Drilling HDPE

hdpe-cross-sections-13View of cross section 4 after the outside stringer holes are drilled. The inwale still needs to be marked and drilled. The flat section at the top is the forward coaming location.

Concave Cutouts

hdpe-cross-sections-14To accommodate the concave nature of the skin while in the water, the cross sections are cut to that shape. Between the keel and chine, the cutout is 1/2″ to 3/4″. Between the chine and gunwale, it’s 1/2″. Place a small nail half way between the stringers, and insert small sections of 3/4″ tubing in the stringer holes. Place the 3/16 ” or 1/4″ flexible tubing as shown in the photo above, and mark the curve with a permanent marker pen. These lines will serve as a guide for cutting out the cross section.


Concave Cutouts – The cross section after all concave lines are drawn.