DSK wrote:

The navigator© wrote:


Yes, repeatability is the whole issue.


Why?

Repeatability is always an issue when measuring things,

yes that's why.


but is there some
specific reason why a boats rigidity should be uniform & consistent? To what
standard should it be?



.... Once again you reveal your lack of experience with big
boats by suggesting otherwise.


Really? Is it you that's been following me around all my life? Maybe you can
really tell me how many big boats I've sailed, I never did keep a written tally
myself.


Of course not.

....This typifies your inability to grasp
even simple ideas.


You mean like how to measure things?


As for measurent of a boat to 5 thou, look at the coefficent of
expansion of say GRP or even Al (which expands muchg less) and then tell
me how much a boat moves during a typical day/night temperature cycle.


Why is that an issue? BTW did you miss the thread about how much an aluminum mast
expands or contracts due to temp variation?


Now you want to tell me it's easy to measure a 5 thou deflection over a
40' boat?


Sure is. All you need is a yardstick slightly longer than the boat.

Yardstick. Riiiiight.


Even if the boat builder had access to interferometric
equipment (which I'm sure they did not use


Now you're claiming you were there? How do you know what they used?


Want to put money on it? Let's email them.

.... -as there would be no point
in such an accurate measurement) it would still be hard.


Not really, if you know how.


The usual pompous DSK response that hints at knowlege where there is none.


My point is that Ella is not a large racing boat and yet still has more
than 1 ton rig tension.


Umm, Navvie©..... did you think that the terms '1-Ton' and the like refer to the
rig tension carried by the boats of this particular class?

An you accuse me of introducing irrelevancies. Or are you confused as to
what a 1 ton class is? Let me guess -you think 1 ton class boats weigh 1
ton -quick off to the web and check little Doggie!


BTW the specific boats I had in mind, which had aluminum struts forming a big
truss inside, were 'IMP' (designed by Ron Holland IIRC) and 'Ydra' (which was a
German entry in the Admirals Cup IIRC) and the Canada's Cuppers which I already
mentioned. Ben Lexcen (Bob Miller) designed at least one boat with the same type
structural elements.

So now you've found out it's a truss (a truss here is not a medical
support Doug). Yes, that is correct and trusses were used quite widely.
They still are in some cases around highly loaded points.

Now, lets go back to your original statement which I said was BS. Let me
remind lest you think you've moved goal posts and escaped. You said:
"At one point FROM the late 1970s THROUGH MAYBE the late 1980s it was
fairly common to have a GEODESIC GRID of aluminium struts inside,
COMPLETELY OBSTRUCTING THE CABIN."

The caps are to highlight the BS. Completely obstructing the cabin?

Bwhahhahaha. BULL**** EXPOSED.



Do you still think it's all BS? Will you never learn?

But I think you've confirmed I seem to know more about boat design and
construction than you. So what am I supposed to learn from you, the art
of BS?

Cheers MC