, and whether the bad ones are the ones from a reach, the ones gybed slow, or the ones where you came up too high.
Doing it with Sail Tactician
Training is in beta. Gybes are spotted from your GPS course, so a drill can miss one or count one that wasn't. Trust the trend across a session more than any single rep.
Questions
What is the difference between a tack and a gybe?
A tack turns the bow through the wind, usually upwind. A gybe turns the stern through the wind, downwind. Either way you end up on the other tack with the boom on the other side.
Is it gybe or jibe?
Both. "Gybe" is the British and international spelling and "jibe" is common in the US. They mean the same maneuver.
Why does my dinghy round up after a gybe?
Because the sail fills on the new side all at once, and the boat turns toward the wind. Center the tiller, or steer briefly back the other way, as the boom lands, and get your weight across quickly.
When is the best time to gybe in waves?
When the boat is going fastest, usually as it surfs down the face of a wave. The faster you're going, the less wind there is across the deck, and the gentler the boom crosses.
Sources
Racing Rules of Sailing 2025–2028, rule 10 (On Opposite Tacks). Steps adapted from Sail Tactician's in-app training guide for gybes. Spinnaker gybe techniques are standard club-racing practice. Sail Tactician behaviour from the in-app User Guide, version 3.2.
What changed
- First published.
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