Tri-fin Conversion

downwind dave · Post by **downwind dave** » Tue Apr 21, 2015 1:31 pm

no cant and toe is 'a smige' (width of my pencil line). funny thing when you start trying to make precise measurements on your board, you can find it's not as symmetrical or straight as you thought.
you should chop up the RRD and make a 210cm stubby, they are so hot right now!

thanks DM!

stokeometer · Post by **stokeometer** » Tue Apr 21, 2015 11:06 pm

Here are some pics from my first 2 hours in the shaping bay:

http://wtfbc.ca/viewtopic.php?f=18&t=1051

If all goes well, it might be ready for the weekend!

DavidM · Post by **DavidM** » Wed Apr 22, 2015 5:11 am

Nice work !!!

downwind dave · Post by **downwind dave** » Wed Apr 22, 2015 8:32 am

looking good! i noticed you have used the left and right boxes , are those the canted ones? If you run symmetrical (centre) fins in a left or right box you will need to make that extra little divot on the base for the set screw to key into, this ensures you don't lose a fin if the screw gets loose. you probably knew this!

stokeometer · Post by **stokeometer** » Fri Apr 24, 2015 10:25 pm

Downwind Dave, they're level (no cant) boxes. Didn't even know you could buy boxes with cant inbuilt

The minimal end result cant is from the V bottom.

Here are the goods:

Before my poor man's carbon finish.

With carbon finish.

BRING ON THE SLASHING!

downwind dave · Post by **downwind dave** » Sat Apr 25, 2015 9:27 am

Looks pretty badass! i like how you painted the whole tail not just around the boxes, i might go do that, my 2 red patches look kinda dumb

fcs makes 5 and 9 degree side boxes (colour coded black and orange) to compensate for bottom contours, or you can put em on a flat bottom to get your fin canted over.

stokeometer · Post by **stokeometer** » Sat Apr 25, 2015 11:04 am

Thanks downwind Dave!

I'm thinking of making the trek over to the island tomorrow for the SE forecast for a maiden Columbia Beach session and the first test on the new Holy Grail Shredding Machine.

Last time I made the trip over it didn't feel like too much of a gamble with SE30 forecasted all day at Comox, but this time it might be a bit of a gamble - but I'm feeling lucky.

Thoughts? Cheers.

downwind dave · Post by **downwind dave** » Fri May 29, 2015 12:52 pm

so here's the result of a couple hrs sailing with my new thrusterz:

this is on the left side but the starboard box cracked too, both in the area surrounding the inside set screw. i did sail them pretty hard but i didn't hit anything. my feeling is the fusion boxes are plenty strong, but there is just not enough plastic surrounding the screw for whatever load it takes.

on the plus side, the new fins felt great and the board is still plenty fast. cant see any reason to not run the side fins now that i have em and the boxes are there, so i'm wondering if i should just glue em in and treat it like a surfboard with glass-ons.

KUS · Post by **KUS** » Fri May 29, 2015 1:22 pm

downwind dave wrote:the new fins felt great and the board is still plenty fast.

hmm but isn't this ur big board and wasn't it plenty windy? Not surprised on all counts....lots of loading and speed due to high winds...bet a different outcome in 16-18kn

TheLaw · Post by **TheLaw** » Fri May 29, 2015 1:29 pm

I think we are just lucky he didn't leave it on the beach. : )

downwind dave · Post by **downwind dave** » Fri May 29, 2015 1:44 pm

lol funny thing is i almost had to step right over my stuff when i went down to get my board.

ok Kus no official verdict till i hula out in 16 kts. spoiler alert 'hey this sucks'

SmallWaveSteve · Post by **SmallWaveSteve** » Fri May 29, 2015 1:50 pm

It may be worth you guys looking at Probox Hawaii fin boxes over the FCS offerings. They will still accept FCS fins, in addition to their own proprietary ones, futures can be modified easily to fit as well.

The fin is more secure when in there, but the insert for changing the fin cant will rip out with the fin before your fin box blows up. Their installation jigs & router bit are the cheapest around too as an added bonus, and you can get some adjust-ability too.

I have some installed on a wakesurf/kiteboard, and a set of boxes that haven't been installed yet if anyone wants to take a look.

winddude · Post by **winddude** » Fri May 29, 2015 2:01 pm

I'd go slot-box if you can find or build one. You can only seem to order them from a few guys in Australia and Europe, http://www.moocustom.co.uk/product-cate ... lot-boxes/ , but they aren't cheap. I've tried talking to Trident and no luck

2nd choice would be mini-us, you can cut down a standard us box to make a mini US.

downwind dave · Post by **downwind dave** » Fri May 29, 2015 2:18 pm

slot box and mini us wont hold a fcs fin which is why i started my experiment in the first place (had a stack of fins). unless you run a fcs/longboard box adaptor. probox i don't know much about. maybe on some other board! my feeling is if you are windsurfing the stuff designed for surfing (though cheap) might not be the best bet. i hope you other guys trying the fusion box have better luck.

winddude · Post by **winddude** » Fri May 29, 2015 2:25 pm

downwind dave wrote:slot box and mini us wont hold a fcs fin which is why i started my experiment in the first place (had a stack of fins). unless you run a fcs/longboard box adaptor. probox i don't know much about. maybe on some other board! my feeling is if you are windsurfing the stuff designed for surfing (though cheap) might not be the best bet. i hope you other guys trying the fusion box have better luck.

probox looks similar to a scaled down slot box. My guess is the plastic isn't strong enough, similar to the fcs, when you look at the surf boxes vs the resins used in windsurf boxes, it's pretty obvious the windsurf ones are much stronger.

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