12 Foot Catboat

12 Foot Catboat
Designed by Edson Schock - Circa 1940's

Follow me as I build a 12 foot catboat from plywood and pine. The boat was designed by Edson Schock in the 1940's. This is a project born of a desire to have another boat to sail here in Puerto Rico that will stand-up to the Trade winds. The sail plan will be changed to a gaff rigged sail. All the lumber is locally bought and pine will be substituted for oak, which is not readily available here. Marine plywood will be used.

Thursday, April 30, 2009

Last Layout Drawing

I interrupted the making of the gussets (frame corner pieces) to make a drawing of the view of the keel, sheer (outside deck) line and the chine (where the bottom of the side panel meets the bottom panel).

I first drew a line, 2 inches inside parallel to the edge of the paper. This becomes the centerline of the boat. I then marked out the position of each frame along the centerline. Taking my carpenter's square, I then extended a line out from center representing the frame.

Once all the frame had been drawn, I marked the position on each frame where the keel, chine and deck positions crossed it. I then took the long wood strip and drew a line to show where each crossed the frame.



Chine line.



Deck line. Note the chine line just inside the deck line.

There is not a lot of distance between the deck and chine line because the sides of the boat are nearly vertical, or "hard chined". It would be "softer chined" if the sides extended out at more of an angle. A hard chined boat is "stiffer" and will not heel over as far.

I will use this drawing to obtain the angles to cut into the corner and top of each frame for the long pieces of 3/4" x 1-1/2" "stringers" (long pieces of wood) that will run from the transom (back) to the bow (front) of the boat.

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