[Public-List] Henry Ford invention

Thu Jan 7 09:34:18 PST 2010

Sorry to go off topic but, with all the snow we have been having (I hate
global warming), I thought you might have some interest in getting one of
these.

http://forum.treasurenet.com/index.php/topic,213971.0

Roger 148 

Roger Kingsland, Managing Partner
Kingsland Scott Bauer Associates

KSBA 
________________________________

Architects/Planners/InteriorDesigners/ProjectManagers

3441 Butler Street
Pittsburgh, PA 15201
N 40° 27.8344'  W79° 57.9831'

412-252-1500 ext.101 
412-779-5101 cell 
412-252-1510 fax
r.kingsland at ksba.com
www.ksba.com

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Roger L.
Kingsland
Sent: Thursday, January 07, 2010 12:25 PM
To: 'Alberg 30 Public List -- open to all'
Subject: Re: [Public-List] mast beam repair

Michael,

Even though you have made up your mind based on sound personal logic, I feel
compelled to join the choirs of "alternativers".  

In wood framing, when a long span is required, we will sometimes specify
double 2x10s with a steel "flitch" plate in between; all bolted together.
Its allot stronger than double 2x10s and employs mechanical (bolts)
connections rather than chemical (glue).  If you are going to the trouble of
removing and relaminating the beam,  you could also cut it in half at the
centerline (vertically along its length, of course), throw in an aluminum
flitch plate and bolt everything together.  The aluminum would take up most
of the bending load while the entire assembly would prevent twisting.  With
the exception of the bolts, no one would know you were "cheating".

You could also do a similar deal with several layers of fiberglass, or even
carbon fiber, instead of aluminum.  I would still bolt everything together
though so the owner of good old #133 won't have to do the job again in 2053
because the chemical connections failed.

Have fun with your project.

Roger 148      

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Bill Wallace
Sent: Thursday, January 07, 2010 11:05 AM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] mast beam repair

I'm not totally sure about the stress on the mast beam, but I think it would
be sheer - a force applied on the deck on top of a couple of the beams would
push them down more than the other beams, thus applying a sheer force -
regardless, long term applied sheer or tension is hard on non-reinforced
plastics.  On the dinghy, there are a few places where screws are used to
keep the joint under compression - this is for a joint without fibreglass.
Fibreglass changes the mix as long as the stress is along the fibres - that
is why you can pull the tabbing apart as it is a straight glue joint, but
once you adding the slots, the fibreglass takes the stress.  I haven't done
my deck beam, and can't even see it so this is all based on other
epoxy/fibreglassing I've done.

Bill

----- Original Message ----
From: Rachel <penokee at cheqnet.net>
To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org>
Sent: Thu, January 7, 2010 10:05:58 AM
Subject: Re: [Public-List] mast beam repair

On Jan 7, 2010, at 9:21 AM, Bill Wallace wrote:

> Even Epoxy glue joints fail for things like tabbing and gluing things 
> in
sheer.  For tab joints, the recommended solution is to use slots cut through
the material, and strips of fibreglass.  Don Casey's book This Old Boat (2cd
version) has a picture in it of how to do this.  I would guess that just
wrapping the entire beam in 3 places with 3" fibreglass would work well.

Wouldn't the beam laminations themselves be in tension though, not sheer?

I can agree that there is a "peeling" type force on the tabbing, but if the
beam does not sag or move, then I don't see why that peeling force would be
any more pronounced than that which is on all of the other tabbing in a boat
(bulkheads, etc.).   Most of the force in this case wouldn't be a peel force
either, to my mind.  Unless I'm missing something (?)  (I'm not a
physicist.)

Rachel
ex #221
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