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  #11  
Old 04-15-2012
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Re: Polar Diagrams-Newport41-Benetaeu 421

Newport41

TWA 6 8 10 12 14 16 20
52 5.0 5.9 6.4 6.6 6.7 6.8 6.9
60 5.3 6.3 6.7 6.9 7.0 7.1 7.2
75 5.7 6.5 6.9 7.2 7.4 7.5 7.6
90 5.9 6.7 7.1 7.3 7.4 7.6 7.9
110 5.8 6.7 7.1 7.5 7.7 7.9 8.2
120 5.5 6.5 7.0 7.4 7.7 8.0 8.5
135 4.8 6.0 6.7 7.1 7.5 7.9 8.5
150 4.0 5.1 6.0 6.6 7.1 7.4 8.1


Benetaeu 421


TWA 6 8 10 12 14 16 20
52 5.5 6.4 6.9 7.1 7.3 7.4 7.4
60 5.9 6.8 7.2 7.4 7.5 7.6 7.7
75 6.2 7.1 7.5 7.7 7.9 8.0 8.2
90 6.3 7.2 7.6 7.8 8.1 8.3 8.5
110 6.2 7.1 7.7 8.0 8.3 8.5 8.8
120 5.8 6.9 7.5 8.0 8.3 8.6 9.1
135 5.0 6.3 7.1 7.6 8.1 8.5 9.1
150 4.2 5.3 6.3 7.0 7.5 8.0 8.7
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  #12  
Old 04-15-2012
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Re: Polar Diagrams

I've been curious about my Contessa 26... I wonder if anyone has bothered to create a polar for them.
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Old 04-20-2012
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Re: Polar Diagrams

Most interesting.

Polar Diagrams used to be published with every sailboat review in the old issues of Yachting, Rudder and the like. You do not see them anymore. I wonder why. Perhaps the fact that they START at 52 degrees from the true wind angle is a clue.

As a point of reference, my IOD, designed in 1938, and horribly slow, inefficient, and otherwise unsuitable by modern standards, sailed at an average of 39 degrees to the true wind as measured by the course over the ground between known landmarks on the shore of a relatively narrow channel (The Alameda Estuary, Oakland California.) This was before gps, so some experimental error is in there but this is an average of about a dozen runs up the same channel, roughly six legs, dead to windward usually, and it is taken from courses plotted on a chart, by reference to shore marks at each tack. And we were not pinching or trying to prove point. I only did the measurements after the fact when a question like this came up. We were just sailing.

I suppose if I were the NA of a thing that couldn't go much closer to the wind than 50, or even 45 degrees, I would not want the curves published either.
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Old 06-27-2012
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Re: Polar Diagrams

Quote:
Originally Posted by Grendler View Post
Diagrams are from 33ft (Pearson, Contessa) up to 60ft (Centurion, Deerfoot, Swan). Sorry

Catalina I got only 36 model:

TWA 6 8 10 12 14 16 20
52 4.9 5.8 6.3 6.6 6.8 6.9 7.0
60 5.3 6.2 6.7 6.9 7.1 7.2 7.3
75 5.6 6.5 6.9 7.3 7.5 7.6 7.7
90 5.7 6.7 7.1 7.4 7.6 7.8 8.1
110 5.6 6.6 7.1 7.5 7.8 8.1 8.4
120 5.3 6.4 7.0 7.4 7.8 8.1 8.6
135 4.7 5.8 6.6 7.1 7.5 7.9 8.5
150 3.9 4.9 5.8 6.6 7.0 7.5 8.2
Thanks but these seem hoplessly optimistic for my TR, WK C36 with newish <4 y.o. dacron sails. I can only comment on the upwind to beam reach figures, since I believe these polars assume a spinniker once past a beam reach and my boat is not set up with spin gear.

Also, Since the wind angle is given as true, I'm assuming the wind speeds are also supposed to be true. Any idea if that's a valid assumption?
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  #15  
Old 06-27-2012
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Re: Polar Diagrams

PalmettoSailor, you are correct. They are true wind speed and direction.

I came across this PDF that explains it better than I can.
http://www.ockam.com/docs/SplainPolars.pdf
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  #16  
Old 08-17-2012
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Re: Polar Diagrams

Grendler....you wouldn't happen to have Polars for a 1982 Pearson 37R would you?

Thanks in any case.

Greg
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Old 08-21-2012
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Re: Polar Diagrams

US Sailing has polars for just about anything with sails that floats, but they're not free or cheap. I believe their diagrams show angles of attack from closer to 0 degrees to 180. You can also create your own diagrams empirically, but it's a lot of work to document all the wind speeds, angles, and boat speeds.
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Old 03-16-2013
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Re: Polar Diagrams

Does someone have the polars available from a gib'sea 444 or 442?
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Old 05-27-2014
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Re: Polar Diagrams

Hello,
I am looking for a Polar Diagram for a Ranger 37...
Would you happen to have one?
Best, Mick Moore
San Diego
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