Gybing — The Turn Beginners Are Told to Be Careful About
The difference between a nice gybe and an exciting gybe can sometimes be about half a second.
Sooner or later, almost every beginner sailor hears the warning:
“Be careful when you gybe.”
Sometimes it is delivered in such a serious tone that you could be forgiven for thinking gybing is an emergency procedure rather than one of the normal ways of turning a sailing boat.
It is certainly a manoeuvre that deserves respect.
The boom can cross the boat surprisingly quickly. If you are not expecting it, the result can be a bump on the head, a sudden lurch, a badly timed scramble across the boat or, in stronger winds, a capsize.
But there is an important distinction to make.
Gybing is not inherently dangerous. Uncontrolled gybing is the problem.
Once you understand what is happening, anticipate the movement of the boom and learn to control the turn, a gybe becomes another routine sailing manoeuvre.
And eventually it can become an extremely satisfying one.
A good gybe can be remarkably smooth: the boat turns, the stern passes through the wind, the boom crosses under control, the crew changes position and the boat continues on its new course almost without losing speed.
That is what we are aiming for.
First: What Exactly Is a Gybe?
In the previous lesson we looked at tacking.
When you tack, the bow of the boat turns through the wind.
For a moment the boat points directly into the wind, the sails stop driving properly and then they fill on the opposite side.
A gybe is different.
When you gybe, it is the stern of the boat that passes through the wind.
You are normally sailing somewhere between a broad reach and a run.
Instead of turning the front of the boat towards the wind, you turn the boat so that the wind moves from one side of the stern to the other.
That may sound like a small difference.
It is not.
It changes what happens to the mainsail completely.
Why Does the Boom Move So Quickly?
Imagine sailing downwind.
The mainsail is well out to one side of the boat because the wind is coming from behind you.
As you alter course, there comes a moment when the wind changes from entering the sail from one side to entering it from the other.
At that point the sail wants to move to the opposite side of the boat.
And attached to the bottom of that sail is the boom.
So the boom moves too.
Sometimes very quickly.
When tacking, the sail usually loses much of its driving force as the boat passes through the wind.
During a gybe the mainsail can remain powered for much more of the manoeuvre.
That is why the movement can feel more dramatic.
It isn't simply the boom wandering gently from one side to the other.
It can accelerate across the cockpit.
That is the part we need to control.
The Golden Rule of Gybing
If there is one thought I would like a beginner to remember, it is this:
Know when the boom is going to cross before it actually crosses.
The unpleasant gybes are usually the unexpected ones.
If you are prepared, you can:
lower your head;
move your body;
control the mainsheet;
keep the boat balanced;
straighten the tiller;
and continue sailing.
If you are not prepared, everything seems to happen at once.
Boom!
Duck!
Tiller!
Sheet!
Move!
Why is the boat leaning?
Where are we going?
That is when sailing becomes unnecessarily exciting.
A Simple Controlled Gybe
Different dinghies require slightly different techniques, and in stronger winds you should practise with an experienced sailor or instructor.
But the basic sequence is straightforward.
1. Look Around Before Turning
Just as with a tack, the first step happens before you touch the tiller.
Look around.
Is another boat behind you?
Is someone overtaking?
Are you approaching a riverbank, mooring, buoy or pontoon?
Do you actually have room to complete the manoeuvre?
Beginners understandably become absorbed by what is happening inside their own boat.
But sailing is taking place in a much larger environment.
Before any significant change of course:
Look first.
2. Prepare the Boat and Crew
Make sure everyone knows that a gybe is coming.
In a crewed boat, communication matters.
You may hear commands such as:
“Ready to gybe?”
followed by:
“Ready.”
Different clubs, boats and instructors may use slightly different wording, but the principle is the same.
Nobody should discover that the boat is gybing because the boom has just arrived above their head.
The helm should know:
where the crew is;
where the mainsheet is;
where the tiller extension is;
and where they are going to move.
The crew should know what the helm intends to do.
3. Bring the Boat Onto a Run
A controlled gybe usually begins by bearing away until the boat is sailing almost directly downwind.
The turn should be positive but smooth.
You do not need a huge tiller movement.
Remember our earlier lesson:
Small steering movements usually produce better sailing than dramatic ones.
As the boat approaches a run, the sail will be well out.
This is the point where the helmsman needs to become particularly aware of the boom.
Controlling the Mainsheet
This is one of the most important parts of the manoeuvre.
If the mainsail is fully out and you simply continue turning, the boom may travel a long distance across the boat before the mainsheet stops it.
That creates a much more violent gybe.
So we try to reduce that uncontrolled travel.
One common technique is to sheet the mainsail in before the boom crosses.
You are not hauling the sail tightly into the centre of the boat and holding it there indefinitely.
You are reducing the distance the boom will travel.
As the stern moves through the wind and the sail changes sides, the boom has much less distance over which to accelerate.
The mainsheet can then be eased again once the sail has crossed.
The exact technique will depend on the boat and mainsheet system.
On some dinghies you may physically control the mainsheet falls as the boom comes across. On others the preferred technique may be slightly different.
This is one of those manoeuvres where spending ten minutes with an experienced sailor in your particular class of boat is worth far more than memorising a theoretical description.
But the principle remains:
Do not simply let the boom fly uncontrollably from one extreme to the other.
Now the Stern Passes Through the Wind
Continue turning.
At some point the stern crosses the direction from which the wind is blowing.
The airflow changes sides.
The mainsail begins to move across the boat.
This is the moment you were waiting for.
Not a surprise.
Not an emergency.
You knew it was coming.
Duck beneath the boom.
The sail crosses.
Move your weight as necessary to keep the boat balanced.
The important point is not to panic and throw yourself across the boat.
Move deliberately.
Straighten the Tiller
One of the classic beginner mistakes is concentrating so hard on the boom that the tiller gets forgotten.
The boat keeps turning.
And turning.
And turning.
What began as a neat gybe ends with the boat heading somewhere nobody intended.
This is very similar to the oversteering problem we discussed when first learning to steer.
Once the boom has crossed and you are on the new course:
Bring the tiller back towards the centre.
Allow the boat to settle.
Ease the Mainsail for the New Course
Once the boom has crossed, the mainsail may still be further in than is ideal.
Ease the sheet until the sail is correctly set for the new point of sail.
Remember our simple sail-trimming rule from Lesson 10:
Ease the sail until it starts to complain, then pull it in just enough to make it happy.
Now you are sailing on the opposite gybe.
You have changed direction without pointing the bow through the wind.
The Whole Gybe in Eight Steps
For a beginner, it helps to reduce the entire manoeuvre to a simple sequence.
Look around.
Tell the crew you are going to gybe.
Bear away smoothly towards a run.
Control or shorten the mainsheet as appropriate.
Allow the stern to pass through the wind.
Duck as the boom crosses.
Straighten the tiller and balance the boat.
Ease the mainsheet for the new course.
At first this sounds like a lot.
After several attempts it begins to become one continuous movement.
Why Keeping the Boat Flat Matters
A gybe is much easier when the boat is reasonably balanced.
If everybody suddenly lunges to one side, the boat responds.
If the boat is already heeling strongly as the boom crosses, the change in sail force can make the movement even greater.
In light conditions this may simply be untidy.
In stronger conditions it can result in a capsize.
Try to move smoothly rather than suddenly.
Your aim is to allow your body weight, steering and sail control to work together.
A sailing dinghy is remarkably responsive.
That is one of the joys of sailing it.
It is also why seemingly small movements matter.
The Accidental Gybe
Now we come to the gybe beginners really should learn to recognise.
The accidental gybe.
Imagine sailing almost directly downwind.
The mainsail is out to one side.
Perhaps you are talking to someone.
Perhaps you are looking at another boat.
Perhaps the wind changes direction slightly.
Perhaps you make a small steering correction.
Suddenly the wind catches the opposite side of the mainsail.
Bang.
The boom crosses the boat before anyone was expecting it.
That is an accidental gybe.
It can happen remarkably easily when sailing directly downwind.
Why Running Dead Downwind Needs Attention
When you are sailing on a reach, it is usually obvious which side of the sail the wind is acting upon.
When sailing dead downwind, the situation becomes less stable.
A small change in:
wind direction;
steering;
boat movement;
or river current
may be enough to change which side of the sail the wind fills.
This is why experienced sailors remain aware of the boom when running.
You may sometimes see the sail begin to behave strangely just before an accidental gybe.
The leech may move.
The sail may momentarily become unstable.
The boom may start to lift or twitch.
Those are useful warnings.
Do not ignore them.
How to Reduce the Risk of an Accidental Gybe
Several habits help enormously.
Avoid Wandering Across Dead Downwind
If you intend to sail on one gybe, maintain that course deliberately rather than meandering from side to side.
Small corrections are fine.
Constant wandering is not.
Know Where the Wind Is
This sounds obvious.
But beginners often spend so much time looking at the boat that they forget about the wind.
Watch:
flags;
burgees;
ripples on the water;
other boats;
trees;
your sail.
Build a constant mental picture of where the wind is coming from.
Keep an Eye on the Sail
The mainsail often gives you a warning.
If it begins to hesitate, flick or fill from the wrong side, something is changing.
If in Doubt, Sail Slightly Away From Dead Downwind
A broad reach is often more stable and more comfortable than trying to balance precisely on a dead run.
Sometimes sailing a slightly longer course is preferable to fighting an unstable sail directly downwind.
The Classic Beginner Gybe
There is a particularly memorable version.
Everything begins perfectly.
The helm announces the gybe.
Everyone gets ready.
The boat turns gently.
Nothing happens.
So the helm turns a little more.
Still nothing.
A little more tiller.
Still nothing.
Then the mainsail finally decides that enough is enough.
WHOOSH!
The boom rockets across.
The helm ducks.
The crew ducks.
The boat heels.
Someone lets go of something.
The tiller is still hard over.
The boat spins rapidly onto a reach.
Everybody looks slightly surprised.
And, after half a second of silence, somebody says:
“Was that right?”
Mostly.
We just need to make it slightly less theatrical next time.
And Then There Is the Gybe Nobody Intended
Another familiar sailing moment happens when everybody is happily chatting.
The boat is running gently downwind.
It feels completely relaxed.
Perhaps somebody is discussing lunch.
Then:
BANG.
Everyone ducks approximately half a second too late.
The boom is now on the opposite side.
There is usually a brief pause.
Then somebody says:
“Did we just gybe?”
Yes.
Technically, an excellent observation.
The important lesson is not simply that unexpected gybes can be funny afterwards.
It is that the wind never stops participating in the sailing simply because the crew have become distracted.
Light-Wind Gybing
Light winds are ideal for practising the mechanics of gybing.
The boom moves more slowly.
The loads are smaller.
You have time to watch what happens.
You can deliberately practise:
approaching the run;
controlling the mainsheet;
noticing when the sail changes sides;
moving across the boat;
straightening the tiller;
and trimming the sail afterwards.
If you are learning, repeat the manoeuvre several times.
Gybe one way.
Sail for a short distance.
Gybe back.
Repeat.
Repetition is how separate actions become one fluid manoeuvre.
Strong-Wind Gybing Is Different
As the wind increases, everything happens more quickly.
The sail is more heavily loaded.
The boom moves faster.
The boat reacts more strongly.
Your weight placement becomes more important.
This is not the moment for a complete beginner to experiment alone.
Practise stronger-wind gybing with someone experienced in the boat you are using and with suitable safety cover.
Some dinghies are very forgiving.
Others demand considerably more precise technique.
High-performance boats can require techniques that are well beyond what we are discussing in this introductory series.
The aim of this article is not to turn a beginner into a racing-dinghy gybing expert.
It is to make the basic manoeuvre understandable.
Do Not Fear the Boom — Respect It
Sailing instructors quite rightly warn beginners about the boom.
It is solid.
It moves quickly.
You do not want to put your head in its path.
But sometimes the warnings have an unintended effect.
Beginners become frightened of gybing.
They tense up.
They make abrupt movements.
They turn the tiller too violently.
They become so concerned about the boom that they stop thinking about everything else.
That does not help.
The better approach is:
Understand where the boom is.
Understand why it is going to move.
Know when it is going to move.
Then make sure your head isn't occupying the same piece of space when it gets there.
That is much more useful than simply being frightened of it.
Tacking Versus Gybing
It is worth putting the two manoeuvres side by side.
Tacking
The bow passes through the wind.
For a moment the sails lose much of their drive.
The boom crosses as the sail fills on the opposite tack.
You are normally changing direction while sailing towards the wind.
Gybing
The stern passes through the wind.
The mainsail can remain powered through much more of the manoeuvre.
The boom may cross much more quickly.
You are normally changing direction while sailing away from the wind.
Both manoeuvres change the side from which the wind reaches the boat.
But they feel quite different.
What Beginners Usually Get Wrong
Several mistakes appear repeatedly.
Turning Too Quickly
A sudden large tiller movement can destabilise the boat and make everything happen at once.
Use a deliberate, controlled turn.
Forgetting the Mainsheet
Letting the boom travel freely from one extreme to the other can make the gybe unnecessarily violent.
Learn the correct mainsheet-control technique for your boat.
Forgetting to Duck
There is no clever technical solution to this one.
The boom is crossing the boat.
Your head should not be in its way.
Watching the Boom and Nothing Else
Yes, watch the boom.
But also know:
where the boat is going;
where other boats are;
what the tiller is doing;
and how the boat is balanced.
Leaving the Tiller Over
The boom crosses successfully.
Everyone celebrates.
Meanwhile the boat is still turning.
Straighten the rudder.
Moving Too Abruptly
Throwing your body from one side to the other can upset the boat just as much as poor steering.
Smooth movement helps produce a smooth gybe.
A Useful Club Exercise
This is another reason I am such a supporter of learning through a sailing club rather than trying to learn everything from books or videos.
Find an experienced sailor and spend fifteen or twenty minutes doing nothing except gybes.
Choose a suitable open area in manageable conditions.
Gybe.
Settle the boat.
Gybe again.
Ask your experienced crew or helm:
“Was that turn too fast?”
“When should I have pulled the mainsheet in?”
“Why did the boat heel there?”
“Why was that one smoother?”
Immediate feedback is enormously valuable.
Sometimes a tiny change transforms the manoeuvre.
A slightly smaller tiller movement.
Moving across half a second earlier.
Controlling the sheet more positively.
Straightening the rudder sooner.
Suddenly the whole thing works.
From “Watch Out!” to “That Was Nice”
There is a wonderful moment when learning to sail when a manoeuvre that once seemed complicated suddenly becomes ordinary.
Your first tack feels confusing.
Then you tack without really thinking about it.
Your first gybe feels dramatic.
Then one day you turn the boat, control the sail, duck, change sides, straighten up and sail away.
Nobody shouts.
Nothing bangs.
Nobody falls over.
The boat barely slows.
And somebody says:
“Nice gybe.”
That quiet little compliment tells you something important.
You are no longer simply sitting in a sailing boat.
You are beginning to sail it.
Final Thought
Gybing deserves respect because the mainsail and boom can move with considerable force.
But that does not mean it should become one of those sailing manoeuvres surrounded by mystery and fear.
The key is anticipation.
Know where the wind is.
Know where the boom is.
Prepare the crew.
Control the mainsheet.
Turn smoothly.
Move deliberately.
Straighten the rudder.
Trim the sail.
And above all:
Expect the boom to cross before it does.
A controlled gybe can be smooth, fast and surprisingly elegant.
An uncontrolled gybe can certainly be exciting.
And, as many sailors eventually discover, the difference between the two really can be about half a second.
My name is Philip. I started sailing when I was 65.
I joined a club and because my son had already been part of a club for many years - borrowing all types of boat. He knew what we needed and the type of boat I would require.
So we did by an RS Toura - a virtually unsinkable dinghy which has given me the confidence to experiment and learn and take my RYA exams and become a competent sailor and then to move up to the boat of my dreams - the A-Rater.
Coming Next
Lesson 13: Sailing Upwind.
Sometimes the fastest way to your destination is to sail away from it.
A sailing boat can't sail directly into the wind, so getting upwind means close-hauled sailing, tacking, watching wind shifts — and learning that pointing higher isn't always faster.
Return to https://pmrsailing.uk/Lessons.html
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