Have repaired my sail two times already using tape and glue.
Because it is near the clew, it gets plenty of outward force trying to pull it apart, and the glue gives up. The rip goes right up into the dacron.
I have some Sika contact fix, which I used the first time I repaired, but I might not have given it enough time to bond correctly. Also have a speedy stitcher and was thinking of taking the sail bag apart as it's made of dacron and following along the seams to then attach the sail bag panel, which would then be glued with Sika Contact Fix.
Another idea is it possible to just cut a say 20cm wide piece of dacron following the rip, sticking a piece on either side of the sail and then stitching it together.
I have read through some of the other posts on the forum and see that most people can use Gorilla tape, but the position of the rip might make it impossible.

You can't take this to a sail maker ?. I doubt this would be an expensive to repair. Even if you had to freight it somewhere within Japan.

Tough question!
IDK what tape you've used there, but it appears to be quite adequately stuck to the sail, and the tape itself has split? In which case I'd be thinking of using a stronger tape, or more layers (with each patch having a different overlap, of course). Reinforcing fibres within the tape are only of value when they're aligned with the direction of force.
I'd be very wary of doing any stitching through the mono-film, due to the tendency to tear around stitching unless well reinforced. Not sure about the Sika contact fix, but I suspect you'd be needing a polyurethane glue for that mono-film sail material; no idea about best glue for dacron though. Or how best to remove the existing glue, which is necessary before a successful repair.
Might be worth a visit to a sailmaker for a proper repair job there! They'll surely add proper reinforcement around that clew area (which looks somewhat inadequate in the beginning) & including repair of the tear.

I'd run several layers of fiber reinforced tape across the split, to take the load. If it's possible to wrap round the edge and take it to the black strip, that should be very secure, you just need enough layers to take the load.

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jn1 said..
You can't take this to a sail maker ?. I doubt this would be an expensive to repair. Even if you had to freight it somewhere within Japan.

I've thought about it, maybe $100 (AUD) to get it to Yokohama and back, then $100 to repair.
There is a shop selling a brand new 22-23 Goya X for $ 690 (AUD), but I'm not really a big fan of Goya.
The current Severne convert sail is not really meant to be a wave sail, but it's okay when it is light wind, and I put it onto the SUP. Also not very durable, as you can see. I am just trying to give myself some time so that I can save some money and buy a sail that I am after.
Saying all that, if a sail maker were within a short driving distance, I would just get it repaired.
I also like to give things the two F's
Fix it or f**k it.

For a bodge job get some sticky vinyl like is used for sail numbers, cut a patch that goes right to the foot and leech and clew and cover the rip by about inches, think big triangle. Stick one of those each side. You can then stick what ever you want over the split and sow it down. You might want to use a smaller needle than what comes with the speedy stitcher.

And the penny drops...
I was running the tape parallel to the rip. I only get a small area for the tape to adhere to, and it just could not take the load.
The tape that I used before was from Aliexpress (www.aliexpress.com/item/1005006228071693.html?spm=a2g0o.order_list.order_list_main.35.53d31802iJHU2f)
Not saying it's good or bad.
I'll give it another go, firstly using Gorilla tape to seal up the rip (parrell) which I have not used before.
Then using the Aliexpress tape in strips going in the direction of what I think the load would do, so heading from a point towards the clew eyelit. Also using the contactfix mixed onto the other side of the Ali tape.
Do you all think that is a good enough plan?

Use full width both sides - nice and wide

www.whitworths.com.au/psp-kevlar-sail-repair-patch-240mm-x-370mm

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DavMen said..
Use full width both sides - nice and wide

www.whitworths.com.au/psp-kevlar-sail-repair-patch-240mm-x-370mm

Also on the market are the following self-adhesive tapes:
- 200mm wide mylar
- 200mm wide dacron

The problem with high stress areas you are relying on the strength of the adhesive. The wider the patch the greater the surface area to distribute the load.

If panel replacement is not economic, try one of the above tapes and see if it works.

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Henners said..
And the penny drops..>>>>>>> Do you all think that is a good enough plan?

Sounds pretty good to me.
Yes always think about load, not just closing the gap.

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Ben1973 said..
For a bodge job get some sticky vinyl like is used for sail numbers, cut a patch that goes right to the foot and leech and clew and cover the rip by about inches, think big triangle. Stick one of those each side. You can then stick what ever you want over the split and sow it down. You might want to use a smaller needle than what comes with the speedy stitcher.

Vinyl would indeed be a bodge job, as vinyl stretches. But self-adhesive sail repair cloth or tape should do the trick, bearing in mind the alignment of the weave in the direction of the load.

I'd get that properly repaired. The diversity of panels/materials and the fact that the tear almost completely separates the clew makes this a huge liability to bury under sticky tape if you spent time in any serious conditions.
You might want to factor in losing a whole set/nasty swim time into the cost-benefit equation in my opinion.

Looks like a 2019 sail... I'd say any repair over $100 is not worth it unless you absolutely love the sail. Don't know about the second hand market in Japan but here in Australia you would be able to get second replacement for $300 - $400.

If you go with Gorilla / Cloth tape or Sail Tape option I suggest before applying tape first brush a thin but well covered coat of your Sika Contact adhesive over all areas of the sail to be repaired, then let it dry for 10-15 minutes (contact adhesive must be touch dry before tape application). Your tape will stick to both Dacron and Mylar very very well.
(apply tape as per Decrepid instructions)
That should not let go with correct application
I do it all the time

Crap, that area is the worst. But the good news is it's small so you can fix it yourself easily.

You want to sandwich it with two pieces of cloth using double sided tape and stitches. Use an awl like the speedy stitcher and good thread.

I purchased some stuff to clean the sail and it arrived yesterday, ready for todays repair.
Just as I was going to bed last night, some reasonably priced Severna Blades came up for sale (5.3 and a 6.2). I've been watching this website for over a year and never seen a wave sail over 5.5 for sale.
The problem is now solved. Fate must be a member of Seabreeze.
Apologies for waiting for everyone's time.

A good upgrade from the Convert.

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Sandee said..

Ben1973 said..
For a bodge job get some sticky vinyl like is used for sail numbers, cut a patch that goes right to the foot and leech and clew and cover the rip by about inches, think big triangle. Stick one of those each side. You can then stick what ever you want over the split and sow it down. You might want to use a smaller needle than what comes with the speedy stitcher.

Vinyl would indeed be a bodge job, as vinyl stretches. But self-adhesive sail repair cloth or tape should do the trick, bearing in mind the alignment of the weave in the direction of the load.

I did say stick something over it and sow it down. The vinyl by itself there would probably work anyway. But it gives a good base to sow through without the risk of the monofilm splitting.