Reefing – reducing the amount of sail you have up – is one of the most important skills in sailing, and one of the most reassuring. When the wind builds, a smaller sail area keeps the boat balanced, comfortable and safe, instead of over-powered and heeling wildly. Far from being a sign of caution, reefing at the right moment is the mark of a good sailor. Here's what it means, when to do it, and how it works.
What is reefing?
Reefing means making the sails smaller so the boat has less power in strong wind. You can reef the mainsail (usually in set stages called the first, second and third reef) and reduce the headsail (by rolling away part of a furling genoa). Less sail area means the boat heels less, steers more easily and stays comfortable – without necessarily sailing any slower once the wind is up.
When should you reef?
There's a golden rule every sailor learns: "the moment you first think about reefing, it's already time to reef." It's far easier to reduce sail early, before the wind really builds, than to wrestle with it later. Tell-tale signs include the boat heeling too far, the helm feeling heavy and pulling to one side (weather helm), spray coming aboard, or the crew feeling uneasy. As a rough guide, many cruising yachts take a first reef around force 5 and a second around force 6.
How to reef the mainsail
- Turn onto a comfortable point of sail and ease the mainsheet to take pressure off the sail.
- Lower the halyard to bring the mainsail part-way down.
- Hook the reef cringle (the reinforced eye at the front of the sail) over the boom hook, or pull on the reefing line.
- Tension the reefing line at the back of the sail to pull the new foot tight along the boom.
- Re-hoist the halyard firmly, tidy the loose sail, and trim as normal.
Modern boats often have systems that make this quick and safe from the cockpit. A furling headsail is even simpler – you just roll away as much as you like.
Reefing is best learned by feel, on the water. Practise it with an expert on a skipper training week.
Do beginners need to worry about reefing?
Not on a shared trip – the skipper decides when to reef and shows you how, so you can learn without pressure. Reading the wind is part of the craft; our sailing wiki covers the basics that go with it.
Frequently asked questions
When should you reef a sail?
As soon as you first think about it. Early signs are excess heeling, heavy weather helm and spray coming aboard – often around force 5 for a first reef on a cruising yacht.
Does reefing slow the boat down?
Rarely, once the wind is strong. A reefed boat sails more upright and efficiently, so it's often just as fast – and far more comfortable and controllable.
What is weather helm?
When an over-pressed boat pulls strongly towards the wind, making the helm heavy. It's a classic sign that it's time to reef.
Conclusion
Reefing keeps sailing safe, balanced and enjoyable when the wind pipes up – and reefing early is always the smart move. Want to learn the feel of it? Join a skipper training week.
