Ok, how about "unpredictable". Sure, you can make reasonable estimates.
Then some guy with big eyes and small brain decides to set a new air speed
record off the top of a wave, only to slam into a BIG wave right after. If
you could guarantee prudent use, you might be able to better estimate loads.

Brian

"Schöön Martin" wrote in message
...
"Brian D" writes:

It's important to note that the remarks made about structural
calculations
are accurate, but also note that boats are subject to unknown forces.

Unknown forces?
Like ESP or telekinesis or "may the force be with you"?

Sorry, I just couldn't resist :-)

But also, there are no such unknown forces IMHO.

snip
not surviving etc). If I were you, I'd go ahead and buy the books that
apply, read them, then decide how far you want to take it...the training
and
education or the design work itself. Armchair sports or playing the
game.

Right and if you feel intimidated by the math and physics you'd better
stay away from it.

Brian

--
My boat project: http://www.advantagecomposites.com/tongass

Go to http://www.multihulls.org/boats/scarlatti/scmain.htm for something
completely different. Please visit the "Technical" section (link at the
bottom) for a very incomplete discussion. Material on structural
engineering will be added as time permits.

Cheers,

--
================================================== ======================
Martin Schöön

"Problems worthy of attack
prove their worth by hitting back"
Piet Hein
================================================== ======================

Brian D wrote:

Ok, how about "unpredictable". Sure, you can make reasonable estimates.
Then some guy with big eyes and small brain decides to set a new air speed
record off the top of a wave, only to slam into a BIG wave right after. If
you could guarantee prudent use, you might be able to better estimate loads.

Brian


That's not a unpredictable load, but an unacceptable OVER-load.

It's _supposed_ to break then.

It it doesn't break then, it's built too heavy.


Richard

Martin says:

Oh, I am sorry for having disapointed you. I'll give it a better try
next time :-)

Not your fault, Martin - you threw the gauntlet, no-one bothered to pick it up.
;-)

Steve "doesn't _really_ enjoy flame wars"

Richard Lamb ) writes:
Brian D wrote:

Ok, how about "unpredictable". Sure, you can make reasonable estimates.
Then some guy with big eyes and small brain decides to set a new air speed
record off the top of a wave, only to slam into a BIG wave right after. If
you could guarantee prudent use, you might be able to better estimate loads.

Brian


That's not a unpredictable load, but an unacceptable OVER-load.

It's _supposed_ to break then.

It it doesn't break then, it's built too heavy.

a boundry value problem?

the theory of convex hulls is an optimization method in the mathematics of
descision making. thus proving mathematicians are wannabe boat builders
like everybody else.

--
------------------------------------------------------------------------------
William R Watt National Capital FreeNet Ottawa's free community network
homepage: www.ncf.ca/~ag384/top.htm
warning: non-freenet email must have "notspam" in subject or it's returned

"Brian D" writes:

Ok, how about "unpredictable". Sure, you can make reasonable estimates.
Then some guy with big eyes and small brain decides to set a new air speed
record off the top of a wave, only to slam into a BIG wave right after. If
you could guarantee prudent use, you might be able to better estimate loads.

Brian

Right, not even the safest of cars (Volvo?) survive being driven off
a cliff.

Then you have the racing crowd who do things normally not regarded as
prudent...

http://www.multihulls.org/clublinks.html
that kind of sailing isn't regarded as particularly wild. It's a
5 tonne boat, 60'x60' on the water.

Another one: http://www.bonduelle.fr/htm/voile/fdecran/1024/01.jpg
and http://www.zedda.com/news_details.php?ID=37#
but these two does not represent severe load cases (flat water).

I have seen wilder things but don't seem to be able to locate them
again.

Cheers,

--
================================================== ======================
Martin Schöön

"Problems worthy of attack
prove their worth by hitting back"
Piet Hein
================================================== ======================

Sigh ...some things are best just watched from comfortable spectator
seats...

"Schöön Martin" wrote in message
...
"Brian D" writes:

Ok, how about "unpredictable". Sure, you can make reasonable estimates.
Then some guy with big eyes and small brain decides to set a new air
speed
record off the top of a wave, only to slam into a BIG wave right after.
If
you could guarantee prudent use, you might be able to better estimate
loads.

Brian

Right, not even the safest of cars (Volvo?) survive being driven off
a cliff.

Then you have the racing crowd who do things normally not regarded as
prudent...

http://www.multihulls.org/clublinks.html
that kind of sailing isn't regarded as particularly wild. It's a
5 tonne boat, 60'x60' on the water.

Another one: http://www.bonduelle.fr/htm/voile/fdecran/1024/01.jpg
and http://www.zedda.com/news_details.php?ID=37#
but these two does not represent severe load cases (flat water).

I have seen wilder things but don't seem to be able to locate them
again.

Cheers,

--
================================================== ======================
Martin Schöön

"Problems worthy of attack
prove their worth by hitting back"
Piet Hein
================================================== ======================