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Searunner 31 Centerboard
Photos from replacing the centerboard on Pineapple Express, my Searunner 31 trimaran.
John Prentice of Westport was the real brains of this operation. Built most of the board and taught me how to do the next one in his shop.
The new board built (mostly) to plans went in smoothly with the boat in the water and less than 1 gallon of water in the bilge.
The tiller box and quadrant on the SR31 are under the cockpit, on top of the centerboard trunk. I replaced the face of the box (with Coosa and...
Here's the centerboard pin receiver for minimizing the amount of water that goes in the bilge when changing the centerboard pin with the boat afloat....
Here's the new board with initial 2 coats of cloth and epoxy - before cover coats and painting. Note the lack of split-hose padding (no room in the...
New board made by John Prentice of Westport. 3x 3/8" marine grade plywood, laminated with System 3 silver tip, then shaped close to the NACA foil in...
In the end we had to cut the old board out in about 8 pieces.  We drilled into the bottom with a 1" drill to allow it to compress, then whacked down...
Tried to push the swollen board out through the bottom, but it jammed tight. Note the absence of the recommended split-hose padding on the board.
During my last haulout I decided to try to remove and replace the centerboard, which was no longer going all the way down due to swelling from water...

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