Make a profile from the inside of the dagger board well. Then I'd start with:
http://www.fibreglast.com/product/Polyisocyanurate_Foam_Sheets_440/Foam for shape. You could bump up to 6 lb foam but I don't think you need the extra strength or cost. Using polyester or vinylester resin, bond a layer of fiberglass matte to get good bond to the foam. Then a couple layers of Kevlar cloth for strength. Finally, add a layer of fiberglass matte for smoothness. Fill any pits with a premium putty. Sand with 220 then wash thoroughly. Repeat the putty, sanding and washing until all imperfections are gone. This will take several tries. Finish with gelcoat sanding with 320, 600, 800 then polish with AquaBuff 2000. If you want to paint instead, prime with a high build primer, sand with 320 then 600 then spray with paint. Remember, Kevlar is more difficult to work with and to sand if you build it up too high. that's why I recommend fiberglass matte on top of it. Lastly, polyester or vinylester resin is cheaper than epoxy. I'd consider making one from marine plywood first and varnishing it. If you like it, you can use it to make a mold for the composite one. Dennis C. On Wed, Mar 11, 2015 at 11:02 AM, Brent Driedger via CnC-List < cnc-list@cnc-list.com> wrote: > Good day folks. > Last year I was gifted a tired Bombardier Invitation 3.8. With a little > TLC I'll get her sailing agains but the boat came without a daggerboard. > I'm going to make a composite one. Two questions. I've scoured the Internet > for a design detail of the board but have come up with nothing. Does anyone > have any links they know of or information that could be helpful? Second, > for the composite masters, what would be the best core choice and layup for > this project? Will fibreglass be fine or should I go with Kevlar? > Thanks. > > Brent Driedger > 27-5 > Lake Winnipeg. > > Sent from my iPhone > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
_______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
