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Board » General Discussion » IMSYC 2011

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Posted by
WhyNot


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2011-02-03 18:39:54
2011-06-14 13:27:32 - Re: IMSYC 2011
Rod, can you move your cursor down the TWA 180 line and check the readout around 8 kn TWS?
Posted by
Rod


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2010-06-24 22:30:48
2011-06-14 13:53:45 - Re: IMSYC 2011
Tom: I think that has to be covered by someone who can calculate the numbers. All I can do is estimate, which you can do yourself....
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
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WhyNot


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2011-06-14 13:55:58 - Re: IMSYC 2011
Sorry, I was not clear in my question. I can not check the screen readout for an uprising. I sail a katrin.

I can not get the Polar data either (.csv or .txt) for the same reason. If I had the data, it would be easy to "crunch" the numbers.

--- Last Edited by Tom Nordahl at 2011-06-14 13:59:16 ---
Posted by
Rod


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2011-06-14 14:05:36 - Re: IMSYC 2011
See both polars in my post above here.
The numbers are available on the 'home' page where we all saw them originally.

p.s. They are still there. I just checked.

--- Last Edited by Rod at 2011-06-14 14:07:15 ---

--- Last Edited by Rod at 2011-06-14 14:10:24 ---
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Posted by
Rod


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2011-06-14 16:20:45 - Re: IMSYC 2011
What a bunch of un-observant, amateur puddle-splashers we are, to have not noticed the elementary fact that a boat cannot sail downwind faster than the wind speed.
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
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Posted by
Rod


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2011-06-14 17:55:55 - Re: IMSYC 2011
Even if the wind speeds are in metres/sec and the boat speeds in Kn, the polar on the original 'home' page shows the line giving 10 knots boat speed in a 7.8 knot wind. Contrary to all those who wish for perpetual motion, this is not possible, and wishing will not make it so!
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Posted by
Smo


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2011-06-15 05:08:31 - Re: IMSYC 2011
Yes the wind speed look's like to be in M/S so 8m/s is around 15.5 kn
Posted by
WhyNot


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2011-06-15 10:36:38 - Re: IMSYC 2011
I'm sure the engineroom will act upon this. This can be dealt with in the handicap values. Its only overall that it has impact.
The standard handicap algorithm does not envision "faster than the wind" performance between TWA 150 and -150 at a certain WS
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Rod


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2011-06-15 15:55:54 - Re: IMSYC 2011
I am more than a little puzzled why anyone would ever present a table with wind speed in "meters per second" and boat speed in "nautical miles per hour".
Why not "eights of a furlong per metric second" (100,000 metric seconds per day)? That would confuse us all.

--- Last Edited by Rod at 2011-06-15 15:56:25 ---
If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Posted by
WhyNot


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2011-06-15 21:48:55 - Re: IMSYC 2011
Polars are either in m/s or knots. Both are quite common in Norway - with the younger generation preferring m/s.

I just don't understand how thats relevant in this case - as long as we are discussing uprisings "impossible" polar.

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