Messed up when laminating transom knee

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planetk
Posts: 7
Joined: Sat Feb 01, 2014 10:49 am
Location: Bremen, Germany

Messed up when laminating transom knee

Postby planetk » Wed Feb 25, 2015 11:09 am

Hi all,

after pausing my project of building a malahini (http://www.glen-l.com/phpBB2/viewtopic.php?t=25533) for almost a year now, I’m back to business and right at the weekend I started with a huge mess.

When laminating the transom knee with thickened epoxy, I missed to fasten one of the screws.

So there is a small gap between the 2 Boards not filled with epoxy. It is about 1/16 inch wide, 3 inches long and
1/2 inch deep. It’s located at the lower outer edge of the knee.

You may have a look here:

http://holzboot.blogspot.de/2015/02/fehler-beim-laminieren.html

I am not sure how to proceed, since I am running low on the thick plywood and I have to buy full boards.

The knee feels very stiff and there is no sort of movement possible. Since I’m using thicker plywood
my laminated knee is about 20% thicker than if I would have build it from 3/4“ Plywood. I'm planning to power the boat
with a 70HP Motor and laminate the transom to about 2 1/4" thickness.

All in all I’m tending to fill the gap with some epoxy and leave it as it is. Possibly I would support the transom with 2 small „knees“
attached to the battens.

Does all this sound reasonable, or is there a high risk of failure? I really need your expertise here and any kind of hint would be really great!

Tank you so much in advance!
My blog about building the Malahini http://holzboot.blogspot.de

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steveh41
Posts: 629
Joined: Mon Jun 14, 2010 7:16 pm
Location: Catheys Valley, CA
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Re: Messed up when laminating transom knee

Postby steveh41 » Wed Feb 25, 2015 2:45 pm

Your plan to fill the gap with epoxy should work fine. Just make there is no debris or other loose material which might interfere with the bond. The epoxy is quite a bit stronger than the wood. Have a few such gaps in my own build & I'm sure there are many who have had similar issues.

Good luck with your build!

Regards,

Steve Hansen
The longest journey begins with a single step… then repeat as necessary!

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Roberta
Posts: 6040
Joined: Tue Jul 31, 2007 5:23 pm
Location: East Troy, Wisconsin

Re: Messed up when laminating transom knee

Postby Roberta » Wed Feb 25, 2015 3:42 pm

That happens once in a while. Dam it up with tape and pour in the thin epoxy. It'll be fine.

Roberta :D :D
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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Andy Garrett
Posts: 1279
Joined: Tue Aug 31, 2010 11:44 pm
Location: Nampa, Idaho

Re: Messed up when laminating transom knee

Postby Andy Garrett » Fri Feb 27, 2015 11:10 am

Get used to these kinds of things. Building a boat is a long series of 'fixes'.

The book and plans give the 'ideal' outcome--sort of 'best practice'. Reality dictates that errors happen, and there is a margin for them as long as they are intelligently dealt with.
Andy Garrett

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

planetk
Posts: 7
Joined: Sat Feb 01, 2014 10:49 am
Location: Bremen, Germany

Re: Messed up when laminating transom knee

Postby planetk » Sat Feb 28, 2015 1:07 pm

Thank You very much for all the help. Ill try to use fill the gap with epoxy as you told.
Really good to know that I can find such friendly and competent help here!

Thanx a million!
My blog about building the Malahini http://holzboot.blogspot.de


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