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Old 07-22-2009
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The switchover point between your small and large jib depends upon your boat and what works for it. We find our 155% overpowers the boat upwind when the wind gets up to around 20 knots. We start to heel too much and slow down, despite the spray making us look fast. Depending upon the circumstances, we may keep the large jib up and reef the main in order to reduce heel. Perhaps the next leg is a jib-reach; too tight for the spinnaker. Perhaps we think the wind is going to die down. In a breeze of 20 or more knots, we go with the smaller jib. In that much breeze, the large jib funnels too much air into the slot, too, and ends up backwinding the main for half it's area: not fast. We have about 8 tons of lead in the keel to keep us on our feet, however. A lighter boat or one with a different hull shape will respond differently to the conditions. You will have to try different combinations of windspeed and sails and see what works for your boat.
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