[Alberg30] hull flexing

[John Birch]

Brian is absolutely right - all weight on the keel - the side pads should be at the bulkheads and be adjustable with no actual weight on them. The pads sole purpose is to keep the boat from toppling. The forefoot pad will need weight on it on the centreline to stop it from pitching forward - but that is the only one. The hulls are solid glass and some oil canning can be expected - remember the hull is at least 5/8" solid glass at the turn of the bilge and gets thicker closer to the keel.

John
  ----- Original Message ----- 
  From: Brian and Elaine Timmins 
  To: Alberg 30 public list 
  Sent: Wednesday, September 11, 2002 5:36 PM
  Subject: Re: [Alberg30] hull flexing


  In my experience, the boat should be sitting on her keel and the stands are only to keep her up right!
  Brian  ex#497
    ----- Original Message ----- 
    From: Mike Lehman 
    To: public-list at alberg30.org 
    Sent: Wednesday, September 11, 2002 4:19 PM
    Subject: Re: [Alberg30] hull flexing


    I experienced a similar problem with hull flexing, but on land. The yard put the aft jack stands in the wrong place and put to much weight on them. The result was "oil-canning" around the stands. I made them change the stands...when they wanted to charge me for blocking twice, I threathened to move them myself, we had an argument, they changed the stands, I did not get charged, I do not use that yard any more. The lesson is...when the boat is out for the winter, sight down the hull from bow or stern, and be sure she looks right, if not fix it.

    Mike Lehman 

    "Gilleleje" #505 
    "What is the use of a house if you haven't got a tolerable planet to put it on?" Henry David Thoreau 
    ----Original Message Follows---- 
    From: Gordon LACO 
    Reply-To: Alberg 30 public list 
    To: Alberg 30 public list 
    Subject: Re: [Alberg30] hull flexing 
    Date: Wed, 11 Sep 2002 00:48:28 -0400 
    on 9/11/02 2:26 PM, Dave Terrell at DTERRELL.GWSTAFF.GWNMC at message.nmc.edu 
    wrote: 
    the hull number is 432. the head door does not stick. The bulk heads appear 
    to be securely attached to the inner liner. The deck beam appears to be have 
    been originally encapsulated in fiberglass. If not the fix job was very good 
    and professional. What I am noticing is a flexing of the hull below the 
    waterline sometimes when I encounter a larger wave. 
    >>> gdinwiddie at alberg30.org 09/10/02 05:07PM >>> 
    Dave, 
    You don't say what hull number boat you have. If you have a wooden 
    beam, is it in good shape or starting to sag? If a newer boat, does the 
    head door stick on the overhead? 
    Are your bulkheads still attached tightly all around? 
    Everything flexes a little, but the A30 is a pretty stiffly built boat. 
    What specifically are you noticing? 
    - George 
    Dave Terrell wrote: 
    > 2. I notice that the hull on my boat flexes when I hit a wave sometimes. 
    > Is this normal? I am not sure it is consistent with the A30's reputation 
    > as a s olidly built boat. Am I missing something or do I need to reshape 
    > my thinking on this matter? 
    Hi guys - 
    I have A30 #426 and she exhibits hull flexing as well. The problem is that 
    our boats were heavily glassed up but with no core material in the hull. 
    This means that they are not as stiff as they might be; but on the positive 
    side there is no chance of water destroying the hull via water rotting the 
    core as we get in decks. 
    It is a bad idea to try to bolster the hull with interior stiffening as it 
    is very easy to create hard spots that the hull can then crack around. Best 
    just live with it. 
    Gord Laco 
    Sojourning in Mexico at Fox Studios 
    A30 #426 Surprise 


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