[Public-List] foredeck compression

Tue Jan 18 13:54:44 PST 2011

I'll be doing my Rekord Marine thing beside The Binnacle.

G

On 18/01/11 4:43 PM, "Richard Mair" <ramair49 at gmail.com> wrote:

> What will be your booth at the Halifax boat show
> Richard 609
> 
> On Tue, Jan 18, 2011 at 4:34 PM, Gordon Laco <mainstay at csolve.net> wrote:
> 
>> HI Roger -
>> 
>> I'm decompressing after the Toronto Show and gearing up for the Halifax one
>> in a few weeks....
>> 
>> With regard to your deck situation - you are on the right track with regard
>> to examining reasons to bolster the laminate around the bolt holes with
>> epoxy.  Yes, the column of solid goop will help somewhat but the main
>> reason
>> for the process is to make an dam around the bolts so that water can't get
>> at the soft core.  Be it balsa or masonite, moisture will cause a sharp
>> decline in its ability to cope with compression.
>> 
>> Now I'm going to read the jokes....
>> 
>> Gord
>> 
>> 
>> 
>> 
>> 
>> On 18/01/11 3:06 PM, "Roger L. Kingsland" <r.kingsland at ksba.com> wrote:
>> 
>>> Albergers,
>>> 
>>> I have read recommendations that, for high load deck hardware like
>> cleats,
>>> one should remove the inner part of the deck around the bolt holes and
>> fill
>>> with epoxy to improve the compressive strength of the deck.  I was
>> curious
>>> if this approach was appropriate for an A30.
>>> 
>>> I asked a materials testing guy I work with to test a 4" round section of
>>> good old 148's foredeck (3 layers of FG and 2 of Masonite, no moisture)
>> and
>>> it failed at 20,000 pounds per square inch.  It actually slipped in the
>>> press causing failure at the edge.  I suspect, had it been centered in
>> the
>>> press and failed uniformly, the pressure would have been much higher.
>>  The
>>> Masonite failed, not the fiberglass.  He also tested a piece of 1/2"
>> plywood
>>> which compressed to about half its thickness under the same load (with
>> lots
>>> of water squirting out in the process).
>>> 
>>> I looked up the clamp load (75% of yield strength) of a 3/8", 316, fine
>>> thread, SS bolt; it is 5,700 pounds (18-8 grade and course threads are
>>> less).  Assuming a big bow cleat needing 2-3/8" bolts at each end and a
>> 50%
>>> safety factor, the area of each base of the cleat (less bolt hole areas)
>>> would need to be 0.85 square inches or greater to prevent the bolt from
>>> collapsing the deck.
>>> 
>>> My conclusion (I am not an engineer but I sure like hanging out with
>> them,
>>> see Sidebar below to learn how to understand them better); it probably
>> isn't
>>> necessary to chop out a cavity in the deck and reinforce the bolt holes
>> with
>>> epoxy.
>>> 
>>> Best,
>>> 
>>> Roger 148
>>> 
>>> PS - Wife Jeanne and I drove from Pittsburgh on Jan 8 to attend the
>>> Chesapeake Bay Alberg 30 Association annual dinner.  What a great time we
>>> had.  We have only been to a few Alberg events but felt at ease and at
>> home
>>> with this lovely group of people.  We hope to attend again next year to
>>> discuss the river sailing characteristics of an A30 (seven years of on
>> the
>>> hard is probably long enough).  Thanks everyone for your hospitality.
>>> 
>>> 
>>> 
>>> Sidebar - Understanding Engineers
>>> 
>>> 
>>> Two engineering students were talking on a university campus when one
>> said,
>>> 'Where did you get such a great bike?'
>>> 
>>> The first engineer replied, 'Well, I was walking along yesterday, minding
>> my
>>> own business, when a beautiful woman rode up on this bike, threw it to
>> the
>>> ground, took off all her clothes and said, 'Take what you want.'
>>> 
>>> The second engineer nodded approvingly and said, 'Good choice; the
>> clothes
>>> probably wouldn't have fit you anyway.'
>>> 
>>> 
>>> Understanding Engineers - Take Two
>>> 
>>> To the optimist, the glass is half full. To the pessimist, the glass is
>> half
>>> empty. To the engineer, the glass is twice as big as it needs to be.
>>> 
>>> 
>>> Understanding Engineers - Take Three
>>> 
>>> A priest, a doctor, and an engineer were waiting one morning for a
>>> particularly slow group of golfers.
>>> 
>>> The engineer fumed, 'What' s with those guys? We must have been waiting
>> for
>>> fifteen minutes!'
>>> 
>>> The doctor chimed in, 'I don't know, but I've never seen such inept
>> golf!'
>>> 
>>> The priest said, 'Here comes the greens keeper. Let's have a word with
>> him.'
>>> He said, 'Hello, George! what's wrong with that group ahead of us?
>> They're
>>> rather slow, aren't they?'
>>> 
>>> The greens keeper replied, 'Oh, yes. That's a group of blind fire
>> fighters.
>>> They lost their sight saving our clubhouse from a fire last year, so we
>>> always let them play for free anytime.'
>>> 
>>> The group fell silent.
>>> 
>>> The priest said, 'That's so sad I think I will say a special prayer for
>> them
>>> tonight.'
>>> 
>>> The doctor said, 'Good idea. I'm going to contact my ophthalmologist
>>> colleague and see if there's anything he can do for them.'
>>> 
>>> The engineer said, 'Why can't they play at night?'
>>> 
>>> 
>>> Understanding Engineers - Take Four
>>> 
>>> What is the difference between mechanical engineers and civil engineers?
>>> Mechanical engineers build weapons and civil engineers build targets.
>>> 
>>> 
>>> Understanding Engineers - Take Five
>>> 
>>> The graduate with a science degree asks, 'Why does it work?' The graduate
>>> with an engineering degree asks, 'How does it work?' The graduate with an
>>> accounting degree asks, 'How much will it cost?' The graduate with an
>> arts
>>> degree asks, 'Do you want fries with that?'
>>> 
>>> 
>>> Understanding Engineers - Take Six
>>> 
>>> Three engineering students were gathered together discussing the possible
>>> designers of the human body. One said, 'It was a mechanical engineer.
>> Just
>>> look at all the joints.' Another said, 'No, it was an electrical
>> engineer.
>>> The nervous system has many thousands of electrical connections. ' The
>> last
>>> one said, 'No, actually it had to have been a civil engineer. Who else
>> would
>>> run a toxic waste pipeline through a recreational area?'
>>> 
>>> 
>>> Understanding Engineers - Take Seven
>>> 
>>> Normal people (particularly Albergers) believe that if it ain't broke,
>> don't
>>> fix it. Engineers believe that if it ain't broke, it doesn't have enough
>>> features yet.
>>> 
>>> 
>>> Understanding Engineers - Take Eight
>>> 
>>> An engineer was crossing a road one day, when a frog called out to him
>> and
>>> said, 'If you kiss me, I'll turn into a beautiful princess.'
>>> 
>>> He bent over, picked up the frog and put it in his pocket.
>>> 
>>> The frog spoke up again and said, 'If you kiss me and turn me back into a
>>> beautiful princess, I will stay with you for one week.'
>>> 
>>> The engineer took the frog out of his pocket, smiled at it and returned
>> it
>>> to the pocket.
>>> 
>>> The frog then cried out, 'If you kiss me and turn me back into a
>> Princess,
>>> I'll stay with you for one week and do ANYTHING you want.'
>>> 
>>> Again, the engineer took the frog out, smiled at it and put it back into
>> his
>>> pocket.
>>> 
>>> Finally, the frog asked, 'What is the matter? I've told you I'm a
>> beautiful
>>> princess and that I'll stay with you for one week and do anything you
>> want.
>>> Why won't you kiss me?'
>>> 
>>> The engineer said, 'Look, I'm an engineer. I don't have time for a
>>> girlfriend, but a talking frog, now that's cool.
>>> 
>>> 
>>> 
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>> 
>> 
>> _______________________________________________
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>> Please support them.
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>> 
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
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