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zippyRN View Drop Down
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Posts: 437 		Post Options Post Options   Quote zippyRN Quote  Post ReplyReply Direct Link To This Post Topic: Those laws of physics you lot love to..
    Posted: 01 Oct 17 at 11:36am
Originally posted by Riv

I keep in mind George Box's (statistician) quote when thinking about lift:

"all models are wrong, but some are useful"

not far off it ... 

nearly  all the science  to do with  boats and ships is  application of the least worst model 
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Riv View Drop Down
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Posts: 353 		Post Options Post Options   Quote Riv Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 17 at 9:56am
I keep in mind George Box's (statistician) quote when thinking about lift:

"all models are wrong, but some are useful"
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Rupert View Drop Down
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 10:45pm
The way I do maths, mainly on my fingers, means pretty much any answer is possible, barring, perhaps, the right one.
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423zero View Drop Down
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 9:34pm
Mathematics itself is a consistent, logical system and does not require repeated experimentation to affirm something with certainty only approaching, but never reaching 100%. Any valid proof will give you perfect certainty of a mathematical fact, forever.

On the other hand, the way we do mathematics is empirical. Take the question of whether we can prove that mathematics is completely internally consistent. This is actually impossible due to the incompleteness theorem of Goedel, but hundreds of years of advanced mathematics hasn't turned up any serious contradictions. To use the appropriate language, we have evidence that mathematics is "true", but we cannot know with absolute certainty. Even checking all proofs is impossible because there are a (countably) infinite number of them.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 6:25pm
Originally posted by 423zero

Maths I believe is only empirical science, so could all change in a couple of decades.
surely maths is the absolute opposite of empirical science - maths isn't just true for where it is observed to be true, it is *proven* to be true in all cases. That is, Ancient Greek maths will be forever true, the proof of Fermat last theorem will be forever true and will be true even if you move to another galaxy.
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423zero View Drop Down
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 12:27pm
4%  LOL That deserves a merit on it's own. Your report must have been a corker.
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Chris 249 View Drop Down
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Posts: 2041 		Post Options Post Options   Quote Chris 249 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 17 at 10:58am
Originally posted by 423zero

Maths I believe is only empirical science, so could all change in a couple of decades.
I tried telling my maths teachers that maths was subjective and I felt that my answers were more beautiful and since beauty is truth, I was right.

I still only got 4%. Cry
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davidyacht View Drop Down
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Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 17 at 9:58pm
I guess that the key is to get some real world knowledge in the real world.  Having approached a Naval Architectural degree (well actually Yacht and Powerboat design) as a mature student, I found it fascinating to learn the theory after some real world experiences in development classes.
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laser193713 View Drop Down
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Posts: 889 		Post Options Post Options   Quote laser193713 Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 17 at 9:33pm
Originally posted by KazRob

Why would a naval architect need to know about keels on yachts? As I write this I'm sat on a semi-submersible flotel beside a big triangular gas platform on legs. Both work well, both have 'hulls' and none of them have keels, other than perhaps of the structural type and all designed with input from naval architects. Indeed I know one who designs pipelines that get towed out half way between the surface and the sea bed. Buoyancy calcs are important but again nothing to do with keels again.
Most naval architects probably do industrial stuff and I guess you don't need to be able to sail to do most of that

Well I suppose it depends if you are a marine engineer, a yacht designer, or a naval architect. But to qualify as the latter I'm pretty sure most courses, including the one which I refer to, has a module on sailing yachts. To me the idea of living in a city surrounded by boats in marinas and not to have noticed the big dangly thing hanging out from under them all sat in their cradles is a bit strange. Not to mention we had a module on yacht surveying the year before which was carried out on a 33 foot cruising yacht and one of the main areas of concern on that particular boat was the keel bolts. 

I don't know a lot about the military side of naval architecture, but I have at least a vague idea what's hidden under the water! 

My point was rather that there are still a lot of misunderstandings and a lack of real world knowledge in the world of academia. 

And obviously, as pointed out, the answer to the other misunderstanding is in fact metacentric height. Which, incidentally, doesn't apply to a foiling moth whilst it is actually foiling as it isn't technically buoyant in that state. However, when lowriding I can assure you the answer is pretty damn unstable!  LOL
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423zero View Drop Down
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 17 at 9:31pm
Maths I believe is only empirical science, so could all change in a couple of decades.
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