[Public-list] Deck Beam Repair Question - What is the load

Thu May 5 10:13:07 PDT 2005

If someone could supply rig weight and rig tensions I think you could get a
reasonable load estimate. If you add all the rig tensions and the weight of
mast you've got a conservative estimate of the vertical point load the mast
exerts on the beam.  The shroud tensions could then be used for the vertical
point loads on the ends of the beam. 

Mike
Rinn Duin #272

-----Original Message-----
From: public-list-bounces at alberg30.org
[mailto:public-list-bounces at alberg30.org]On Behalf Of Mike Lehman
Sent: Thursday, May 05, 2005 12:36 PM
To: public-list at alberg30.org
Subject: RE: [Public-list] Deck Beam Repair Question - What is the load

Austin,

The load varies with the conditions. I am not an engineer and I do not know,

or have I heard, that anyone has computed the maximum load on the beam. Carl

Alberg probably did and maybe Whitby did to determine the size of beam 
required. It is a good question. I will say this, however, a number of 
techniques have been tried over they years to reinforce the beam and the one

currently used, by sistering two aluminum plates, one to each side, was 
developed by the late Bruce Rankin who owned #244 and raced the boat hard. 
He was an engineer at the Naval Academy and his technique for this repair is

a permanent fix.

Mike Lehman
~~~_/)_/)~~_/)~~~

----Original Message Follows----
From: Austin Meyermann <somedaysailor2000 at yahoo.com>
Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
To: John Irving <a30blueteal at gmail.com>,Alberg 30 Public List -- open to all

<public-list at alberg30.org>
Subject: [Public-list] Deck Beam Repair Question - What is the load
Date: Thu, 5 May 2005 08:33:37 -0700 (PDT)

To all the engineers out there...

Has anyone ever calculated what the load is that is being delivered by the 
mast to the deck? I also would like to repair my deck beam but have a couple

of different ideas that are dependent upon knowing the forces.

Austin

John Irving <a30blueteal at gmail.com> wrote:
I just finished installing the aluminum sisters to strengthen the deck
beam. I followed the procedure described in the deck beam repair
article at:

http://www.alberg30.org/collaborate/moin.cgi/DeckBeamRepair

In the article, the writer says:

"Make sure that there is clearance from the top of the plate to the
underside of the deck, to avoid deck cracking when the beam flexes
under load. That space can later be filled with silicone caulking."

I'm wondering how much the beam will flex under load with the support
sisters in place. I have one small area about 4" long where epoxy
squeezed out over the aluminum plate filling the gap between the
aluminum plate and the underside of the deck. This area is directly
over the side edge of the starboard door frame in the forward cabin.
Should that be ground out?

Many thanks to those who posted the directions for the repair. It
turned out very well.

John
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