Square Sterns. For Added Power. Designed for outboard power, all square stern canoes feature a transom gusset of tough .125” aluminum, motor pads to secure outboards and ribs for added stiffness. All except the G-1650CS have spray rails to keep you dry. Stability is a top priority for the Grumman square stern, available in 16, 17 and 19-foot lengths. The first choice of many professional guides and outfitters, the Grumman 19-footer has 12 ribs and a “Bulb T” keel for extra strength. It’s designed to carry up to 1100 lbs. and rated for up to 5 horsepower. Paddle hard!