boatbuildlog

Design

Koalen 18

Designed by François Vivier

Koalen 18 is a small traditional gaffer, 5.64 m long and 2.22 m wide, inspired by the fishing boats of northern Brittany with their plumb stem and moderately raked transom. She is an enlarged version of the Koalen 17 and is mainly a dayboat with a cuddy in which two people can spend a few nights.

The hull is planked over a crisscrossed plywood structure: a developed panel for the bottom and two layers of 4 mm plywood laid over stringers for the sides. The ballast is cast inside the plywood backbone, so there is no centerboard case in the cabin. She is offered as a gaff cutter or a gaff sloop, with an outboard in a well aft. The designer states that she can only be built from a CNC-cut plywood kit.

What building a Koalen 18 actually takes

Medians from the build logs kept on this site, not the designer’s estimate. Nobody has logged this boat here yet, so they are empty until the first builder does.

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Same type, closest in length.

Design Plans from LOA Logs
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Kernic Vivier Boats 5.7 m (18′ 8″) 0
Stir-Ven 19 Vivier Boats 5.7 m (18′ 8″) 0
Youkou-Lili Vivier Boats 5.7 m (18′ 8″) 0