Heeling for profit ???
Are most sailboats really designed to be more efficient when heeled a bit, as Jim argues? I have often heard that said but always find it odd that architects that care about speed would not design hull shape to be most speed efficient when it really counts, i.e. when there is very little wind (and consequently, little or no heel). Furthermore, if this were true, why would there not be an optimum degree of heel specified for a given hull shape and would racers try to use their ballast to maintain that angle of heel rather than to keep the boat flat? This does not preclude that some boats may, in fact, become more efficient when heeled. After all, nautical architects are only human too and all sailboat designs are compromises of one sort or another.Richard's first question (stresses) has been answered by several responders. I like Jim's image of the pressure on the sails picking up the weight of the keel. In other words, the vessel is being balanced over an imaginary fulcrum. Now imagine a big wave coming along and suddenly lifting that fulcrum! Isn't that how one would try to break a tall object over one's knee? So, yes, the design should be able to withstand the forces of the wind. However, what happens in heavy seas is a different issue altogether. IMHO, the answers to Richard's second question do not emphasize strongly enough that the first line of defense is to flatten the sails and introduce more twist. If properly done (i.e. by stretching both luff and foot, opening the leech and increasing mast bend when possible) the effect on fairly new, well-designed sails can be dramatic.Both heading up (i.e. pointing the vessel closer to the wind) or letting the traveler or mainsheet out (i.e. only pointing the boom closer to the wind) are appropriate temporary reactions to gusts as they both reoptimize the angle of attack to the apparent wind angle during the gust (or might perhaps even overcorrect in order to depower the sail a bit by "pinching"). I tend to agree with John that it is easier to head up, and perhaps even "pinch", rather than to drop the traveler. After all, the helmsperson (or the windvane)is already on station. Moreover, dropping the traveler does not yet correct the angle of attack for the genoa or staysail. However, to keep sailing around with a less than optimum angle of attack for a long time (rather than to reef) in order to depower the sails is to ask for a poorly balanced vessel. Those of us with windvane steering soon learn to avoid that.Finally, it pays to be aware of the effects of excessive heel on: (1) effective displacement (the wind vectors pressing the sails down may well add hundreds of pounds to the effective displacement of the vessel; sort of inviting a couple of heavy passengers along for the ride); (2) keel efficiency (unless you do have a canting keel you will start to lose pointing ability by sideslipping, whereas loss of valuable "keel lift" will further reduce speed); and(3) rudder efficiency (larger rudder angles will be needed, thereby increasing drag; moreover, some rudder designs will become less well balanced, thereby overpowering the helmsperson or the windvane).Can heeling be fun? Of course it can !!! Therein, however, lies pretty much its sole profit....Flying Dutchman