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Self-Tacking Jib for AI
http://www.hobie.com/au/en/forums/viewtopic.php?f=71&t=55148
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Author:  vetgam [ Sun Jun 28, 2015 8:12 am ]
Post subject:  Self-Tacking Jib for AI

In the interest of simplifying sailing with a jib and to eliminate lines in the cockpit, I experimented with a few ideas this weekend. My goal was to eliminate the jib sheets altogether and make tacking no more complicated than the original stock AI.

I was inspired by Roger Mann's concept of furling the jib into the main and his idea of using a short line attached to the mast to allow for self-tacking. I first tried this method. I was shocked by how well it worked. Here is a pic of my Roger Mann method.

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Although this worked well, the perfectionist in me wanted to eliminate the jib curl at the clew and to prevent excessive cupping of the jib. So I ran, a line under moderate tension, from mid aka to mid aka and used an O-ring to attach the clew to the line. This accomplished both goals for me.

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This left the cockpit clean with only one line more than a stock AI. That line is attached to the tack of the jib and allows you to bring the jib in when taking it down. Here is how the cockpit now looks.

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Here is the self-tacking jib in action. Winds were about 4-5 mph.

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By disconnecting the clew quick release at the O-ring, I can easily furl the sails. Here I have furled the sail 1/2 way making a shape like a lateen sail. Although not very efficient, it still sails.

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Here are the sails completely furled.

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Finally a few more views showing the slot between jib and main.

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Videos to follow. I bet you will be amazed how well it worked.
I was surprised by a quick storm during this sail. I have video to show me frantically furling both sails as the first gusts of wind hit me from behind. The day turned out to be the ultimate test for the jib setup.

Vetgam

Author:  Blasius [ Sun Jun 28, 2015 9:41 am ]
Post subject:  Re: Self-Tacking Jib for AI

:shock:

That sounds really amazing .......

Author:  TI_Tom [ Sun Jun 28, 2015 11:07 am ]
Post subject:  Re: Self-Tacking Jib for AI

I like the idea.

Sent from my SPH-L720T using Tapatalk

Author:  NOHUHU [ Sun Jun 28, 2015 11:12 am ]
Post subject:  Re: Self-Tacking Jib for AI

Me too. But what about downwinding with this design?

And yes, VG, we can clearly see the clouds of Mordor catching up with you.

My mind would have been on other things too. :wink:

Author:  NOHUHU [ Sun Jun 28, 2015 11:24 am ]
Post subject:  Re: Self-Tacking Jib for AI

Oh, and I like your outhauls!

Author:  vetgam [ Sun Jun 28, 2015 12:15 pm ]
Post subject:  Re: Self-Tacking Jib for AI

Worked on all points of sail to advantage except running. I hardley ever run so I'm good with that.

I will be creating a loop at each end of the jib traveler. I can use the jib clew quick release to lock the clew to either side. The plan was to use it to heave to but it would work well for running as well. I find that I heave to a whole lot more than I expected and would miss it otherwise. Sometimes it's nice to stop and eat or enjoy the sites without actively sailing.

Vetgam

Author:  NOHUHU [ Sun Jun 28, 2015 12:58 pm ]
Post subject:  Re: Self-Tacking Jib for AI

Yes. Would be nice having both sails outhauled. Maybe wing a wing.

Without a boom, I'm not sure how well the heave to will go, but let us know.

Self tacking is definitely cool. Do you think a bungee traveler might help the jib shape a little better and auto adjust to puffs?

Author:  vetgam [ Sun Jun 28, 2015 1:48 pm ]
Post subject:  Re: Self-Tacking Jib for AI

Without a boom, heaving to works fine now in mild to moderate winds. Can't imagine it not working with the jib locked in a fixed position.Have not tried heaving to in high winds. I don't think I have the nerve to find out.

I think a bungee will not be firm enough to pull the clew aft and I would expect the O-ring would not travel as freely, possibly limiting the angle of tension on the clew. Will have to give it a try.

Vetgam

Author:  skymax [ Sun Jun 28, 2015 7:02 pm ]
Post subject:  Re: Self-Tacking Jib for AI

Nice job, well done.

For the rest of us who don't build our own sails etc is there any hope of the Hobie Foresail emerging in the next Three years?

Author:  vetgam [ Sun Jun 28, 2015 7:52 pm ]
Post subject:  Re: Self-Tacking Jib for AI

This sail maker has agreed to make and ship this exact jib to anyone that wants one.

http://www.bankssailstx.com/

Tell them you want the Code Zero Hobie Adventure Island Jib made for Greg Matt.

Cost me about $450. No permanent mods are necessary and harware will cost you about $50.

Vetgam

Author:  vetgam [ Sun Jun 28, 2015 8:36 pm ]
Post subject:  Re: Self-Tacking Jib for AI

Here is the video of the first sail and storm test of the self tacking jib.





Vetgam

Author:  Blasius [ Tue Jun 30, 2015 12:56 am ]
Post subject:  Re: Self-Tacking Jib for AI

Dear Vetgam,
could you share the dimensions of your jib?

Thanks

Author:  mingle [ Tue Jun 30, 2015 2:10 am ]
Post subject:  Re: Self-Tacking Jib for AI

That's an absolutely superb add-on... The simplicity of the setup makes it ideal for anyone who want to add a bit more sail area...

Do you find (in stronger winds) that when the jib is powered it tents to push the nose to the A.I. down further?

I wonder if he ships to Oz... :-)

Cheers,

Mike.

Author:  fusioneng [ Tue Jun 30, 2015 4:31 am ]
Post subject:  Re: Self-Tacking Jib for AI

Im just imagining here based on my experience with jibs on my TI's that on an AI with the main mounted closer to the middle of the boat, a jib mounted to the bow on an AI would be tilted enough to create some lift to the bow, actually helping prevent the bow diving problem. In my experience with many jib designs on my TI, I found adding the bowsprit and tilting the jib so it can also create lift made all the difference in the world (for me anyway). The angle on Vetgams jib (with no bow sprit) looks to be about the same angle I found to work well on my TI (with the bow sprit). Hopefully if his is working the way mine did, it completely eliminates the bow diving problem and in my case when pushing hard the jib pulls the bow out of the water 3-4 inches by creating lift. Obviously the AI and TI are completely different animals, and I have zero experience with AI's (I have never even sat in one). Watching his video, I would rank his setup as one of the best I have seen. I would think with the AI being so small, with that giant rudder (same rudder the much bigger TI uses) that any kind of weather helm would be the last thing on his mind.
All just my observations
Bob

Author:  stringy [ Tue Jun 30, 2015 2:31 pm ]
Post subject:  Re: Self-Tacking Jib for AI

That is impressive Vetgam! 8)
I know you don't want extra lines but an un-furling line on the port side would smoothen up the process and eliminate the need to reach forward and turn the mast by hand.

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