Darker tan gelcoat, red striping. The center section of the hull is much larger forward than the sponsons and provides a fine, deep-vee entry, producing an nice ride in chop and waves. At the stern, the 15 hull has a somewhat unique transom, lowered to create depth, offset slightly to the rear to add length, and raked a few degrees from vertical. The contour of the bottom is a central rounded vee, several inches deeper than the sponsons that flank it on either side. There is not a large flat bottom area aft, which makes the hull a little harder to plane.
All models have a trapezoidal bow locker with drain and a stern motor well with scuppers.
All models also had a rear bilge sump with drain. A diagram showing the embedded wood denotes all the variations. The center console had a tunnel molded in the cockpit floor from the drain sump to the console. The 15-foot hull had a long run, from 1976 to 1994, and bare hulls may still be available from Boston Whaler Commerical Products Division, although the cost may be somewhat higher than when offered in the recreational line. The Whaler 15 carries its weigh better than I do.