George Greenough invented the “Greenough Edge” concept to increase speed and turning for larger boards. The Edge design works very well on SUPs and I’ve been adapting and improving it for this purpose.
I’ve now reached the point where it significantly improves surfing performance from a SUP. This unique edge design increases speed on the wave, makes the board easier to turn, and improves carving on rail. I’m more stoked to surf every day on my Edge SUP.
The Edge SUP is designed to surf all wave types, and excels in waist to head high beach break, points and reefs. On beach break, the edge design adds speed to make sections and provides fast-twitch response when a good section appears. On points and reefs, the rail carving ability excels and enables roundhouse cutbacks down the line — all day long.
Interestingly, the edge design also helps generate speed on small days. Less wetted surface area and reduced drag maximizes speed potential from weak waves. On small days, or high tide mushy waves, this board rips harder than anything. The Edge also extends the size range for big waves, because again, reduced drag increases speed when it’s needed the most.
The Edge SUP uses a balanced outline with foam in just the right places. The Greenough Edge ends just by the front fins. A step rail on the deck at just the right spot creates a shortboard rail that sinks easily for smooth rail turns. Single concave through the center of the board to double concave with vee just before the fin cluster. These elements synergize to produce a magic board with unlimited speed that turns as if it’s three inches narrower.
Typical size range goes from 7’6 x 28″ to 9’0 x 30″, and don’t be afraid of a little extra width.
The Edge can be applied on any of my SUP designs, and on surfboards too. Quad fins highly recommended.
Thanks to Kevin Whilden from Sustainable Surf, who helped develop this design.
Check out the gallery below for more images.
This board is Kevin’s personal board. It’s 8’6 x 29.5″ x 4.5″ at 122 liters. It uses a Ballistek deck and vacuum bagged carbon bottom. It weighs 14 lbs, including the pad.
In the shaping bay, showing off the step deck and Edge lines.