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Topic-icon New Jibsail for Triak

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1 year 3 months ago #120 by multithom
multithom created the topic: New Jibsail for Triak
I've changed my Triak a bunch over the years. One of the first changes I made was to add a jib that is tacked between the first two eyes on the bow which puts it about a meter from the mast. I built a snuffer that fits just aft of that location patterned after the Triak supplied spinnaker snuffer in that it hooks onto the seam that runs the length of the boat on both sides. Anyway, now that I can sail comfortably in bigger wind, I can now use a bigger jib; so today I built a full size jib to fit into that foretriangle (previously I'd used a fractional jib there). I used Surlast fabric so it can snuff--truthfully, I wish the fabric was lighter, this stuff is about 7 oz fabric and that's pretty substantial. It doesn't snuff easily, but it does snuff...haven't tried it out, yet, but I will this weekend if it doesn't rain. I may need to only use this jib in summer and build a lighter "windseeker type" for winter light winds.

You should know that I got rid of the Triak supplied mainsail since the winds here (prior to the float mod) make me have to reef in anything above 10 kts, and usually the wind is stronger than that in the spring/summer/fall). I built a radial head pintop instead that make the mainsail about a half sq meter smaller. The pin top also helps point and you don't need battens with a pintop, so there was a lot of good things about making that change.

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1 year 3 months ago #121 by multithom
multithom replied the topic: New Jibsail for Triak
Well, I tried it today. Wind was only 6-8 kts and 2.5 kt current coming in the same direction as the wind. Wasn't pretty. The additional sail area was not an improvement. There was more heel and lots of lee helm. I'll make a movie and show a few minutes but it wasn't a successful sea trial. I think in adverse current and light(er) breeze I need to go mainsail alone and paddle through the tacks if I'm going to go upwind at all. I may put the Triak spinnaker back on the boat for winter since it is made more for close reaching than running like the one I made, that way if the current allows, I can use it to go to weather. I'm also going to make a wind seeker.

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1 year 3 months ago #122 by multithom
multithom replied the topic: New Jibsail for Triak
Here's the link to the video.


You can see some of the problems I had with it.
Yesterday, I demounted the jib and did some testing. The actual sheeting angle is OK. What was happening turned out to be related to fabric stretch. Since I made the jib from soft polyester cloth, I didn't allow for as much stretch as the fabric will undergo while sailing to weather. So I couldn't hoist it far enough to actually get the jib luff on centerline-last few jibs I made I sewed a nonstretch cord into the luff so the fabric wouldn't stretch beyond the "fake forestay" I sewed into the luff. I didn't do that with this jib because luff stretch is an important tool when making a crosscut sail. So, I shortened the sail by about 10" and I'll try again in a little bit.

While I was messing around, I changed from the running spinnaker that I made for the boat and put the Triak spinnaker back on the boat. The Triak spinnaker has a short luff for the amount of hoist that there is but it is also cut pretty flat to enable one to use it going to weather (sort of a reacher). We'll how things go.

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1 year 2 months ago #133 by multithom
multithom replied the topic: New Jibsail for Triak
I added the "forestay" which is just 1/8" dacron line that is used on big boat sails as leach cord. It is pretty non stretch-enough for this tiny sail, anyway. I tried it out today. In bigger breeze it does still fall off to leeward, I can't (won't ) tighten it any further since I don't want to put that much load on the mast. It has a very pretty shape today and added a lot of drive to the sailplan. Still adds a lot of heel, though, as well; but that's what the bigger floats are for. I also used the North Sails red spinnaker that came with the boat on a reach. THAT was exciting due to gusts and wind shifts...if I hadn't had big floats, I'd have been dumped a few times. Anyway, it was a great sail...most fun you can have with clothes on. I'll post a video tomorrow.

Next project is to build the windseeker. The fabric I got is very light polyester kite fabric. It isn't stretchy at all, not even on the bias. It "ought" to hold its shape better than nylon (maybe even better than this surlast) so I'm tempted to just make a light wind jib out of it instead of a windseeker. Maybe I'll try a tri-radial cut; haven't ever done that before.

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1 year 2 months ago #135 by multithom
multithom replied the topic: New Jibsail for Triak
As I said I would do, I made another new jib. This time out of ripstop kite polyester. Very light weight fabric but no stretch. It took about 4 hours total to sew together in the garage. There is so little time/effort/money involved with making jibs (or mainsails) for this boat that I can afford to play with the sailplan. This time I used more "luff sag" in the design plan. It "should" point better with less camber placed further forward. We'll see. If I get out with it, I'll post a video. I'm currently also purchasing new sailcloth for the jib and mainsail from Contender fabrics. Contender sells a heavy-duty ripstop polyester for high load reachers on multihulls. It ought to make a really good snuffing jib. I'll go with a dacron mainsail again, this one has worked well for a couple years, but nothing like new sails to make you feel young again.

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