neat paper, bit technical
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Apr 21, 2014, 05:11 PM #1
discuss: quad v thruster quantified
Apr 21, 2014, 05:34 PM #2
- Join Date
- Jan 2009
- Hilton Head Island - OB, SD
really cool paper. I guess the end result is that for most modern surfing, a thruster would be the right call 90% of the time, while in incredibly small, maneuver less mush, a quad would give you speed, an in those VERY large situations, where it is simply down the line surfing, a 4 fin setup would be suitable.
For modern day barrel riding though, even on big waves, this paper's results indicate that a thruster is a better choice in Huge barrel surfing because it allows the ankle tweaking and maneuverability that would be so critical while making those minor adjustments in the tube. You could argue that in a wave like Teahupoo or something that maybe the quad would work, just because its all about speed and once you set your line angle at the bottom of the wave face, its all just kind of a race then...
But again, this paper re-enforces to me that there is a reason why you RARELY, if ever see quads and stuff being used on tour. I know people have dabbled in it. But on a large scale, flip everyone's boards over at any given event on the ASP and you will see thrusters and thursters only primarily.
Still trying to fall in love with my quad... Maybe some day....
Watched a video of tyler knox on a 5 fin bonzer through a link on this site last week. It looked like such an effort for him to get that tail around and go rail to rail... So, I guess more fins == more drag and harder to turn regardless of the setup.
Apr 21, 2014, 06:37 PM #3Senior Member
- Join Date
- Mar 2010
Apr 21, 2014, 06:55 PM #4Senior Member
- Join Date
- Sep 2010
- Cackalacka border beaches
She blinded me with science.
And that link w/ Knox on the bonzer only confirms that those things are a waste of plastic foam and fiberglass. Please let them go away and let's move on.
Wish the "quad" was more defined in terms of the hull shape. I mean you can put 4 skegs on any shaped hull and call it a "quad" whether a fish, hot rod squash performance thruster, gun, log or whatever. And not withstanding where the fins are stuck on - pushed together, spread apart, on the corners, toed in or not at all. Too many variables to quantify into one term.
Apr 21, 2014, 06:58 PM #5
I think they give the deets on the fin placement for the quad used in the study
Apr 21, 2014, 07:48 PM #6
thats a very serious report for something like surfing. i read a report similar to that this morning about solar panels. had the same graph.
Im a fan of the quad. its just one aspect of design but i think it helps this older guy surf closer to the way he did in his twentys. when i do a top turn i make make less spray on a quad which should mean less energy wasted. I make more sections which keeps me intrested so i stay in the water longer than if i wasn't making them. There are so many other design factors to consider besides fins. I have two quads. one is a great board shaped similiar to an older thruster but sometimes i found that it was racing out in front of the pocket and had to always be cut back when a more vertical approach could have been taken. I wanted to keep the easy speed aspect but stay more in the pocket so another one was shaped a little shorter with a fuller plane shape, a fuller rail and a little more nose rocker. the thing turns on a dime with less effort to generate speed when needed.
im not saying a quad set up is better than a thruster set up. im saying they are better for me.
Apr 21, 2014, 08:24 PM #7
It "proves" what surfers have been saying all along about the difference between thrusters and quads... that quads go faster, and carry more speed through turns than thrusters. Why? Because you generally don't push quads into the higher angles of attack that you do thrusters. One of the main benefits of quads is that they have larger turning radii than thrusters, but carry much more speed through the turn. And if you give them a degree or so more cant, they generate more lift, especially in smaller surf, which translates into more speed... because it's not just the fin lift and drag you consider... it's also how much drag the hull creates when planing, and vertical fin lift helps address that.
To surf a quad well you have to have a quad style. If you are a flowing surfer connecting turns etc a quad is perfect. If you want to get vertical all the time a thruster is better and offers snappier turns. I think a quad can do almost everything a thruster can just not as good. A thruster on the other hand can never generate the easy effortless speed of a quad without it becoming a pumping down the line mess. I'm a quad guy through and through, just fits my style. Rode a thruster all winter because I broke a quad box on my 5 fin. The thruster did great in hollow surf and allowed me to get some big vertical snaps. Once the winter guts dropped out of the swells I have been suffering, time to get back on he quad for me.
Apr 21, 2014, 10:20 PM #9
- Join Date
- Jan 2009
- milton delaware
Apr 21, 2014, 11:03 PM #10
but let me guess, you've never ridden one, right? so that makes you the ultimate authority on bonzers.