Reef the Main
If you are heeling consistently over 20 degrees, the boat will actually go faster if you reef and get her back "on her feet." That is in the 15 to 20 degree range.The first thing, though is to flatten the main for heavy weather. That means:- Tighten the outhaul to move the clew of the main back and reduce the belly in the lower third of the sail.- Tighten the main halyard to flatten the luff. Hauling down on the Cunningham adds to this effect if you have one.- Keep the mainsheet tight to flatten the upper part of the main, and the leach. Move the traveler to leeward until the tell-tales at the back of the main are streaming straight back.- If you don't have a traveler, or if the boom needs to be beyond the end of the traveler, tighten your boom vang as much as possible. This holds the boom down when you ease the mainsheet. Invest in a vang if you don't have one. This is a low cost and very effective sail control.If you have optimized the tuning of the main, and you are still heeling over 20 degrees, it's time to reef the main. In addition to giving you a good balance of sail to the wind, and reducing the drag and leeway that come with excessive heel, reefing will also reduce weather helm. You will need much less rudder to keep the boat on course, reducing drag from the rudder, which does slow you down, and increase heeling!If you can't get the main "flat" with the controls suggested, it may be "blown out." That means it has lost its shape, and will always provide too much heel, and too little drive. The easiest way to tell what shape your main has is to lie down under the boom and look up at the boom and mainsail. Where is the deepest point of the belly of the sail? If it's 40 percent back from the luff, the sail is probaly in good shape. If it's 50 percent or more back from the luff, it needs to be fixed or replaced. A local sailmaker should be glad to come out, and have a look at your main at no charge, and discuss options with you. Our 23 year old main was blown out when we got our '77 h27. A new main added 1.5 knots to our speed in a 12 knot breeze, and reduced heel by 5 percent!I focused on your main, because a 100, or 110 jib (110 means that the clew overlaps the mast by 10 percent) is the best sail for 18 knot winds. If you get the main right (flattened, then reefed) the jib will probably be fine - reefing/furling it is the next action if needed. But that will probably come in higher winds.DavidLady Lillie