Single fin at the narrow end. Twinzer on the fatter end. Slight chine pinched rails. 2" rocker.
Any obvious mistakes or missed opportunities?
I’m no expert so take this with a grain of salt, but that looks like an awfully flat rocker to me.
I have never made a surfboard with fin boxes at both ends, nor even seen one in person, so I have nothing else to add. Will be interested to see a progressive build thread on this, complete with ride report. Curious to know if it can really work!
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I made one of these, it’s 8’ and I use it often, but mostly as a single fin. The single fin side has double concaves in the last 18" and twin side is flat. I basically made a board with 2 tails, and they have about 2 to 2.5 inches of rocker. The twin side has a tiny bit more than the single. Hard edge tucked under rails on the whole board.
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Nice shape 
Would you go with those rocker numbers again Sharkcountry? And would you go a bit further from the tail with the twin fin placements next time?
The rockers are OK for a tail, but low for a nose. I think 2.5" is fine, but I have other boards with very little rocker, one is only 2" in the nose, and 1.5" in the tail.
I usually only use this board on smaller days where I don’t have to worry about steep drops. It paddles well with the low rocker, but I have to take off at an angle if the wave is steep. I think this concept works much better for shorter boards.
I think I would pull the twin side in a bit more, make it closer to the shape of the single side, but just have the wide point offset. I found the twin side very loose, but I used normal single fins about 7", not twins or keels. I use a 9" GG 4A in the single fin side.
I like the way the board glides when I stand about a foot from the nose trimming along on smaller waves.
I might turn a 7’ 6" board I have with 3" rocker nose and tail into one of these by adding some filler on the nose rails to change the soft edge to a hard edge. It’s already a 2 + 1, so I would make the nose side a single fin.
A friend sent me this clip of me riding the board.
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