Our general work boat plans for the 21-inch hull features detailed work boat design plans of the g21 boat series. get wooden boat plans free at bateau!. Learn how to build yourself a boat in your backyard. our complete boat plans collection is available for free and immediate download. it is the largest wood boat. How fast does it go? for estimating the speed for small outboard planing boats see planing speed boat chart. this chart should be used for.