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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Sailing to VMG		  New Topic  Topic Locked
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jandrus
1st Mate

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USA
79 Posts
Initially Posted - 01/15/2003 :  10:37:34  Show Profile
The recent post on wing and wing and its devolution into downwind theory made me start wondering about instrumentation. I was given a GPSMAP 76 for Christmas. With its VMG feature, any reason not to select the next mark as the next waypoint and sail to best VMG? Seems like the way to go to me.

I don't want to have to be looking at the GPS all the time though, so I plan to spend the early part of the season tuning the boat and making a rough polar diagram. I'll share it when its ready.

Justin

c25 #1942 s/v tako kichi
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mqp
1st Mate

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USA
46 Posts
Response Posted - 01/15/2003 :  13:27:16  Show Profile
Sailing the best VMG to a mark is useless because it's constantly changing as your position changes relatively to the mark. If the mark is upwind or downwind of your position then it's best to sail the best VMG to the wind direction (not the direction to the mark). The best way to do this is to enter a way point dead down wind (DDW) of your position and very far away (preferably infinitely far away), and to sail the best VMG toward the DDW mark keeping in mind the laylines to your original mark.
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osmepneo
Past Commodore

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USA
1420 Posts
Response Posted - 01/16/2003 :  11:26:22  Show Profile
The polar diagrams are the key to the best route downwind, to help answer the question which way is the best way to go. It seems to me that a couple of years ago someone posted something about c25 polar diagrams. Does anyone remeber that or have polar diagrams for the c25? Or, is my mind suffering from mid term event creation? <img src=icon_smile.gif border=0 align=middle>


Don Peet
c25, 1665, osmepneo, sr/wk
The Great Sacandaga Lake, NY
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.