Harry Krause wrote:
K Smith wrote:



Wood is not a very strong material at all.


Bull****. Wood is a very strong material when used appropriately.

Not according to any rational analysis. It's cheap & renewable to some
extent & still has some traditional uses but in actual structural
situations it's about the worst choice. However you are certainly
entitled to put your opinion, just so long as you don't deny me the same
right.




Tougher hardwoods have very

moderate strength in compression, but other than that wood is a very
weak material with low resistance to flexing & even worse performance in
tension. i.e. bend a piece of wood to simulate a load in the middle; one
side is in compression & the other is in tension.



Yeah? Tell you what. Envision a wood stringer, say 2"x10"x16'. Tip it on
its edge. Now, try to bend it in the up or down plane with any load
similar to what you might find in a working hull. Now, build that 2x10
into an eggcrate sort of structure, with cross members of the same or
similar material. Now subject that structure to lateral loads. Doesn't
bend that way either.

This is real world construction here, Karen, not some crap you lifted
off a web site.

Gee now if only websites could give some understanding I could lead you
to one, however you are just babbling because it's me delivering the
news, sorry don't shoot me I'm just the tea girl delivering the mail.




The wood will bend

easily & a great deal, it will usually then break as the tension side
fails. So I'd like to submit the problem with wood is that it's wood.



The problem isn't wood in boats. It is the wood between your ears.

Dear dear dear you can't help yourself, tell you what why don't you
make up a lie about how you're a structural engineer & specialise in
these things, or how about the jetski lie, this time what?? you won a
hammer & nail in a raffle???





Most anything designed in wood is strength for strength much much
heavier than almost any other material, steel, glass, even ferro. This
is because the material is inherently weak & this weakness is aggravated
by the difficulties of attaching it to anything, even itself (mechanical
fastenings, nuts & bolts are about the only real fix)



Really? Gosh. There probably are 100 million wood frame houses in the
united states, some more than 100 years old. I suppose that because of
the weakness of wood and the difficulties of attaching it to anyting,
even itself, are really problematical, eh?

Gees louise you really think a house frame is the same thing??? You
have no concept do you, try picking a wooden house up say 4ft by one
corner then drop it as you pick the opposing side up the same 4 ft.
You'll have barbie fuel for longer than it would take for you to tell
the truth about the time. Timber house bearers weight almost as much as
the highest loads they're ever likely to see & again if you stopped &
thought about things you'd realise whenever timber is used as a
structural load bearing materieal it's in compression, never in tension,
because in tension it will fail usually where the tension force is
applied. Boats aren't static they get constantly attacked by forces from
all angles, not to mention the regular tangles with a wharf or sandbar
at varying speeds.




It might be a "normal" process when you glass over wood because resins
will not ever properly bond to wood


You ought to send your resume to Grady-White. I'm sure they'd be
interested in hiring you because in your opinion, the boats they build
are likely to fall apart any moment; their stringers are constructed of
XL plywood covered in fiberglass.

But what could Grady-White know about boat=building, compared to the
Australian bull**** artist, Karen Elizabeth Smith?

Gee now there's a killer rejoinder, some people still use wood
therefore wood must be good??? Harry if you had any education whatsoever
you'd never come out with these childish arguments.




I'd like to also disagree with this if I may. Hollow sections are never
as strong as three dimensional webbed or bulkheaded sections. i.e. say
in steel a rolled hollow section (RHS) of a given weight is never as
strong as as a universal column (RSJ) of the same weight.


An important principle to keep in mind when building small boats, eh?

Yep absolutely if you can understand the general principles of how
materials are used you can use that in all sorts of innovative new ways,
do you want a link to the rec boats page for a classic example??



More Karen lifts from engineering webpages, but no understanding of
materials or applications.




Harry that was just a quick off the cuff answer to what I saw as a
sweeping statement about cored beams which I tried to counter & actually
explain why I disagreed. It's no surprise you can't understand it but as
with so many other things here at least I've tried.

As for the rest of your comments I guess all I can say is tell me where
I can even see let alone inspect other reasonable HP diesel OB motors, I
mean even Yanmar gave up at 40 HP so till you find the latest diesel OBs
in the same HP range as mine ............ The boat?? yep; she's old &
yes she works for her keep but it's my boat independently verifiable to
anyone, which is more than can be said of you or your made up fantasy boats

K



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