This is about the only area of surfboard design in which I feel I have some credibility, if only by personal experience.
I think rocker is abused, even to this day.
Most people will agree that the nineties saw too much rocker in the shortboards (and even the longboards), but nobody is really making that big of an improvement on that mistake. They are just taking out that once-popular nose flip.
I am of the opinion that less rocker can be beneficial in steep waves, as well as mushy surf. Why? Because you get in earlier. I have an 8,2 that Jim Phillips shaped for me that was made from and 8,3E blank. I had them take off two inches of nose rocker, from center, leaving the nose rocker at 3.5 inches. That’s pretty low, and I had doubts. My doubts were confirmed by a couple other shapers I asked who said, “ooh, too much taken off.” In fact, that blank had never had that much rocker taken off (according to Clark’s sheets) and so I figured I blew it.
Phillips shaped it into the best board I ever owned. I don’t ride it often, and it isn’t my favorite board to ride (because I prefer shortboarding most of the time), but it is definitely my best board as far as shape is concerned. It gets in so early it’s disgusting. It is only 8,2, remember, and not especially wide or thick, but it keeps up with the ten foot tankers at San Onofre. And the real kicker is that it keeps AHEAD of the shortboards at Blacks. The board gets into hollow waves so early. Everyone I meet asks about it, and I try to get as many people to ride it as possible. It is incredibly fast.
The funny thing is, that nobody trusts me when I tell them how little rocker is needed. They want to copy the board, and I tell them to get an 8,3E and take two inches off the nose rocker from center, but they never do. They just can’t bring themselves to do it (usually because their shaper talked them out of it), and so they don’t get the same board. Of course, it helps to go to the right shaper.
My favorite shortboard has very little rocker throughout, and to make up for it, the board has a very curvy outline. It turns just as easily as those skinny things with the flipped noses, but carries through the flat spots.
My favorite shortboard, although I am going to get heat for admitting this, is a Rusty Pirannah (6,10). Because of the design, it is as fast and loose as boards six inches shorter. I have never surfed as well on a shortboard in my life as that board. I bought it on a whim (first off the rack board in twenty years) and don’t regret it.
I don’t always agree with Rusty’s thinking about the business end of things, but shaping? Got to give the guy his due. He rips.
Rocker? We can all do with less. Because less is more.