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 Post subject: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sat Dec 26, 2009 11:22 pm 
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Joined: Wed Oct 17, 2007 6:42 pm
Posts: 171
Does anyone has any experience if removeing the midle fin from a thruster kitesurf board will improve it's lightwind ability?
I've seen some videos of people doing that and the idea behind that is suposed to be that it'll have less drag (but also thinking more skaty and difficult to jibe)
Any imput please??? I have a 6.0 JL kitesurf board and i'd like to know if by doing that i can improve its lightwind abilities.


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sat Dec 26, 2009 11:36 pm 
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Joined: Wed Dec 17, 2008 10:45 pm
Posts: 92
I've done sort of the opposite. I removed the outer two thruster fins and left the center fin in place. The outer fins are the ones that are toed in creating drag and negative lift, and if you are not cutting across a wave face or slashing a turn I don't think these are needed, IMO.
I did notice that the board was fast and accelerated well, but I withold final conclusion because I had kite trouble at that time as well.


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sat Dec 26, 2009 11:37 pm 
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Joined: Wed Nov 21, 2007 1:54 pm
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Location: US
I ride my freestylefish that way. The board gets super loose and gets up to speed quicker in light wind.


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sat Dec 26, 2009 11:42 pm 
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baller wrote:
I ride my freestylefish that way. The board gets super loose and gets up to speed quicker in light wind.


diddo!. :thumb:


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sun Dec 27, 2009 1:28 am 
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Joined: Sat Mar 13, 2004 6:18 am
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Location: Winnipeg, Canada
I have also tried it with different side fins in a couple of different boards. I made plugs to cover the fin cavity too. One set did improve light wind performance and upwind ability a little while the other set did not do as well. Both sets were looser and a blast to ride though.

I also tried it with just the center fin. I was very surprised that it was even possible. The light wind performance was enhanced tons but I found I could not go upwind any better and lost a lot of top end and upwind ability if the wind came up a little. It was way too loose. Perhaps with a different fin.

These things are very quick and easy to try.


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sun Dec 27, 2009 6:46 am 
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Joined: Tue Feb 19, 2002 1:00 am
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Location: Kite Shop owner in Bali
Not long ago I broke my middle fin on my thruster and was not doing very well with just the side fins!
We were doing a marathon and It was hard for me to go upwind.
Maybe you will have to use bigger side fins!
Bye Jankie


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sun Dec 27, 2009 1:44 pm 
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Broke a side fin on my Thruster once. The board did not go so well upwind on the side were the fin was missing (did not notice any change on the other side), the board would spin out if pushed hard when carving on the broken side. Cut backs with slide (grind) without the side fin were easy and fun .


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sun Dec 27, 2009 3:14 pm 
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Joined: Thu Dec 04, 2008 9:06 pm
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Small waves I always leave the middle fin out. No problems staying upwind. Board is so much looser, easy tail slides, even when jibing :)

Bigger waves, with middle fin, otherwise too loose and sketchy when too much power in your kite and speed in your board.


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sun Dec 27, 2009 6:56 pm 
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Joined: Mon Aug 01, 2005 11:02 am
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Location: Windwards Caribbean
i am of the same opinion an jeroenbali.
small mushy fully smackable waves i always ride with 2 fins. easier to gybe and fun to throw around, tailslides etc. i never noticed the difference going upwind.
bigger stuff find you need the center fin or its to skatey
i am riding an LF skate 6'2.


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 Post subject: Re: Removing the midle fin of a thruster kitesurfboard???
PostPosted: Sun Dec 27, 2009 7:57 pm 
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Joined: Tue May 24, 2005 3:38 am
Posts: 3327
Location: Malibu
I messed around with diferent fin combinations... all sorts of combinations on thruster Setupa and twin fin fish.

Smaller fins on the 5'10" fish were great, but skaty untill you pick up speed.

One or two fins on a thruster setup were similar. Single fin worked quire well with a very concave board.

However the best results I got was with what I call "Twisted fins"

What I do is reshape my fins so as to creat a progressive reduction of toein.

Do a search for my earlier thread twisted fins.

The are great and pretty easy to make.

Cheers

Fred


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