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  #171  
Old 09-22-2013
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Re: Jeanneau Attalia


Dear Waymar
Going E when the wind i SE is about 45 degress to the wind, as an absolute wind angle. Your relative wind angle probably was around 30 degrees (if your boat speed was about ˝ of the wind speed - calculations by head). This is actually about what can be expected. My boat goes 25-30 relative degrees on one tack and 30-35 on the other (do not know why is is different).
In flat water you may point higher, in waves you will have to point lower to keep up speed (such as 45 degrees relative angle). Rather than just pointing high, I would balance this aginst the speed - always aiming for 5 knots or more upwind when the wind is 8-10 knots or more.
I got a new mainsail last year - wonderful to look at - but we are not doing better in the races ;-).
Best regards
Jens
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Jeanneau Attalia
1986
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  #172  
Old 09-22-2013
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Re: Jeanneau Attalia

link to new mainsail (I hope)

Jens

https://plus.google.com/photos/10548...CIm21r3K_N6xCA
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Jeanneau Attalia
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Last edited by JensK; 09-22-2013 at 05:08 PM.
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  #173  
Old 09-22-2013
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Re: Jeanneau Attalia

I point at about the same degree's as Jens. Sometimes a bit higher. Then again, I have laminate sails. I personally see no reasions to go with dacron these days, as laminates are about as cheap as dacron, but seem to streth less etc. So one gets a bit more power etc in lighter and heavier winds.

Not sure doing the bow would be a good thing. Putting an extension on the rear, ie a true sugar scoop has been done to many of this era. One way to extend the WL of your boat cheaply anyhow. Look at the sunshine 36/38 boats to see how this was done.

Marty
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  #174  
Old 09-23-2013
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Re: Jeanneau Attalia

Thanks guys,

The bow extension is not going to happen. I can just imagine what it would do to the balance, let alone trying to get a shape that would not disturb fluid flow. Although its an interesting thought as it would not affect the overall length of the boat, like a scoop on the stern would. That has also crossed my mind as a platform is always useful.

I've been looking at the polar diagram Jens sent over and it makes sense. I guess I get close to that as well. We had 2-3 meter waves and were also going against the current so I should not have expected better. But what a slog!

Jens looks like you got yourself a full batten package.. Looks nice!
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Waymar - Jeanneau, Attalia
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  #175  
Old 09-23-2013
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Re: Jeanneau Attalia

Dear Mark
Yes, in those waves and with current and wind against you, I would certainly also have a slog. No wonder that the police called you ;-). Anyway, this was very nice of them.
Only way out is a slender, high pointing boat going through the waves - and you would be soaked for hours. Unfortunately, we cannot have both (at the price).
Yes, the full batten mainsail is certainly an advantage. Go for that the next time. Even though the mainsail is smaller than the genoa, I believe it plays a major role for speed and pointing, because of the channel effect.
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  #176  
Old 09-25-2013
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Re: Jeanneau Attalia

This is what I picked up this week from Practical Sailor: The Effects of a Tidal Stream on Navigation
The effect of a tidal stream is a significant factor when navigating on any point of sailing, but can be crucial when sailing to windward. If you are in a small boat sailing to windward against a strong tide, it can often prevent you from making any headway at all and it may be best to enter a port or anchor until the tide or wind changes direction. If this is not possible, you should try to keep to shallow water, away from the strongest stream. The presence of a strong tide will also affect the strength and direction of the apparent wind. When the boat is beating against the tide, the apparent wind speed will be reduced because the boat is being carried downwind. The converse also applies. When the tide is running across the wind on the lee bow, advantage can be gained because it increases the speed of the apparent wind and alters its direction so that the boat is effectively freed and can point higher. When the tide is on the windward bow, the effect is the reverse, so try and tack when the tide changes to keep it on the lee bow..... Wondering if this would have the same effect just offshore.
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Waymar - Jeanneau, Attalia
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  #177  
Old 09-26-2013
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Re: Jeanneau Attalia

ANY current would be that way. Have had same effects with a canoe/kayak in a river.

Marty
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  #178  
Old 09-29-2013
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Re: Jeanneau Attalia

I need local knowledge....

On another note, do either of you know where the holding tank is? I am challenged by a new smell and am trying to locate the source.
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  #179  
Old 09-29-2013
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Re: Jeanneau Attalia

Found the holding tank! (In the cockpit locker actually). Never needed to know before... Any idea how to discharge the head directly overboard bypassing the holding tank? Very useful for those trips to St-Lucia or St-Vincent. Also what is the purpose of the Y valve in the head.

Now I need to find a way of emptying the holding tank. Not easy in Barbados...
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  #180  
Old 09-30-2013
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Re: Jeanneau Attalia

You should have an emanual pump assuming where mine is on the aft side of the head wall. The Y valve is then opened to discharge overboard vs putting shyte in the tank.

That is how it is supposed to work any who.

You could also have some older hoses, after a while the hose does not contain the smells. So one needs to replace them after a period of time. For this hose, higher more expensive hose is WELL worth the extra $$$.

Marty
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