HI ALL, I'M ON MY 2ND HYPERNUT, 7'2" X 28". I'VE BEEN RIDING IT WITH THE STANDARD 4.7" FRONT FINS AND A SET OF 3 1/2" REAR FINS.
I'M LOOKING TO GET LARGER FRONT FINS- 5.5" FINS USUALLY THESE FINS ARE FOR TWIN FIN SURFBOARDS.
I TRIED 5" FRONT FINS AND SAME 3" TRAILERS ON MY OTHER SUP-NAISH RAPTOR 7'X31" AND THEY WERE GREAT. THAT'S WHY I'M THINKING 5.5"S ON MY HYPERNUT MIGHT LOOSEN IT UP EVEN MORE. MY FRIEND SAID THAT MAYBE THE 5.5 S ARE POSSIBLY TOO LARGE FOR A SUP AND SNAP THE FINS OR DAMAGE THE PLUGS.
ANY THOUGHTS ON THIS PLEASE?

Twin fins can be too big and rip out the old round FCS plugs that were not reinforced on old prone surfboards, but there is no risk on SUPs as they are build to stand higher forces. Especially on sandwich boards, and brands having a windsurfing or kiting experience like Starboard.

However, I would highly suggest that you try Quobba fins, it will be a performance jump much bigger than any other kind of traditional fins.
Either a thruster set, Large if you favor grip, Medium if you favor speed and glide, or mail quobba to have a custom quad set with two front L and two rear M either the side fins for more grip or 2 center fins for smoother rail to rail.

My "tomo-like" small wave board:



A faster and more lively setup than the twin fins I used before: Here with 5.61" AM twins, but I also used MR ones for slower waves, and small 3.47" TC rears:



Helpful hint: the full dimensions of all the FCS fins: www.surffcs.eu/pages/fcs-fin-data

I used to windsurf a carbon hypernut with some 6" sidefins. I didn't surf it with fins that big, but I don't think it would be a problem.

I snapped one of my front fins off on my hypernut and stuck in smaller fronts as a temporary replacement. It loosened the board up but lost a bit of drive which was what I had expected. I would have thought that the 3" trailers vs the longer 3.5" trailers were what loosened up your Naish Raptor. Smaller fins on the back make it easier to pivot. The back fins on the latest hypernuts are smaller than on the older models and really lift the performance. Of course the amount of rake etc also make a big difference .... as in life, size isn't everything!

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steve8 said..
HI ALL, I'M ON MY 2ND HYPERNUT, 7'2" X 28". I'VE BEEN RIDING IT WITH THE STANDARD 4.7" FRONT FINS AND A SET OF 3 1/2" REAR FINS.
I'M LOOKING TO GET LARGER FRONT FINS- 5.5" FINS USUALLY THESE FINS ARE FOR TWIN FIN SURFBOARDS.
I TRIED 5" FRONT FINS AND SAME 3" TRAILERS ON MY OTHER SUP-NAISH RAPTOR 7'X31" AND THEY WERE GREAT. THAT'S WHY I'M THINKING 5.5"S ON MY HYPERNUT MIGHT LOOSEN IT UP EVEN MORE. MY FRIEND SAID THAT MAYBE THE 5.5 S ARE POSSIBLY TOO LARGE FOR A SUP AND SNAP THE FINS OR DAMAGE THE PLUGS.
ANY THOUGHTS ON THIS PLEASE?

I only use Quobba fins (same as colas photo) in my Hypernut (6.10) or large Cdrives in front and small/medium Cdrives in back when the surf in not that good :-)

JUST GOT BACK ONLINE. THANKS HEAPS GUYS FOR ALL OF YOUR ADVICE !!!
SOUNDS LIKE A FEW GREAT OPTIONS TO CONSIDER, WILL CHECK OUT YOUR SUGGESTIONS AND TAKE IT FROM THERE.
P.S I'M 64 KILOS. I'M ONLY RIDING MY SUPS UP TO 4 FOOT SO FAR, ANY BIGGER'S A BIT HARD TO MANAGE AT THE MO SO THEN IT"S BACK TO MY SHORTBOARDS. I'VE ONLY RIDDEN THIS HYPERNUT PROBABLY A DOZEN TIMES, STILL FALLING OFF A BIT WHEN I"M NOT PADDLING OR RIDING, THE 3 INCHES NARROWER FROM THE RAPTOR IS TAKING A BIT TO GET USED TO BUT SO FAR SO GOOD.
THANKS AGAIN, HAPPY SURFING !!!

Anyone tried different fins on the hypernut that might speed up the paddle speed and make less yawing. I've got the 7.8 hypernut great board but just doesn't paddle quick enough for the bigger fatter waves. Any suggestions on fins to improve paddle speed without to much effect on manoeuvrerable ability on a wave.

Interesting, very interesting.
I am also near your weight (68kg) and have the exact same board (7'2 x 28 hypernut).
i didn't like the fins at first (compared to my notm fbrister( but got used to them and it ripped).

im gonna try some 50/50 foil fins for the back rear sand see how that goes.
i have some sic three fours which can either be a thruster or quad. Great fin

I think any noticeable improvement of fin size to the affect that it Is effected in paddling means that it would probably be not good for surfing.
i went through the same thing when I first started- in truth I jst wasn't good enough for the board yet and no 8 or 9ft fin would really solve that.

a much large centre fin did help with stability and paddle but it also made the board hard to turn etc.
for a beginner, this might not be bad thing to be fair

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dkeating said..
Anyone tried different fins on the hypernut that might speed up the paddle speed and make less yawing. I've got the 7.8 hypernut

Fins wont help you, especially since your hypernut already has parallel rails and is not extra short.

You need to work on your paddling technique, especially 2 things:
- keep your paddle shaft in a vertical plane
- visualize the forces in play, the force of your paddle must pass through your board center of resistance
See: www.seabreeze.com.au/forums/Stand-Up-Paddle/SUP/Tips-for-straighter-paddling#1604649

I'll add that you must understand that fins grip depend on the board speed. So pull gently and progressively on your paddle while the board doesnt have a lot of speed and the fins do not yet provide grip. Basically when starting to paddle, be very gentle on your first stroke.

This said, C-Drive fins are the ones that best tame the row effect. But it is much more efficient to work on your paddling technique.

Dkeating. I have surfed a hypernut quite a bit and while I agree it is a slow paddler on flat water I have always found it gets into waves pretty easy with the stock fins. You just can't roll in from outside like you can on a longer board. I think if you move in a bit you will have more luck. I often start parallel to the swell, just using a little j-stoke(as colas mentioned) to keep the board moving so you are not starting from dead stop. From this position it is easy to read the swell and if you are far enough inside it should only take a few powerful strokes and tilting the board down the face to get in. The power strokes swing the board from parallel to the swell to heading down the face so the problem with the board yawing is now an advantage.