How about, rather than a wing, just extending the keel about a foot? In my opinion, a wing is a bit of a gimmick. You could make an extension of wood or foam and take it to a iron foundry, and the considerable shrinkage in the iron would allow clearance to give the whole thing a heavy layer of glass (being sure to use epoxy), which would make it bulletproof. If you make the extension out of dry pine you can weigh it to estimate the weight of iron, if foam you'll have to glass it and arrive at the weight of iron by the displacement method. Remember our old friend Archimedes? Water weighs 62.4 lbs per cu ft; iron weighs 450. jerry ----- Original Message ----- From: "lon zimmerman" <zimco@gci.net> To: "'For and about Montgomery Sailboats'" <montgomery_boats@mailman.xmission.com> Sent: Thursday, April 09, 2009 11:32 AM Subject: M_Boats: M17 wing keel
AN EARLIER THREAD FOR CENTERBOARD PROBLEMS WITH THE M17, TALKED ABOUT REMOVING THE CENTERBOARD AND ADDING A WINGED KEEL.
HAS ANYONE TRIED THIS IDEA?
ALSO - ANYONE MAKE A DODGER FOR THE M17?
THANKS
Lon SELKIE
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[Dick Straubel Sat, 20 Sep 2008 08:06:11 -0700]
Would increase the draft by the thickness of the metal plate. When heeled, the wing might go down deeper as it tilts, but not significant and would not increase draft more than the thickness of the plate when not heeled. The plate could actually be quite thin, and weight or original board could be replaced by pouring a lead/resin gruel down into the trunk from above. The trick would be to design the rake of the wing blades and determine the position of the wing
plate fore and aft on the keel to achieve the best helm balance. I believe the point of raking/sweeping the wings is to adjust the center of lateral resistance aft as the boat heels so the helms stays close to balanced
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