7'2 Dismetric Hull
This is the first prototype of an Asymmetrical Displacement Hull I have been thinking and working on, for some time now. And also the experiment of a more performance outline and bottom shape while still including a big part of displacement hull. It’s a totally different vision of displacement hull I’m trying to explore. That board for myself is made for regular foot surfer. The right side of the surfboard (frontside) is then having a straighter outline for more speed down the line. And a wider tail which offers more flotation on the back foot. That side of the surfboard will get a side fin to hold better the wide tail and compensate the non-deep central fin. The left side of the surfboard (backside) has a more curved outline with a narrower and rounder tail to relieve the pressure needed to engage a rail on backside surfing. The nose rocker of the board is more pronounced than a classic displacement hull, with an acceleration on the last front foot to make it easier to ride near the tight, inside curl of the wave. But the middle part of the surfboard has a flat rocker from 1 foot up to the central fin until 2 foot from the nose. That part of the rocker is exactly similar to the classic Displacement Hulls rocker I’m usually doing and will provide extra surface area to make the surfboard move faster while having more stability on that point. I made then a “twisted” tail rocker, with more kick on the left side of the surfboard (backside) to help on turns. Bottom shape has been thought to build a board which could keep the characteristics of a displacement hull but only when needed. Using the balance between front foot and back foot, as the displacement hull part (belly vee) is located on the front foot area, where the widest point is, on the middle of the length of the surfboard. The back foot area then has a full planing part with a kind of asymmetrical spiral vee, which is deeper on the left side of the surfboard (backside). The Belly vee is here to provide the main style of how the surfboard will ride, to keep that “resistance” and connection to water feeling we like so much on displacement Hulls.
And the spiral vee which is a double concave into a vee is here to help the transition from rail to rail while providing a lift with the double concave, and allow the surfboard to plane above water. The backside rail is a soft 40/60 rail (40% top, 60% bottom) so a rail upper than the frontside rail which is boxier. So two opposite components of surfboards design mixed into one, is the vision I have been trying to experiment on my displacement Hulls since a while. With most of my models but mainly with the PMH and the Parlementia Hull. It’s been pretty surprising but I wanted to explore the possibilities a bit more. Fin setup will be a single fin located more backward than a classic hull to surf mostly on the back foot. With a depth of 8” and a moderate flex. Only the frontside part with the wider tail will have a side bite. The board is 7’2 X 19” on the left side (backside part) and 20 1/4 on the frontside part. And 3 1/8 thick. Lightweight glass.
I have been testing since 3 weeks my last design based on a principle of an asymmetrical hull including also many different changes into the bottom shape, rockers, outline and fin placement. I have tried that 7'2 by 19' by 3 1/4 everyday in many different kind of waves, and that board became one of my favorite design. It never felt that easy to surf a displacement hull on back side. And the board really allow to surf a non-regular wave, compare to a classic displacement Hull which require a more regular wave providing a wall. The most surprising thing was to feel that deep spiral vee, which really lift the tail out of the water, make it planing and allowed me to push on my rear foot to get some propel.
A different kind of propel than a flex fin propel. A propel i can use after a bottom turn, or into the curl when the flex fin would have not provide me any gain of speed. While on full trim i could move a bit forward and use to whole potentiality of the belly vee located on the front foot and feel the Hull alive! That was the really interesting thing of how i could have two boards in one, and just in gauging the balance between the rear foot and front foot. The reactivity and manoeuvrability of the board is way more enfolded that a classic displacement hull, which is good for beach break’s short waves.