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Old 09-07-2011, 09:34   #1
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Polar Diagrams

Hi all,

I've been trying to find polars for the 380, 400, 410, 420, 421 and the 440 but so far I've only found the 440. (, also mentioned in this forum in another thread)

We've been considering buying a Lagoon for some time now and have rented a few of them but polars would be VERY interesting for us to see before we make the final descision on which model we want, (Of course there are MANY other parameters: price, space, etc, etc, but polars would also be great to have!)

Would be great if we can collect links to polars here.

Inofficial, self-made polars are also very much welcome.



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Old 09-07-2011, 09:55   #2
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Re: Polar diagrams

The builder should have the polars or maybe US Sailing.

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Old 11-07-2011, 05:44   #3
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Re: Polar diagrams

Greetings and welcome aboard the CF, Janoz .

“PolarDesigner” is a Velocity Prediction Program, (VPP), that allows you to do direct calculations on your sailboat’s performance, i.e. creating your own polar.
Free Beta ➥
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"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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Old 11-07-2011, 06:22   #4
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Re: Polar diagrams

Polars? For cruising? Polar charts are handy for squeezing that last quarter knot out of a fully crewed racing boat...helping to determine when to do a spinnaker peel for example...and not much else.

If you still want polars, make sure they are computed at fully loaded cruising weight, not at design racing weight. There will be a huge difference.

Or...perhaps you are racing?
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Old 11-07-2011, 08:15   #5
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Re: Polar diagrams

Well, the reason for me looking for the polars is that the (objective) polars are a clear indication of a boats performance. I consider a quick boat a secure boat. When cruising I'd like to be able to outrun bad weather and the quicker the boat the better I can do that. So, polars are an important parameter when buying a cruising cat also. I have e.g. sailed the 420 and found it terribly slow. The 410 and the 400 I felt was much quicker and could go closer to the wind but having polars it would be easier to compare more objective than my feeling from chartering them for a week or two...

I've asked the local Lagoon agent but no luck there... I guess he did not have them and could not get them from Lagoon either.


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