It's a triple stringer with the outside two stringers bent outward toward the rail and the center stringer straight. The theory is they resist torsional stress... but really they just look cool.
It's all about the quality of craftsmanship, and the ability to deliver exactly what the customer wants. It takes significantly more time to do a board like that than to do something that's going to be sold off the rack. And if you F it up, guess what... you just eat your mistake, start over, and end up making no money at all.
The most expensive board I ever purchased also turned out to be a complete dog even though it was a total work of art. It held its value though when I resold it.
Never heard that before, I've always known them as parabolic stringers. Interesting. Some people swear by them, but some people swear by the BLEF fin and square-nosed Tomo's. If a new design really works, it'll eventually find a permanent place in the lineup. Fads are just a passing fancy. But you'll never find out what really works or not if you never experiment. Ride everything.
Tell us more about this board. Unless you think the shaper is one of the 4 guys remaining on this site and you might hurt his feelings. We don't want that.
I like the guy who made the board so I won't trash him. His boards are very desirable but the one I had was a complete dog.
Parabolic stringers generally curve inward, following the rail line, either just in from the rail, or actually making up the rail. Butterfly stringers curve outward, away from the center stringer at the nose and sometimes the tail, too.
i'd be lying if i told you when that stimulus check hit, i wasn't looking at the costlier vintage boards. I think they can be downright sexy, but i wouldn't put a grand on it, maybe half of dat