Is a third reef necessary?

EVERY NOW AND THEN some cruising sailor gets caught out in a gale and comes home wondering out loud if the mainsail should have a third reef. The advice comes pouring in from all sides, and it’s usually contradictory and confusing.

Racing skippers will tell you they never reef. Well, hardly ever. But it’s different for them. They don’t care if their mainsails flog themselves to bits on the beat. They’re going to buy new sails next season anyhow. And they’ve got large muscular crews with highly developed clinging powers, so they won’t fall overboard when the boat broaches and the mast hits the water.

Some sailmakers aren’t much use, either. A contributor to one bulletin board I read recently said his sailmaker simply refused to put a third reef in the mainsail for his 26-foot full-keeler. “He said the extra sailcloth and grommets involved would screw up my main's light-air performance. I would add too much ‘stuff’ (weight, hardware, etc.) up high, where I don't want it. And would not let the leech open up properly in light air.” Well, to put it delicately, this is pure poppycock, of course. That sailmaker has been brain-washed by racing skippers.

However, I personally don’t believe a boat of average displacement under 35 feet in length is going to benefit from a third reef in storm conditions in the open ocean. Perhaps that reef might help in calm water near shore, but it’s not going to generate enough power to push a boat to windward in the big seas a storm generates.

My preference is for two oversized reefs on a boat of that size, and when things become too hectic for the second reef you have three choices: lie a-hull, heave to under a main trysail, or run off, either under a storm jib or under bare poles.

Now when it comes to bigger boats, a third reef can make sense. The difference here is that a big boat not only finds it easier to carry its way against big waves, but it also can carry comparatively more sail to drive it to windward. That’s because stability (hence the power to carry sail) increases as a cube of the boat’s length, while the force of the wind increases only as a square of its speed.

So, while a 40-footer is only 62 percent longer than a 25-footer, it can carry 410 percent more sail for the same degree of stability. That means a third reef in a 40-footer is comparatively much bigger than a third reef in a 25-footer, and is thus able to generate a comparatively greater amount of power.

I once had a third reef added to my main on a 31-foot heavy displacement sloop. I went through seven gales with that boat and never used my third reef once. I thought it would substitute for a main trysail, but by the time the third reef was down, the center of effort had moved too far forward. The heavy wind against the mast and rigging simply blew the bows off and she wouldn’t heave to. That’s what a trysail is all about. It gets sail area well aft, so the stern will blow to leeward and the boat will end up lying pointing at an angle of 60 or 70 degrees off the oncoming wind and waves. That’s the safest, most comfortable position until the boat starts to be picked up bodily and hurled down sideways.

Finally, let me repeat the three basic rules of thumb about the timing of reefing:
1. Reef before you have to.
2. When sailing downwind, reef in the same wind speed you would if you were beating. (Not easy either to judge or to do, but very necessary.)
3. When in doubt, go straight to the double reef.

Today’s Thought
The tempest’s howl, it soothes my soul,
My griefs it seems to join;
The leafless trees my fancy please,
Their fate resembles mine.
— Burns, Winter: A Dirge

Boaters’ Rules of Thumb, #152
WHEN to reef? Before you lose control. On the wind, the signs are pretty obvious: sidedecks awash, dreadful weather helm, and lack of response to the helm. Downwind, watch for prolonged surfing and a sloppy, dead feeling to the helm when a waves passes underneath the stern. Time to slow down.

Après moi, le déluge
I’M PLEASED and astonished to report that new Followers have been flocking around in hordes to compensate for the fickle Follower who left me for greener pastures (long may he rot). The Follower count is now up to a record 37. I am a happy man.

Tailpiece
“Hey, do me a favor, willya? Stick your head out the window and see if my turn signals are working.”
“Okay.”
“Well, are they working?”
“Yes — no — yes — no — yes — no —”

(Drop by every Monday, Wednesday, and Friday, for a new Mainly about Boats column.)