Designing for Construction in Plywood

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  • Pub No.: 7021
/ The results of a year's research ib plywood development for boats.

There came recently to our attention an unusual comment on a build-it-yourself boat design which has prompted the writer to give here the results of a year’s sporadic research in plywood development for boats.

The statement in question was to the effect that the bottom lines of a certain boat had not been altered except to adapt it to plywood construction; that is, apparently concave lines of cross section were straightened out from keel to chine and from chine to sheer. We have examined dozens of V-bottom designs for plywood adaptation and have seen but one in which the designer did not labor under the delusion that straight sections would accommodate a plywood bottom without strain. As a matter of fact, there is only one time when such a condition can exist and that is when section lines are parallel, or generating lines of a cylindric surface at right angles to the center plane of the boat. In such a case a deep-bottomed sail boat with easy lines may be developed which will be more or less orthodox, but this is an exception. Although we labored under the straight line section delusion for awhile, we soon disproved it, as you may do, by carving a half model of a stock V-bottomed runabout with the sections straightened out and then attempting to cover it with a plane surface (cardboard). When the carboard was forced to meet all points on chine and keel, it buckled badly; and even on the sides there was sufficient distortion to demonstrate that only a convex section of some nature would meet the conditions necessary for plywood covering. To determine the proper form for the accommodation of plywood covering we turned to the drawing board, and thus was evolved the design for Conendric.

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