Double Diagonal Most often seen on PT boats and minesweepers and Huckins Yachts. If heavily fastened, this method very strong and long lasting. Both edges and centers of planks need to fastened to prevent warpage. If not heavily fastened, planks subject to cupping because of thinness of planks. In that case, were highly prone to deterioration and fastener failure.
Warped planks spell big trouble.
Plank on Plywood Another very effective method that is very good at keeping fasteners dry. Used mainly by Chris Craft. Very strong, long lasting. This method utilizes longitudinal hull side planking and transverse bottom planking. Vessels built mainly for fishing in protected waters of Chesapeake Bay and Carolina sounds.