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  Topic Review (Newest First)
05-05-2010 07:36 AM
MMR I used zig-zag stitching because that stitching holds up better (than a straight stitch) on fabric that is stretching/contracting. I also was thinking that in my prior experience, a straight stitch on stressed fabric can be a weak point (like a line of perforations...TEAR HERE)

I did not see the shrinkage issue you mention, but then again, this was my first large project for the boat, so there was a big learning curve. The biggest was and still is the different techniques and strategies needed verses sewing quilts or clothing...

We're going to try a 4th lazy jack attachment point and see how that works. The mounting point for the lazy jacks on the mast are factory original; we'll see how other adjustments work before moving those. The original L J had only two attachment points on the boom, so the angles may not be good for what we're trying to do with the sailpack.

Here you can see the original configuration of Lazy Jacks:
05-05-2010 04:42 AM
Originally Posted by MMR View Post
-Lazyjack attachments will be loops or something on the sailpack itself, not on the batten/pvc pipe. The current pvc pipe arrangement is not stiff enough to prevent sagging along the length of the sailpack.
I don't think that is an attachment problem. Attaching the lines directly to the pipe is the most stiff configuration; otherwise you also have stretch of the canvas and webbing in addition to flexing of the pipe. I think an additional support point or using battens instead of PVC would be a better way to correct this. In addition; the mounting point for the lazy jacks on your mast looks a bit low. The 2'nd and 3'rd row of lines are at a steep angle and are probably not pulling vertically enough to support the pack and prevent sagging. You might consider moving the lazy jack blocks up to near the upper spreaders; or on the upper spreaders to help widen the slot and prevent slapping of the jack-lines on the mast.

VERY NICE Job on it! I noticed in some of the photos that you used a zig-zag stitch on many of the seams instead of a straight line. Did this help prevent the sewn cloth from 'shrinking' due to seam pucker? The article by Linda Moore mentions up to 3" of shrink over 18' of length. Did you have this issue or is it more of a machine tension adjustment problem?
05-04-2010 02:06 PM
MMR AHA! Thanks!
05-04-2010 01:46 PM
jbondy I don't have a pic with me, but you can see it here:

YouTube - Doyle Stackpack with Tides Track
05-04-2010 12:24 PM
MMR Joel

Can you post a picture of that additional material that pulls the cover flat against the sail? I'm having trouble visualizing it...
05-04-2010 12:22 PM
jbondy FWIW - We just installed the Doyle StackPack. In addition to the cover, it has additional material attached to the top edge of the cover and sewn above that to the sail so that when the sail is raised, the cover is pulled up flat along the foot of the sail. I raised the sail for the first time yesterday just to make sure all the lines were running free (the reefing line wasn't), but did not sail. I noticed when heading into the wind, the extra material billowed, which seemed to me would affect the flow of air across the foot of the sail. I didn't have the halyard fully tensioned, though, so maybe it won't be an issue. But I've got to say that putting the sail away went so quickly that I'm still feeling like I must've forgotten something. I was done too quick!
05-04-2010 11:23 AM
MMR I'm going to redo ours, too, at some point. Version 2.0 will include:

-Flap cover over zipper to reduce water coming in.
-Attachment points at mast and boom end to keep sailpack taut
-FOUR lazyjack attachment points instead of three to support the pack better
-Lazyjack attachments will be loops or something on the sailpack itself, not on the batten/pvc pipe. The current pvc pipe arrangement is not stiff enough to prevent sagging along the length of the sailpack.
-If I feel like it, maybe some blocks to have single line zipping/unzipping of the bag.
-Also considering mesh "windows" in the side of the sailpack to improve drainage and air flow.

And, the next one will be PURPLE
05-04-2010 11:15 AM
imagine2frolic MMR,

Thanks for the pics. It definately looks like a redo on my new sail cover!.......i2f
05-04-2010 11:13 AM
norsearayder i just got a riding sail from seems to be of good quality
05-04-2010 11:12 AM
MMR I made ours as two "slabs", each with their own bolt rope, slid into tracks riveted to the boom.

See pics at SailPack Construction Pictures
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