Join Date: Jul 2006
Location: Herring Bay, Maryland
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Someone mentioned wing lift. I've taken a good look at the profile of our Ericson 34 wing in between bottom coats over the winter. In this case they have the wing edges swept more forward than aft. Also when I view the profile from the side, the fatter portion is definitely on the bottom of the wing which would produce a negative lift. That in turn would be useful when heeled since it then has a lateral windward component. I can say that she does point very well. On the other hand, when she's going down wind, you've got the extra wetted surface of the wing doing nothing for you but producing drag. Also, the negative lift is still built in, so the extra wetted surface is producing useless lift force which is directly downward (lift downward ?, ok stay with me on this). The production of the negative lift costs some drag in addition to the wetted surface drag, without a purpose downwind.
At least from the looks of things they had the right idea to make it a functional wing in the upwind configuration. Who knows how well they pulled it all off.
Although she points well, I've noticed in light air combined with hobby horsing from power boat wakes that we stall easier upwind than the Ericson 32 did with a fin. I suppose that's from wagging that wing up and down in the water causes a lot of drag. To cmpound the problem when the wing slows down it produces less lift so now you don't point as well when hobby horsing. In heavy air it doesn't happen going upwind regardless of the waves I've seen up to four foot on the Chesapeake.
As I said before, if I was a racer I'd have the fin. But for gunkholing the wing suits my purposes as long as I tailor my gunkholing navigation to respect when the wing is more of a problem. Though not my first winged boat, this is my second year on this one and I am still learning the sailing envelope parameters.
Last edited by captnnero; 08-18-2006 at 07:33 PM.