Forums > Windsurfing   Gps and Speed talk

Alpha Rankings

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Created by hardie > 9 months ago, 14 Feb 2008
Yann
18 posts
15 Feb 2008 11:50PM
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snides8 said...

yep that is interesting i have been trying to judge 50 meters to leeward of where i think the upwind track was will have to have a rethink.
Chris, do yourself a favour and download gps action replay pro..this has a 'nice' feature called gybe analysis it gives you a rating or percentage result for your gybes....not sure how it is calculated but i checked the gybe of my pb alpha and got a score of 78% but i had scores on the same day to 84% does anyone know how the score works in this program? is anyone else using this program?
as far as i am concerned any gybe you can plane away from is a good one and obviously the lighter the wind the harder to plane away from.


Snides, The "Jibe Analysis" module of GpsarPro analysis ALL your jibes, and provides you with information for each of them :
- Start speed
- Min speed
- Finish speed
- Distance loss
- time
A global "score", which you're questionning about, is the ratio between min speed and entry speed : For instance, if your start speed is 20 knots, and your min speed is 10 knots, you'll get a 50% score. This is important info which indicates your ability to KEEP SPEED through jibe, whatever the average speeds (even if the wind is blowing at only 15 knots, you can get a good 60% score...).

Yann.

snides8
WA, 1731 posts
16 Feb 2008 10:22AM
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thanks for the responce Yann,
decrepit commented he was getting scores of 100%,i have seen him gybe and he is a great gyber, how ever the figure seems slightly suspicious. Where does the calculation start for the gybe and end? is this related to the sliding distance selector at the top of the dialog box?
congratulations on a nice program by the way!



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"Alpha Rankings" started by hardie