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Macroscien said..


agree , maybe we should consider the same rules for GM - the first and last leg must be within this 50 meters.
In the meantime we could sail at wish up and down the wind, but to finish we need meet this entry point by 50 meters.

PS. Now just for pure scientific purpose you could post your historical GM Ian.

for my best 1 hr of 19.67 knots where the runs were a NM long

18.21 km , 10 gybes that's 182.1

You win Macro!

( On my suggested method of scoring I get 18.2 (log 10 =1)

You'd have got 8.62 X log 21 = 11.47

Sailquick gets 30.68. )

The strategy will depend on the gybe weighting. But either way It'd be a good comp in the middle distance category, good for gybing consistency and I think upwind performance would end up being very important for a good score. Do you allow tacking?

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Ian K said..
Do you allow tacking?

Yes, I have no problem with tacking even beach start, even waterstart for our competition. As you know that may effect final score terribly.
Although I am surprised how some local guys are quick, efficient and fast with tacking. I am almost sure that at this stage they are faster with tacking then me with gybing.
To be fair I found tacking much more difficult to perform on small boards so I did almost gave up.

Congratulation Ian, on your GM, at such long NM legs this is really, really high score.
Anyway I am sure at next visit to the beach you will beat me on GM .

Look if you just half a distance on each leg and do 20 gybes but your speed drops to 17 knots you almost double your score!
But the risk for those unsure with gybing and falling into water also double. That why this system rewards gybing first, speed second ( unlike your Logarithm model)

GM Results
548.75 -Sailquick
399.00 -Lao Shi
190.00 -Sausage
182.28 -Macro
182.10 IanK

Copy that and add your result somewhere in the middle , or even below IanK*
*then replace Ian with your name

Just had a look at my best half hour - 18gybes 22.2km = 399.6
KAPOW Laoshi

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GeoGeo said..
Peter needs to mix with another slalom guys, watch, ask and listen.

Fine George, this is my first question then, What is your best GM , and Kurt ?
You improved on your gybing in recent time incredibly

GM Results
548.75 -Sailquick
399.60 -Sausage
399.00 -Lao Shi
182.28 -Macro
182.10 IanK
Copy that and add your result somewhere in the middle , or even below IanK*
*then replace Ian with your name

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Macroscien said..

GeoGeo said..
Peter needs to mix with another slalom guys, watch, ask and listen.

Fine George, this is my first question then, What is your best GM , and Kurt ?
You improved on your gybing in recent time incredibly

My problem is I don't have a time for that. Once I load the data and have a quick look I delete everything.

30 mins 27 gybes x 20.5km = 553

Run is on KA72 if you want a look. 24 Nov 2011 Lake Clearwater.

I was doing an hour run in an 800m wide lake.....lots of gybes!

53 for the hour.

It would be interesting to see what results Jack Wood and the Cloggies get with their hot gybing.

How are you guys counting the gybes? Just a visual count or something clever?

My tracks overlap each other and I can't really make out how many.

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FormulaNova said...
How are you guys counting the gybes? Just a visual count or something clever?

My tracks overlap each other and I can't really make out how many.

Formula,
I just set up a half hour division in realspeed and then counted the dips (gybes) in the speed graph at bottom. Still Not really sure what the gm achieves though.

GM Results

553.00- Te Hau
548.75 -Sailquick
399.60 -Sausage
399.00 -Lao Shi
182.28 -Macro
182.10 -IanK

Copy that and add your result somewhere in the middle , or even below IanK*
*then replace Ian with your name

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FormulaNova said..

How are you guys counting the gybes? Just a visual count or something clever?

My tracks overlap each other and I can't really make out how many.

What I do:
1. open .gpx file in program GPSResults V.6
2.Look for most promising 30 minutes on whole graph
3. Set Timelimits filter from hhmm to:hhmm to get proper 30 min period
4.Program will show now distance exactly made at the time
5. I count manually gybes or peaks on the graphs

Formula, you could post link to your KA72 file or show the date and place and could download and try to calculate for you,.

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FormulaNova said..

How are you guys counting the gybes? Just a visual count or something clever?

My tracks overlap each other and I can't really make out how many.

GPSAR has a very cool Jibes analysis function which does it all for you.
Just clip the run at 30 minutes, save the run, re-open, push the 'speed' button, go to jibes analysis and all done.
I counted them also just to double check.

GPSAR Jibes function analysis does.....
min/max/average speeds, Gs/ Gs over time, 4 sec radius, all distances.
You set the alpha distance on a slide bar.
More info than you'll ever need.
Get in there and analysis your brains out!

This is a terrible idea!!!

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remo81 said..

This is a terrible idea!!!

Just tell me what is your GM and I will update our score list.
There is still plenty of room below Ian, not much above Te Hau

The GM 'metacentric height' is a measurement of the initial static stability of a floating body. It is calculated as the distance between the centre of gravity of a ship and its metacentre. A larger metacentric height implies greater initial stability against overturning. Metacentric height also has implication on the natural period of rolling of a hull, with very large metacentric heights being associated with shorter periods of roll which are uncomfortable for passengers.

I think that you will find that there is plenty of room on your list as not many people will go along with this bad idea. Props for thinking of something that is just like free slalom racing though...

Seems like quite a large and diverse campaign against GM is starting to brew up :








The only one in favour of GM seems to be Death himself :

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remo81 said..

... Props for thinking of something that is just like free slalom racing though...

Thank you for your input. My idea was exactly to create something similar to slalom racing (simulation) in our own backyards , like free race.
This is just proposal and if you have idea for improvement or even different methodology , you are welcome to share.
I wish GM to be community project so resultant computation could looks different to that proposed by me

This model appreciate sailor skills in both gybing and high speed sailing on the virtual course, but also require good stamina and concentration over this 30 minutes exercise.

To be fair we still not sure how to create mathematical condition that limit sailors down the wind drift over this 30 minutes.

100 meters proximity doesn't sound rigth, so maybe something like that will be better :

"Sailor is allowed to drift down wind from entry point to finish to the distance equal to longest leg before or after gybe"

Please advice Remo what do you think about that condition or shouldn't we worry about sailing progressively down the wind at all ?

or just make this simple: Maximum 500 meters allowed down wind from entry point to exit !

anybody have opinion here ?


BTW it will be very interesting to know who is better in this GM ? Good slalom racer or pure speed racer ?

My bet could be on slalom racer because 1. He know that failing the gybe means loosing the race 2. Good acceleration after the gybe is crucial

An another hand speed sailors I know are incredibly good at alpha... so competition between this two could be fierce

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Carantoc said..

I am trying hard ( to imagine ) but sorry I can't Alternative means possibly back to cannibalism in this 1 billion people population .

Sorry Macro I'm into speed sailing. Alphas and Hrs don't mean anything to me.

You should talk to the Windwanderes as they have there free race series that is very similar to your concept. Just an easier way of working it out.

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kiteman69 said..

You should talk to the Windwanderes as they have there free race series that is very similar to your concept. Just an easier way of working it out.

Thank you for advice. That is exactly what I am doing behind the scene now. They have the best people in the world and experience.
With their help I hope to make this easy for all of us : if they could come with automatic formula calculating GM will be great
We could just download GPS file as usual and read GM.
Rest on us if we bother with this result or not at all - because this is completely voluntary competition.

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Macroscien said..

remo81 said..

... Props for thinking of something that is just like free slalom racing though...

Thank you for your input. My idea was exactly to create something similar to slalom racing (simulation) in our own backyards , like free race.
This is just proposal and if you have idea for improvement or even different methodology , you are welcome to share.
I wish GM to be community project so resultant computation could looks different to that proposed by me

This model appreciate sailor skills in both gybing and high speed sailing on the virtual course, but also require good stamina and concentration over this 30 minutes exercise.

To be fair we still not sure how to create mathematical condition that limit sailors down the wind drift over this 30 minutes.

100 meters proximity doesn't sound rigth, so maybe something like that will be better :

"Sailor is allowed to drift down wind from entry point to finish to the distance equal to longest leg before or after gybe"

Please advice Remo what do you think about that condition or shouldn't we worry about sailing progressively down the wind at all ?

or just make this simple: Maximum 500 meters allowed down wind from entry point to exit !

anybody have opinion here ?


BTW it will be very interesting to know who is better in this GM ? Good slalom racer or pure speed racer ?

My bet could be on slalom racer because 1. He know that failing the gybe means loosing the race 2. Good acceleration after the gybe is crucial

An another hand speed sailors I know are incredibly good at alpha... so competition between this two could be fierce

Is it just me getting tired ??

It's just a short 1 hr and the good 1 hr times will still be at the top. Find a good 1 hr time that doesn't get a good 1/2 hr. There's your challenge

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Macroscien said..

GM Results

553.00- Te Hau
548.75 -Sailquick
399.60 -Sausage
399.00 -Lao Shi
182.28 -Macro
182.10 -IanK

Copy that and add your result somewhere in the middle , or even below IanK*
*then replace Ian with your name

553.00- Te Hau
548.75 -Sailquick
404.04 -Slowcoach 19.24km x 21
399.60 -Sausage
399.00 -Lao Shi
182.28 -Macro
182.10 -IanK

Smoked ya snags