First major problem with Zip build

Designs for inboard or outboard power

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JasonQ
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First major problem with Zip build

Postby JasonQ » Sun Apr 23, 2017 10:19 am

I have my first major problem with my build. Last night when I was glueing my stbd shear lamination I heard a crack. My port shear lamination cracked about a foot from the stem. It was glued on last week. You can see it in the picture below. I am not sure how I should go forward with this. I think most of the crack area will be faired off? Any help is appreciated.
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Bill Edmundson
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Re: First major problem with Zip build

Postby Bill Edmundson » Sun Apr 23, 2017 10:46 am

Jason

DAMN :!: I hate that noise! Laminate some more material on the inside of the shear. Tape up the crack the best you can and try to fill with in-thickened epoxy. I need to look. I think I have some syringes. It's not the first time it has happened. Actually that is a pretty good place for it to happen. There is not a lot of load there.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

JasonQ
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Re: First major problem with Zip build

Postby JasonQ » Sun Apr 23, 2017 11:34 am

Thanks Bill! I will give that a try once I free up some clamps. You can never have enough clamps! Should I add material all the way from frame 5 1/2 to the stem?

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Bill Edmundson
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Re: First major problem with Zip build

Postby Bill Edmundson » Sun Apr 23, 2017 11:42 am

Jason

I think, I remember talking with you. I think I'd reinforce that whole section. My wife grew up in Trussville, and I grew up in Irondale.

I know the Zip calls for a 1/4" bottom. But, I have 3 1/2 sheets of 3/8" I'll make you a deal on.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

JasonQ
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Re: First major problem with Zip build

Postby JasonQ » Sun Apr 23, 2017 11:50 am

What type of ply is it?

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Bill Edmundson
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Re: First major problem with Zip build

Postby Bill Edmundson » Sun Apr 23, 2017 11:56 am

Jason

It's BS1088 Meranti.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

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vupilot
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Re: First major problem with Zip build

Postby vupilot » Sun Apr 23, 2017 12:03 pm

Wow, I dont think Ive seen a laminated sheer crack on a Zip before. Usually only happens when you try to bend a solid one piece sheer. Not a major problem though it seems like it would be. Since you have the good laminated piece behind it I dont think its a huge deal. Like Bill said,..Inject epoxy in the crack as much as a you can, back the the good piece like Bill suggested on the inside and youll end up fairing away much outside piece that cracked later anyway. An extra piece and an hour to repair and youre back moving forward!

JasonQ
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Re: First major problem with Zip build

Postby JasonQ » Sun Apr 23, 2017 12:18 pm

Thanks vupilot! You have the YouTube video with the Jimmy Buffett song? I have watched that one several times.

BillW
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Re: First major problem with Zip build

Postby BillW » Sun Apr 23, 2017 1:24 pm

I would suggest adding another inside lamination on BOTH sides of the boat in that area. From the breasthook to the frame.

No particular reason, it just seems like the thing to do. Easy to do. Keep it symmetrical.

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vupilot
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Re: First major problem with Zip build

Postby vupilot » Sun Apr 23, 2017 3:53 pm

Yep, thats me. Also, sorry to bum Bill out but I dont think I would do a 3/8" bottom. I had a heck of a time just getting the 1/4" to bend along the stem. I cant imagine trying to bend 3/8" for that.

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Bill Edmundson
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Re: First major problem with Zip build

Postby Bill Edmundson » Sun Apr 23, 2017 4:12 pm

Chris has built this boat. So, I yield to him. I built the Bartender, which is a much larger boat. Bending 3/8" ply was no joy! Seats and decking would probably be ok.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

joshuab
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Re: First major problem with Zip build

Postby joshuab » Mon Apr 24, 2017 12:43 pm

JasonQ wrote:Thanks vupilot! You have the YouTube video with the Jimmy Buffett song? I have watched that one several times.



Me too, I've had it on repeat for almost three years :lol: :lol: :lol:
I cut twice and it's still too short :mrgreen:

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Andy Garrett
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Re: First major problem with Zip build

Postby Andy Garrett » Mon Apr 24, 2017 10:44 pm

Stupid question:
The break looks pulled apart.
Was this laminated, then bent, or or bent one lam at a time?
Andy Garrett

Perhaps the slowest Zip build in Glen-L history...

JasonQ
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Re: First major problem with Zip build

Postby JasonQ » Tue Apr 25, 2017 8:27 am

Andy,

They were bent one at a time. It actually broke several days after it was glued when I was laminating the opposite side.

JimmY
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Re: First major problem with Zip build

Postby JimmY » Tue Apr 25, 2017 9:12 am

Just make sure to measure from each sheer to the centerline of the boat so that it is symmetrical. From the photos, it looks like the cracked sheer will not bow out as much as the other side, so you may end up scabbing on a filler piece to the outside as well to get them to match.
-Jim
Nothing says poor craftsmanship like wrinkles in your duct tape!


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