When to reef
1The lesson in plain words
Reefing makes the sails smaller. Reef early: before the wind arrives, before dark, and while it is still easy.
What reefing does
Reefing reduces sail area and heeling force. Lowering a slab-reefed mainsail also lowers its centre of effort, where its wind force acts. You sail more upright, with less leeway, or sideways drift, and a lighter helm. If you are overpowered, reefing often maintains or improves speed by reducing heel and rudder drag. Reefing also lowers the loads on the sails, rig and crew.
The signs
On a cruising monohull (one hull), regular heel beyond its comfortable angle, often about 20–25°, is a reefing warning. So is heavy weather helm, when you need strong rudder correction to stop the boat turning into the wind. Other signs are difficulty holding course in gusts or constantly easing the mainsheet, the line controlling the mainsail. Learn your yacht's limits and follow its sail-reduction guidance. On a multihull (two or more hulls), do not wait for substantial heel before reducing sail.
Plan ahead
Reef for the strongest wind you expect, not the wind you have. Look at the forecast gusts, not just the average wind. Reef before turning upwind, before nightfall, before a squall reaches you and before you enter a narrow harbour. Reefing is easier and safer in moderate conditions. A saying: "If you think about reefing, it is time to reef."
Which sail first
Reefing the mainsail usually eases weather helm. Reducing the headsail, the sail ahead of the mast, can make that helm heavier. With a large genoa, a headsail extending aft of the mast, you may reduce it first, then reef the main if steering stays heavy. A fractional rig has its forestay, the forward mast-support wire, attached below the masthead. If it has a large main, you usually reef that first. Add sail again only when the wind has clearly eased.
Safety
Wear a lifejacket and a properly fitted safety harness, separate or integrated. A tether is the safety line joining your harness to a jackstay, a strong line or webbing running along the deck. Clip to a suitable jackstay. Use an inboard attachment route and keep your tether short enough to prevent going over the side. Keep the boat as steady as you can while handling lines or working at the mast.
2Key data
- Reef signal (cruising monohull)
- Regular heel past about 20–25°, heavy weather helm
- Plan for
- The forecast gusts, not the average wind
- Reef before
- Turning upwind, dark, squalls, narrow entrances
- On deck
- Lifejacket, harness and short tether to an inboard jackstay
3Key points
- 1
Reefing reduces sail area and heeling force; an overpowered boat often goes as fast or faster.
- 2
Reef when heel is regularly excessive or weather helm becomes heavy.
- 3
Reef for the gusts you expect, and before dark, squalls or turning upwind.
- 4
Reduce sail until steering is light and the boat feels balanced.
- 5
Wear a lifejacket and harness; clip on with a tether short enough to prevent going over the side.
4Frequent mistakes
Wrong: Wait and see if the wind really increases before reefing.
Right: Reefing in rising wind and sea is harder and riskier. Reef early; shaking a reef out is easy.
Wrong: Reefing always makes you slower.
Right: An overpowered boat heels, slips sideways and brakes with the rudder. Reefed, she is often faster.
5Practice case & exam keys
The forecast is 14 knots gusting 24 this afternoon. You leave at noon in 12 knots with full sail for a 6-hour passage, mostly upwind, arriving at dusk.
Show the answer
Choose reef depth for your yacht and the forecast 24-knot gusts. Set it before departure or before turning upwind, while conditions are manageable. Reduce the headsail as needed to keep steering balanced. Brief the crew and use lifejackets, harnesses and short tethers on suitable inboard jackstays.
Exam keys
- Reefing reduces sail area, heeling force and loads.
- Signs: regular excessive heel and heavy weather helm.
- Reef early: for the gusts, before dark, before turning upwind.
- Lifejacket, harness and short tether to a suitable inboard jackstay on deck.
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