Adventure Island Jib and Lee Helm

Sailcut CAD is a popular program. I never used it to make a sail, though since I didn't have the capability to translate the program output into something that tells me how to cut the fabric. Let us know how it works for you.

Code zero is Very lightweight fabric and I expect it would make a nice little jib for your boat. Let me know if your sailmaker has trouble getting it, I have enough for your jib that I'll never use. I chose to use nylon for my jib because its color matches the mainsail dacron color and the spinnaker color. The jib works well in the wind ranges I use it in for upwind work, but won't work well at all in bigger winds going to weather. I may add a few lines of kevlar just for fun and see if it helps keep the sails' shape in the bigger winds. The 3DL site kinda shows what is supposed to be done.

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R/Thom
SeaRail 19
Triak
BMW C600
Formerly Getaway with Custom Spinnakers
Formerly raced F24 Mk II

I did some prototype jibs from nylon, to prevent them from stretching too much I just ran a 1/2 inch wide stitch (with 2 center stitches (not sure what it's called) right into the material (no backing) about every foot or so. It worked and I got a little better performance from the fabric, nothing fancy or accurate, just blasted thru the machine quickly. It also helped prevent them from luffing so easily ( a problem with really light fabrics when trying to use for jibs, definitely heavier fabric obviously is preferred).
Bob

Yea, I played with Sailcut more tonight and I can't figure out how to print out anything useful to cutting panels either. So close but yet so far.
Must need another program to export to.

Greg

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Greg

2016 AI - Spinn & Jib

“Out of sight of land the sailor feels safe. It is the beach that worries him.”
– Charles G. Davis

Here is a graphic example of why I love the simplicity of a single sail on my TI. I have personally carried out the manouvre shown in the video, but not on a 70+ footer!

https://www.youtube.com/watch?v=frPQT3T7im8

PS The yacht actually WON the Sydney-Hobart race today despite this chinese jibe, recorded on the GoPro strapped onto the skipper's sister.

A little backstory.. the 24 year old yacht "Wild Rose" was originally called "Wild Oats", and "Wild Oats XI", a later one from the first owner Bob Oatley, having just won the race line honours for a record eighth time this year.

When the current owner, Roger Hickman, went to buy the yacht in 1993, he told Bob Oatley he would have to delay the purchase as he had only raised half the purchsse price. Bob just waved off the problem and let him have the yacht for half price!

How come I never meet people like that!

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Tony Stott
2012 Tandem Island "SIC EM" with Hobie spinnaker

OMG. Now thats sailing at its best! If this jib starts lifting the boat, it's coming off. I put the bigger amas on it to prevent just such an issue. A jib has to work and be quickly powered down to be a rational addition to these islands. I think it can be done though based on the bit of experimenting that I've done. I should know within a month or so once the sail come in.

Greg

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Greg

2016 AI - Spinn & Jib

“Out of sight of land the sailor feels safe. It is the beach that worries him.”
– Charles G. Davis

Thanks for posting the video, Tony. Simplicity is good, but mastery over multiple sails is more fun for me. I enjoy the sudden surge of acceleration when the newly deployed sail catches the wind. I also enjoy the pride of accomplishment when all the sails are trimmed perfectly. I sometimes like being on the edge when I know any mistake I make will make me go swimming. That actually happened to me last week. It was too windy for the jib for upwind work (18-25 kts) so I plodded with reefed mainsail to weather, but after the turn, I deployed spinnaker and had to run deep to keep from being overpowered. Was exciting...[youtube2]https://www.youtube.com/watch?v=gGDso6t0yuk[/youtube2] https://www.youtube.com/watch?v=gGDso6t0yuk (I did the link twice cause I haven't figured out yet what works best to put links in--you'll note the water was flat despite the big wind, two reasons for that, the 2.5 kt current was in the same direction as the wind and there was little fetch in that location).

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R/Thom
SeaRail 19
Triak
BMW C600
Formerly Getaway with Custom Spinnakers
Formerly raced F24 Mk II

vetgam:
Yea to print the stuff you will need to export the DXF file into a program like Solidworks or AutoCAD ( I use Solidworks). You can then create into 2D drawings and export onto a large format plotter (would have to be a really big plotter), then just use the paper as a tracing to cut out the material with scizzors. I typically just add key dimensions and print out a simple drawing (with dimension) on plain paper (8 1/2 x 11 paper) just printed on my regular inkjet printer. I then lay it out an the cutting table measuring everything out using the drawing, then just cut away.
Here are a couple examples from my spinnaker project



The actual measurements of the noted panel on the layout table would be 49" x 25 3/4" x 49 1/8" x 26". 1/2" overlay lines are drawn onto the fabric, then when sewing time come, you just match up all the lines, and sew sew sew all the numbered panels together. By the time you get to the end the entire room is completely filled with sail (that's a 135 sq ft G2 spinnaker)

You can see the spinnaker flying in many of my videos.
https://www.youtube.com/watch?v=p1ACrUXgp0E

hope this helps

Bob

Vetgam,
I've been stalking this post for a little bit now. Just curious to see what you come up with. I've recently inherited a storm jib from a 22' Ranger, but I'm waiting to take delivery of my '15 TI to make some accurate measurements before cutting up the sail. Also, still trying to find a sail maker (little harder than I thought, but this is Nebraska).

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2015 Hobie Tandem Island Hibiscus
"Third Normal Form"

• Trampolines
• Hobie cover
• Davis Spar Fly
• Kayakbob's Sprayskirts
• Spine Board Hakas

TI-Tom, I asked my sail maker about other shapes including a shape consistent with a storme sail. He felt that the shape would not be ideal. Something about the angle of the jib sheets would need to be too far aft. I would expect a storm sail material to be a bit heavy. Is it? Once this project is compleated, the sailmaker plans to ship jib kits complete with hardware out to anyone that orders them. We will have to find a TI owner in Houston who is interested in following suit to equip and test a TI jib. Any takers out there?

Of course I will test the jib, take videos and measure any added speed and pointing ability so that those interested know what they are buying. This will become the sailmakers project and they will profit from this. My role is just to document how well it works and to work out the rigging so that the sail can be easily deployed and furled separate from the main when possible. I'm trying to keep things simple yet safe.

One issue we may have is that I had them modify my sail so that I can experiment with head sails. A long strip of canvas has now been sewn into the top 1/3 of my sail at the mast. This canvas has 3 loops as points of attachment for headsails that will furl into the mail sail as it is furled. Not everyone can or will want to do this. We may have to experiment with some other way to acomplish this so that it can be sold as part of the jib kit. Ideally it would not require permanent modifications of the sail and could be removed at will. Anyone with suggestions?

If this whole project ends up a major fail, it will have been worth it for all the fun I've had. Now if I damage the mast or mast base, I'm sure I will look back and wonder what the hell was I thinking.

Greg

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Greg

2016 AI - Spinn & Jib

“Out of sight of land the sailor feels safe. It is the beach that worries him.”
– Charles G. Davis

Bob you incorporated a wing into a spinnaker? Is this a "Bob invention" or have others tried this? Never seen such a thing. Did it improve lift? Gotta love it! Even if it didn't work, this innovation has to win some award for at least being intertaining.

Greg

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Greg

2016 AI - Spinn & Jib

“Out of sight of land the sailor feels safe. It is the beach that worries him.”
– Charles G. Davis

Bob, did you notice that the spin folds in at the top center 1/3 (noted especially at 25-26 seconds into the video). That is common in center seam spinnaker design which is why you don't see many of them anymore. There is an induced turbulence there which disturbs the leeward flow. As you noted before, the additional stitching and sailtape reinforcement there keeps the sail from stretching along that seam...so you end up with an m shape which works, but not as well as a radial head spin design. I'm about to build another symmetric radial head spinnaker for my Getaway in the next few weeks...contact me off-list if you are interested in the particulars. Basically though, it will have 5 radial head gores about 4 meters long and 90 cm as the base of each triangle. It will have another 150 cm of cloth horizontal at the base. Overall dimensions will be 18 ft by 15 ft (550 by 460 cm). I'm expecting the midgirth to be around 4 meters. I will have to cut 5 triangles of cloth. It will have only 5 seams to sew since my fabric is 5 feet wide (150 cm), I expect to do it in a day. It'll be red, blue and green since that's what I have leftover from other projects.

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R/Thom
SeaRail 19
Triak
BMW C600
Formerly Getaway with Custom Spinnakers
Formerly raced F24 Mk II

No it's a 100% bob thing. I still use that old spinnaker once in a while (mostly only down in key west where we have steady trade winds. The down side to that particular spinnaker design is its only useful downwind only, I thought adding a para foil type wing to the leading edge to prevent the sail from collapsing when trying to sail 90 degrees or less to the wind would help (didn't help much). It was just a bandaid, I need to make new spinnaker one of these days with a better more modern design.

Bob

You get extra credit points and star for thinking that one up Bob. (Not to mention for making it!)

Greg

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Greg

2016 AI - Spinn & Jib

“Out of sight of land the sailor feels safe. It is the beach that worries him.”
– Charles G. Davis

Vetgam,
Yes, the material is stiff. Although, it had been folded in a sail bag for the last 15 years or so. So, it might loosen with a little use. I figured it would be a good starting point since it's already a fairly small sail and the AI/TI jibs that I've seen are only between 25 to 30 square feet.

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2015 Hobie Tandem Island Hibiscus
"Third Normal Form"

• Trampolines
• Hobie cover
• Davis Spar Fly
• Kayakbob's Sprayskirts
• Spine Board Hakas

Tpdavis473:
Yes a radial cut design would have been much better but nobody usually shares any design specifics. Hey if you PM me some of the design specifics I can design and build one, in return I'll send you the design specs on the parafoil leading edge wing mod. The leading edge wing mod just goes along for the ride and does nothing at all when running down wind. It only engages and puffs up into a wing foil when trying to use the spinnaker on a reach (most people take their g2 spins down at that point and put up code zeros or big genoa's at that point. I was simply trying to get a little better side wind performance without increasing the heeling moment too much (wings have less heeling moment). I think I had the right idea but wrong basic spin design to start with. Unfortunately code zeros or big genoas don't work well with the TI (way too much heeling moment and weather helm due to the itty bitty rudder on the TI and the very flexible mast) so I was trying to cheat the design limitation just a little. The other dilemma I have is with my wing jib and main in low winds (under 10 mph) and my hybrid setup I already run downwind at 2x plus wind speed so if I unfurl the spinnaker it acts like a break (that's why I don't use it much anymore). My TI is specifically rigged for the typical low winds we have typically, works great upwind, and downwind but really sucks on a reach. I suspect I've reached the limitations of the basic boat design. I suspect you will have way better luck with your getaway (way better mast/sail setup and cat hulls)
Hey it's fun for me just playing around with the stuff. I have no goals or expectations, just havin fun.
Bob