Contact   Imprint   Advertising   Guidelines

How to fix strut blow out

Forum for kitesurfers
DariKite
Rare Poster
Posts: 41
Joined: Sun Jan 28, 2018 11:49 pm
Kiting since: 2018
Gear: Kite: 12mt Liquid Force WOW ; 9mt Cabrinha SwitchBlade
Board: Cabrinha Ace ; Wainmann Hawaii Passport 5'7" ; F-One Mitu Pro Convertible 2016 (Hydrofoil/Surf)
Brand Affiliation: None
Has thanked: 8 times
Been thanked: 2 times

How to fix strut blow out

Postby DariKite » Mon Mar 08, 2021 5:44 pm

Could anyone tell me what the best way is to fix this? I'm not sure what I did wrong when I installed it and it blew out.

I cut out the stretched PU and was thinking to glue a new PU patch inside the strut with Aquaseal. And then apply a patch of Tear Aid on top.

The problem is that the hole is really close to the seam (less than 1cm) and that may lead to leaks. Thoughts?
Attachments
IMG-6052.jpg
IMG-6063.jpg
IMG-6055.jpg

User avatar
foam-n-fibre
Frequent Poster
Posts: 479
Joined: Tue Jan 02, 2007 11:50 pm
Gear: DIY boards and OR kites
Brand Affiliation: None
Location: Ottawa, Canada
Has thanked: 1 time
Been thanked: 5 times

Re: How to fix strut blow out

Postby foam-n-fibre » Mon Mar 08, 2021 6:31 pm

Someone might be able to tell you better about the repair there, but what went wrong is that the bladder was pulled in by the valve and the front end was folded over. If it was more slippery with talc powder, that would have helped. When the bladder was 90% full of air with no pressure you can stop pumping and manipulate the thing to work the folded bladder out. Better still, before you pull the bladder into the kite, turn the front of the bladder inside out. As in push it down into the rest of the bladder. When you pump the bladder it will fill and roll outward into the right place with no p[inched folds.

For any repair make sure you lightly rough the surface, and even more important, wipe it with rubbing alcohol or the bond will fail. With a top quality aqua seal bond near the seam I would expect it will seal OK

Peter

DariKite
Rare Poster
Posts: 41
Joined: Sun Jan 28, 2018 11:49 pm
Kiting since: 2018
Gear: Kite: 12mt Liquid Force WOW ; 9mt Cabrinha SwitchBlade
Board: Cabrinha Ace ; Wainmann Hawaii Passport 5'7" ; F-One Mitu Pro Convertible 2016 (Hydrofoil/Surf)
Brand Affiliation: None
Has thanked: 8 times
Been thanked: 2 times

Re: How to fix strut blow out

Postby DariKite » Mon Mar 08, 2021 7:05 pm

foam-n-fibre wrote:
Mon Mar 08, 2021 6:31 pm
Someone might be able to tell you better about the repair there, but what went wrong is that the bladder was pulled in by the valve and the front end was folded over. If it was more slippery with talc powder, that would have helped. When the bladder was 90% full of air with no pressure you can stop pumping and manipulate the thing to work the folded bladder out. Better still, before you pull the bladder into the kite, turn the front of the bladder inside out. As in push it down into the rest of the bladder. When you pump the bladder it will fill and roll outward into the right place with no p[inched folds.

For any repair make sure you lightly rough the surface, and even more important, wipe it with rubbing alcohol or the bond will fail. With a top quality aqua seal bond near the seam I would expect it will seal OK

Peter
I did what you said about folding the bladder inside out above the valve. When I pumped it, it would not inflate above the valve. Maybe it got stuck in the valve like you said. Then I was able to inflate it above the valve but there was a crease somewhere in between. I thought that crease was normal as many kites have a similar crease on the strut near the LE. But when I touched there to feel it, it blew out. I think the talcum powder would have helped but I should have done the procedure all over again (remove and reinsert strut) since I was in doubt. Better to be safe than sorry.

kitexpert
Very Frequent Poster
Posts: 1069
Joined: Sun Aug 09, 2015 11:20 pm
Gear: many kites, also diy
Brand Affiliation: None
Has thanked: 23 times
Been thanked: 45 times

Re: How to fix strut blow out

Postby kitexpert » Mon Mar 08, 2021 8:03 pm

Cutting stretch area off makes it only worse, then there is also a big hole in bladder. What you need to do is to press stretched area down and use some thin tape strips to keep it flat. You have to find flat edge of the damaged area and use big enough patch to cover it with a reasonably margin - that is the part you'll have a critical glue seam.

Before glueing both bladder and patch have to be flat. So bladder must be taped to some flat board or table and also patch (from the edges) to some piece of cardboard or even better to transparent sheet of thin plastic. Whole area can be glued and then pressed firmly, rolling with a roller tool is also useful.

If damage is near edge patch is best to reach to the other side. Then it is a two stage fix, one side at the time.

Repair tape works well for smaller damages but you cant put several layers or it will fail. Using iron for hot seaming is also possible but not in all cases.
These users thanked the author kitexpert for the post:
Guigassa (Wed Apr 14, 2021 1:17 am)
Rating: 6.67%

DariKite
Rare Poster
Posts: 41
Joined: Sun Jan 28, 2018 11:49 pm
Kiting since: 2018
Gear: Kite: 12mt Liquid Force WOW ; 9mt Cabrinha SwitchBlade
Board: Cabrinha Ace ; Wainmann Hawaii Passport 5'7" ; F-One Mitu Pro Convertible 2016 (Hydrofoil/Surf)
Brand Affiliation: None
Has thanked: 8 times
Been thanked: 2 times

Re: How to fix strut blow out

Postby DariKite » Wed Mar 31, 2021 2:23 am

Update: a friend and I were able to repair it by stretching out flat the bladder, applying an internal layer of bladder patch (no glue) and on top applying a Tear Aid patch right to the edge.
These users thanked the author DariKite for the post:
Matteo V (Wed Mar 31, 2021 2:48 am)
Rating: 6.67%

Matteo V
Very Frequent Poster
Posts: 2635
Joined: Mon Mar 20, 2017 3:42 pm
Local Beach: US, Iowa/Nebraska/Kansas/Utah/Oregon Coast
Favorite Beaches: Ft. Stevens, North coast of Oregon
Style: Just like school in summertime
Gear: Delta Kites and LF Kitefish QuadMod
Snowboard (Cambered and Rockered)
Foil kites on the snow
Brand Affiliation: NONE F--- the corporate world
Has thanked: 216 times
Been thanked: 234 times

Re: How to fix strut blow out

Postby Matteo V » Wed Mar 31, 2021 2:50 am

DariKite wrote:
Wed Mar 31, 2021 2:23 am
Update: a friend and I were able to repair it by stretching out flat the bladder, applying an internal layer of bladder patch (no glue) and on top applying a Tear Aid patch right to the edge.
Thanks for the update, that is valuable info on the internal patch. I've been using sticky patches internally and that is a total pain!

windmaker
Very Frequent Poster
Posts: 1810
Joined: Sun Jun 15, 2003 8:48 am
Local Beach: .
Style: Strapless surf and foil
Gear: F-One & Aeros kites/ HB surf/ Taaroa foil/ Manera
Has thanked: 38 times
Been thanked: 61 times
Contact:

Re: How to fix strut blow out

Postby windmaker » Wed Mar 31, 2021 6:04 am


CanadianGringo
Rare Poster
Posts: 43
Joined: Tue Jul 05, 2016 2:16 pm
Local Beach: Northern Ontario Lakes
Great Lakes
Favorite Beaches: Lake Simcoe
Squamish
Crescent Beach NS
The Gorge
Style: Freeride
Gear: Naish/Cabrinha
Brand Affiliation: None
Has thanked: 4 times
Been thanked: 0

Re: How to fix strut blow out

Postby CanadianGringo » Sun Apr 11, 2021 11:33 am

You should consider buying a replacement strut now online.
Personally I don’t like flying kites with repairs.
To avoid getting stranded - etc.

User avatar
edt
Very Frequent Poster
Posts: 6028
Joined: Fri Jul 16, 2010 6:27 am
Kiting since: 2010
Local Beach: Michigan
Gear: slingshot liquid force wainman pansh naish duotone cwb burton ronix ozone cabrinha north flysurfer
Has thanked: 153 times
Been thanked: 195 times

Re: How to fix strut blow out

Postby edt » Sun Apr 11, 2021 11:49 am

I always fix blow outs like that. Grab a roll of tear air type 1 and start taping. I never use talcum powder because microscopic particles bond to the polyurethane and make future repairs difficult as nothing sticks.


Always always always blow up at half pressure. Check everything. Deflate. Then pump it up for real. Never pump a recently repaired strut or leading edge up to full pressure immediately. That's how you get blowouts

I cut away the stretched out part and use as much tear aid as required. Properly repaired it will be as strong as a brand new strut

Sounds like you have a good repair

If you need several layers of tape you have to run a bead of aquaseal along the edge of the tape as said above double layers of tape won't seal properly on their own.

I was never able to get the hot weld technique to work so I just use aquaseal on problem areas
These users thanked the author edt for the post:
Guigassa (Wed Apr 14, 2021 1:16 am)
Rating: 6.67%

User avatar
Gigi;)
Very Frequent Poster
Posts: 535
Joined: Wed Jan 12, 2005 7:23 pm
Location: drtuba.eu, kite-stuff.org, eXtremist.si, kajtar.si
Has thanked: 0
Been thanked: 7 times
Contact:

Re: How to fix strut blow out

Postby Gigi;) » Sun Apr 11, 2021 1:43 pm



Return to “Kitesurfing”

Who is online

Users browsing this forum: Bing [Bot], Google [Bot] and 85 guests