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#128371 - 01/11/08 01:23 PM Re: Someone is paying attention [Re: Wouter]
Rolf_Nilsen Offline

Carpal Tunnel

Registered: 05/15/03
Posts: 4343
Loc: West coast of Norway
I did not say I tought it made sense We both remember the brit T alu-mast development project which was used as leverage to get the carbon mast ballot trough. But let us not tear apart what the ITA is trying to do.

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#128372 - 01/11/08 01:26 PM Re: Someone is paying attention [Re: Rolf_Nilsen]
Matt M Offline
addict

Registered: 06/18/01
Posts: 548
Loc: MERRITTISLAND, FL
Quote:

Spending GBP100.000 should be no problem. Just invest in enough computer modelling and CFD analyzes. It dont have to make the boat faster, those writing the checks just need to believe it makes the boat faster.






I am not quite sure why the sailing community is so fixated on having limits and extensive restrictions to the equipment. This is definitely not an Olympic contraint. Look at all the money and design that goes into the Bobsled event. To carry the argument even further, I think we should make all the runners wear the same shoes, that would equal things up as well.

100K is easy to spend on a boat if you really want. Unless the event supplies the equipment and swaps out every race, there will be variation that is boat and not sailor related. Part of sailing though is fitting the sailor to the boat; Weight, sailing slyle, etc, etc.

The real question is how does this fit into this thread.... Sorry.

Matt

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#128373 - 01/11/08 02:08 PM Answers to the question [Re: Wouter]
Wouter Offline
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Registered: 06/16/01
Posts: 9582
Loc: North-West Europe
situation -1- Probability is : 1 - (5/6)^6 = 0,67
situation -2- Probability is : 1 - (5/6)^12 - 12*(1/6)*(5/6)^11 = 0,62
situation -3- Probability is : 1 - (5/6)^18 - 18*(1/6)*(5/6)^17 - 18!/2!*(1/6)^2*(5/6)^16 = 0,60


I had to use the symbol "!" to denote the mathematical operation of faculty, which means :

18! = 18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1

As such the expression 18!/2! denotes

(18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1) / (2*1) = 18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3


Now some people will say, hey look the difference between situation -1- and -3- is quite large as it is comparing 0.67 to 0.60, we could have just found the answer by just simulating it (actually throwing the dice and counting the number of times the statements are satisfied !)

In reality the difference is really not that large and actually simulating the results would require 1000's throws to have the variance of the averaged experimental results be smaller then the probabilty difference of 0.67 - 0.60 = 0.07. It requires a good number more experiments to have a sifficiently high accuracy level assigned to your conclusion to make the conclusions dependable that one situation is more likely to happen then another WHILE ASSUMING LABORATORY LIKE CONDITIONS (tightly controlled) during the whole time you are simulating.

All that for a simple problem as stated above.

Now try the same statistical simulating strick in an environment where the conditions can change each 10 minutes and where the overal problem is a 1000 times more complex as we have in sail boat racing. Now try to discover which change to the design has actuall improved the performance of the boat. And now we know why the aging Hobie Tiger is still just as fast in capable hands as the nacra Infusion when both are using similar suits of sails.


Back to the original topic now.

Wouter


Edited by Wouter (01/11/08 02:19 PM)
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Formula 16 NED 243 (one-off; homebuild)
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#128374 - 01/11/08 09:14 PM Re: Answers to the question [Re: Wouter]
Robi Offline
Carpal Tunnel

Registered: 07/08/04
Posts: 2718
Loc: St Petersburg FL

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#128375 - 01/12/08 02:51 PM Re: Answers to the question [Re: Robi]
Stewart Offline
old hand

Registered: 07/15/01
Posts: 953
Loc: Western Australia
I understand what the ITA is trying to do.. Place itself at the fore-front of cat sailing. Making its case for the T as the cat sailing world's olympic representative. So I'm not going to knock them in their efforts.

Personally I agree costs stated by the ITA and reasoning behind the dropping of the T are furfies. But this isn't a game of reality its a game of perception. At least they are trying to get cats back in.

Also, I don't believe there is anything new in the past 2 decades that have been introduced into cat/skiff building.. Nomex/carbon was state of the art back in 1985 and still is today. Sure they could go to boron/carbon but the benefit comes at a cost. Not in money but in brittleness.. To be honest the T isn't the lightest boat around so why bother? Nomex/carbon is a total waste in the steamroller weight classes. But that is only my opinion *smiles* Hell even the A class can be built down to weight without going to nomex/carbon..


Just thought it was cool to see the ITA acknowledge our little class!!


Edited by Stewart (01/12/08 03:31 PM)

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#128376 - 01/14/08 03:49 AM Re: Answers to the question [Re: Wouter]
Glenn_Brown Offline
member

Registered: 11/11/03
Posts: 130
Loc: CA
Quote:

I had to use the symbol "!" to denote the mathematical operation of faculty




We call it "factorial" in English.

My favorite combinatorial problem: How many ways are there to put N identical balls in M distinct buckets? It's cool problem because you won't get it through brute force, but when you look at it the right way, you can just write down the answer, with only a basic background in combinatorics.

Another bit of brain candy for math lovers: How many zeros are on the end of "100!" ? This requires only very basic (pre algebra) math, and insight.

--Glenn

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#128377 - 01/14/08 04:45 AM Re: Answers to the question [Re: Glenn_Brown]
ncik Offline
old hand

Registered: 10/18/05
Posts: 951
Loc: Brisbane, Queensland, Australi...
My first guesstimate is 21...

the theory I've used has worked for 10! and 20!, but can't check higher numbers with my calculator.
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#128378 - 01/14/08 09:58 AM Re: Answers to the question [Re: Glenn_Brown]
Wouter Offline
Carpal Tunnel

Registered: 06/16/01
Posts: 9582
Loc: North-West Europe


Quote:


We call it "factorial" in English.





Thanks.

Despite having done very large portions of my education in English I still fail to remember some of the correct names. Even if you become a fluent speaker, you will never become a native speaker.

Wouter
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Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands

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#128379 - 01/14/08 04:07 PM Re: Answers to the question [Re: ncik]
Glenn_Brown Offline
member

Registered: 11/11/03
Posts: 130
Loc: CA
Quote:

My first guesstimate is 21...




Well done! Want to explain why?

--Glenn

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#128380 - 01/14/08 04:57 PM Re: Answers to the question [Re: Glenn_Brown]
scooby_simon Offline

Hull Flying, Snow Sliding....
Carpal Tunnel

Registered: 02/06/04
Posts: 3526
Loc: Looking for a Job, I got credi...
Quote:

Quote:

My first guesstimate is 21...




Well done! Want to explain why?

--Glenn




I'll go for 24 zeros.

Each of the numbers ending in a zero create a zero on the end so that's 9 zero's
the 100 adds 2 more (so total is 11)
BUT 50 adds 2 zeros (2x50) so that is a total of 12 (we already countered one of them)

Each number that ends in 5 also creates zero's (so that's 10 zeros)

BUT 25 and 75 create 2 zeros (2x25 and 6x75) so that's 2 more

Total 24 zeros....



Don't understand why it's 21.......
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