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Lap Clamp Plan


Product Description

Just redrawn, our new lap clamp plan includes the 4", 7", 9", 10", and 12" clamps, and shows you how the handles are made as well. Everything is drawn full size on a single page measuring 24" x 36".

Lap clamps are used to pinch plank laps together so that no drilling dust will enter the laps when you drill for fastenings. They also help determine the placement of fastenings. In the shot below, taken when Matinicus Double Ender Freedom II was being built, the lap clamps are positioned where her steamed ribs will go. Since the fastening scheme requires a pair of fastenings between every pair of ribs, with the clamps in place it's easy enough to divide up the space between them and place rivets accordingly. New builders seem to be of the impression that fastening spacing is fixed–it's not, and the reason it's not is because measured along the plank, the distance is greater at the sheer than it is down low. If they were to use 3" spacing along the lowest lap, it might look fine there, but would look downright silly along the top lap. Worse, the strains would not be distributed evenly, and that becomes a structural concern.


In any case, with this plan, you will be able to make your own lap clamps to whatever size you require. This plan is folded and shipped flat to save shipping costs, though if it is ordered with another plan or lofting, it would be shipped rolled together with them.

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  1. Makes lapstraking possible

    Posted by Steve Lewis on Aug 8th 2020

    Includes instructions for making nuts

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