Full batten mainsail on H36
Joe -On an H36 the "standard" mainsail is 426 sq-ft, while the in-mast furlable mainsail is only 384sq-ft.In any given windspeed, that translates into a 10% reduction in propulsive force. Since the B&R rig is designed to make possible a large roach, that also meant to me accepting its downwind sailing limitations without getting the benefit that justifies them.However, the "standard" UK mainsail came with only 2 full battens and 2 leach battens. So, when I ordered Persephone I had Doyle make a set of sails for me out of 8.8oz type 52 dacron designed for sailing in conditions between 3 and 35 kts. The all-full-batten mainsail is 490sq-ft (15% larger than the "standard" mainsail, and 25% larger than the in-mast furlable), In winds under 10kts Persephione walks away from most of the boats around here, especially H356s, 380s and 386s with roller-furling mainsails. (Early last week, in 6-8kts, the big fast catamaran "Ninth Wave" that was taking tourists out to the Isles of Shoals fell further and further behind, when I was doing 6 kts on a beam reach. Having informally jousted with them before, I don't think they were happy <g>. However, in 10-15kts, I have to struggle to keep up, and often lose to them.)Unless your area consistenly has winds over 10-12kts, you'll find the extra area of the full roach lets you sail when many are motoring.Of course, to get the wind range I wanted, I had to have 3 reef points and the accompanying extra lines led aft, but I have sailed over 3,000nm with it in all conditions between 3 and 30kts (and involuntarily in some higher speeds).(The Gulf of Maine typically has Force 2-3 SW'lies in July and August. This time of year we typically have Force 4-6 W'lies and NW'lies - though it's been Force 8-10 this past weekend.)There's no question that a furling mainsail is more convenient, but with all-full-battens the lazy-jacks work like a charm.I admit to being a bit of a singlehanding seaworthiness freak, and have made many mods to Persephine, accordingly. However, I've had to go forward tethered to a jackline in order to un-jam a partially furled jib in Force 6 conditions which taxed the autopilot. That was a consequence of my not installing my foremost fairlead exactly perpendicular to the winding axis of the drum this Spring, and has since been corrected. However, I shudder to think about dealing with a jammed mainsail inside that inaccessible mast cavity.I understand that the necessarily loose luff with a boom-furling mainsail gives up a little sail shape, but only enough of a performance hit for out-and-out racers to think significant. The fact that its failure mode is to drop like a standard mainsail I find very attractive. However, it wasn't an option for me and I realize that the technology is not yet as proven as headsail roller-furlers (or in-mast furlers).Since the purpose of battens is to maintain a transverse wing curve, I've never understood why putting them in a sail lengthwise (along the wing) would be of any benefit - breathless marketing talk notwithstanding. (I also wonder about the effect they may have on one's ability to put a lot of twist in the sail to spill higher winds, but I prefer to reef-down to a smaller and better sailshape, anyway.)Like every other choice in boat design and fitting-out, it greatly depends on the conditions in which you sail, and the priorities you personally give to performance, convenience, safety margin, cost, etc., etc.Fair winds.Al