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docgr 24th April 2011 03:42 AM

"Closing the gap" problem

Im 72 kg for 1,77 ... using the i-sonic 107 with the NP RSR 7.8 evo III - deboichet 38 cm fin

The problem is: when i close the gap and start to go faster, the rear end of the sail easily touches the water ... and of course this slow the speed of the board.

I move the mast 4 cm back of the center ... it helped, but prefer not to move it far more back in order to avoid the nose to come up.

Any hints or explanation on that?

Thank you


COACHG 24th April 2011 04:53 AM

How high do you run your boom?


Maximus 24th April 2011 08:19 AM

First try moving your harness lines back.

docgr 24th April 2011 05:27 PM


the boom is set in the middle of the sail opening + 2-3 cm.

I've already moved the harnesses lines, but ...


Maximus 25th April 2011 07:22 AM

Keep your base near the reccomended setting. If still touching, move lines a little more further back, reduce downhaul slightly, crank on tack strap. Also make sure with E3 you have some positive outhaul.

Ken 25th April 2011 09:01 PM

I don't think this has anything to do with harness line placement or where the mast foot is placed. I have an iS 111 and TR Maui race Sails and have experienced the same problem. When rigged to specifications, the tack strap attaches to the middle of the universal tendon with the foot of the sail almost touching the board.

Simply rig with a few more centimeters on your extension to raise the sail a little higher off the deck of the board.

Harness line should be attached where the center of force is when fully powered. Move them back and the front hand has too much pull. I guess if you have an adjustable outhaul, you can move the lines back and flatten the sail, but then you may cause your rig to depower and become twitchy.

Your 38cm fin may be a little small too, but that depends if you are free sailing or downwind slalom. I weigh 78 kg and use a Tectonics Tomcat 42, and it works great for freesailing. Yesterday, I was on the iS 111 with a TR 4 6.6 with the 42 fin in 18-22 knots and had no problem with the fin being too large. Just free sailing and hit a peak speed of 30.5 knots on one full reach in a slightly protected area (smaller chop).

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