[Public-List] Bend in the hull

[Mike Lehman]

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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