Hard to comment without knowing the rest of the parameters like width, length,thickness,outline,rocker,stuff like that. At first blush it looks like it will go straight down the line but may be a bit tough to turn. More info will get better comments.
For those kind of board, I first make the single concave, start 1 foot of nose ended near tail, max at max outline width. Then I cut double in, start at max depth of single all the way through the tail like “double barrel”.
My hunch is that if you run the deepest part of the duals closer to the rails you’ll create more of a ‘hook’ in there for better edge control(?) I usually put the deepest part of the single pretty much under or near my back foot on that sort of design. It also works good on fish-type boards.
When shaping, I boost the tail rocker a bit with the tighter arc in the rocker about where the concaves are deepest. Once you shape the concaves, it kind of straightens stuff out. Also fun to place a straight edge on the diagonal through the concaves to see where you actually get a dead flat rocker section.
Great food for thought. I’m a little nervous about a hook in the rail and catchiness. But I’m gonna have to cut one and have a look at it and maybe reshape, so I’ll bear that concept in mind. I’m keeping the first cut really subtle, with a mind to reshaping it or simply glassing it and seeing what results.
Cool advice on the tail rocker. It’s a bit wierd machine designing because the concave matches the rocker and the rails are pulled down, if you get what I mean.
