[Public-List] Bend in the hull

[George Mathis]

My boat didn't have shelves OR shrouds for 16 years -- it sat on the hard with no hardware (not one bolt or screw) attached to it.
So I am not sure the "concavity" is due to "hard sailing". 
Interesting though. Hopefully the old girl will last another decade or so now that she's in the water!





> From: sail_505 at hotmail.com
> To: public-list at lists.alberg30.org
> Date: Wed, 12 Oct 2011 07:45:51 -0400
> Subject: Re: [Public-List] Bend in the hull
> 
> Stephen,
> 
> My boat #505 had the exact same thing. Most of the liner boats have this, 
> the ones that are raced hard in heavy winds are more pronounced. I decided 
> to fix mine. The cause is stress on the forward lower knee, but the shelf in 
> the forward cabin is a secondary structural member. You will note that this 
> shelf on the liner boats is pop riveted in place and does not provide 
> adequate support. I hate a pop rivet gun. I took the tension off the rig, 
> removed the forward lowers, removed the shelf and sanded the insides of the 
> hull where the shelf attached. Then I constructed a horizontal jack system 
> with 2x4s and pushed the hull back out to its original shape. With the hull 
> pushed out, I re-installed the shelf but glassed it back in place and 
> reinforced the knee at the same time. This provides the lateral support 
> needed to keep the hull from deflecting. I did this project 25 years ago and 
> the deflection has not returned despite some heavy weather sailing. A lot of 
> work and probably not necessary based on all of the other boats that have 
> never done this and do not seem to have any problems.
> 
> -----Original Message----- 
> From: Stephen Gwyn
> Sent: Tuesday, October 11, 2011 5:02 PM
> To: public-list at lists.alberg30.org
> Subject: [Public-List] Bend in the hull
> 
> Hi,
> 
> I've noticed that my hull has a slight concavity in the topsides,
> just below the forward lower shrouds. I've put two pictures up
> at:
> http://astrowww.phys.uvic.ca/~gwyn/pers/sailing/bend/index1.html
> (and yes the cove stripe needs repainting) I'm assuming it's due
> to the forward lowers pulling up on the fibre glass knee.  I
> think I can just barely see the same on the pictures recently
> posted by George Mathis at:
> http://alberg-boats.com/A30/439/09242011HomePort.jpg
> 
> Over 37 years, it's deflected by a 1/4 inch, so I'm only slightly
> worried.
> 
> Should I worry more?
> Has anybody else noticed the same thing?
> Should I do anything about it?
> 
> SG
> 
> 
> 
> ------------------------------------------------------------------
>   Stephen Gwyn                 |  Tel: 1-250-363-3136
>   Dept. of Physics & Astronomy |  Fax: 1-250-363-0045
>   Univ. of Victoria            |  Cell: 1-250-885-6969
>   PO Box 3055                  |  E-mail: gwyn at uvastro.phys.uvic.ca
>   Victoria, BC  V8W 3P6        |  http://orca.phys.uvic.ca/~gwyn
> ------------------------------------------------------------------
> 
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