How do you safely and quickly reef a mainsail?
I sail a 2008 Bavaria 37 with a standard slab-reefing mainsail, and I always seem to end up in a flap when the wind builds. The sail shape looks terrible once reefed, and the boom drops too low. What is the exact step-by-step process to get a flat, tight reef quickly?
Answer
To reef a mainsail effectively, ease the halyard to lower the luff, secure the tack cringle at the gooseneck, and haul the reefing pennant drum-tight to flatten the new foot. Finally, re-tension the halyard to restore luff tension, ensuring the sail is completely flat and depowered rather than baggy.
Control the Boom
Before dropping sail area, control the boom and depower the rig. A solid rod kicker with an internal gas strut will support the boom weight. If your boat relies on a traditional rope topping lift, haul it in just enough to take the load. Fail to do this, and the boom will crash into the cockpit the moment you ease the main halyard. Keep your head and hands clear of the swinging boom and mainsheet blocks.
Have the helmsman steer a close-hauled course. Pinch slightly into the wind to take the pressure off the mainsail. Ease the mainsheet and the kicker so the sail luffs. You want the sail cloth to soften so the batten cars slide down the mast track without binding under load. Do not let the sail flog violently.
Slab Reefing Sequence
Most cruising yachts use a traditional slab reefing system with a pair of stainless steel hooks at the gooseneck. Follow this exact sequence to secure a tight reef:
- Ease the halyard: Lower the main halyard until the reefing cringle on the luff is just below the gooseneck. Mark your halyard with a permanent marker at the clutch so you know exactly how far to drop it for Reef 1 and Reef 2.
- Secure the tack: Hook the luff cringle onto the ram's horn. If your sail has a webbing loop with a stainless friction ring, slip the ring over the horn.
- Tension the halyard: Winch the main halyard back up to full sailing tension. The luff of the sail must be absolutely tight before you pull the back end of the sail.
- Haul the reefing pennant: Pull in the reefing line for the clew using a cockpit winch. Grind it until the clew cringle is pulled tightly down against the boom and straight back towards the boom end.
The reefing pennant now acts as your outhaul. If it only pulls the sail down and not back, the sail will bag. Upgrading standard 10mm or 12mm polyester reefing lines to 8mm Dyneema reduces stretch and friction, making it much easier to winch the clew flat.