dorienc wrote:
I hook my mainsheet on the FORWARD hole for strong winds, to flatten the sail. Hooking it aft gives you a larger draft for low wind conditions.
I thought that also. But when I look at the mainsail using each setting, I notice that a LOT of twist exists in the sail towards the head when the hook is in the forward position and not nearly as much when placed in the aft position. I too always heard that a flatter sail reduced the "power" of the sail. But, I believed it to mean that you wanted less "bag" between the luff and leach, accomplished by tuning the outhaul, downhaul, and boom vang. Changing the clew hook position doesn't change that much if any... at least on my boat it doesn't. Mine is an 04 with an original main so wear could be a factor. I had the opportunity to experiment last week with this very issue and I concluded that when beating upwind and sheeted in nearly block to block, having the hook in the aft position definitely applied more side load for heeling even if I didn't have a way to gauge speed increase/decrease. It sure seemed faster though but that was probably due to the hull rising out of the water. With that said, I still haven't heard a definite answer as to what those positions were designed to address.