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The 13 foot hull produced by Fisher-Pierce, at Braintree, MA and Rockland, MA had sprue holes for the manual pouring of foam in liquid form into the hull. The 13 hull was filled with a 5 gallon bucket. The early manufactured 13 hull did not have a sprue hull, but rather a anchor locker insert that took more finish work to smooth out the edges. The chief of BW Engineering Department, Bob Doherty, changed the manufacturing process to a separate sprue hole that reduced the finishing time for the 13 hull.
The 16 hull was filled using a 10 gallon bucket; however, the 16 hull did not have a sprue hole. The anchor locker was open for foam pouring by hand, and then an anchor locker insert was installed while the foam cured.
The bleed holes for the foam (actually, they were mostly air escape holes followed by a measured amount of foam) were located at four different locations near the weld lines: one hole each on the forward gunwale area, located half way between centerline and corners; and at the stern corners where the gunwale guards were screwed into place at the transom. The holes were 3/4 inch and filled in with gelcoat patch.
A 13 foot hull could be produced in 30 minutes and the foam was allowed to cure for up to 2 hours before the boat was removed from the mold.
