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PabloPicasso 
Lieutenant 
Joined: 18 April 2025 Location: Dublin Status: Offline Points: 28 |
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 Topic: PolarPosted: 07 July 2025 at 09:36 |
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Anyone have a polar diagram for a 301 that they're willing to share?
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Bitbaltic
Captain 
Joined: 26 November 2011 Location: South Wales, UK Status: Offline Points: 181 |
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Posted: 10 July 2025 at 20:09 |
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I used to have an onboard PC (now swapped out for an iPad) which carried an NMEA polars software which was entirely in French. It gave some superoptimistic (7.5kn!) numbers and I never trusted it although my ability to interpret its setup instructions was suspect.it was the only windows software I could find dedicated to a polar. I think some of the ultra racy nav packages back in the day could produce one, but couldn’t afford them.
I have full NMEA feed for polar info through a WiFi multiplexer so I looked for a boat app on the iPad that would compute a polar but there seems to be nothing at all out there. Seems strange that nobody has made an app for it. Don’t think any published info from Hanse ever existed and obvs will never exist now, so would love someone still racing a 301 to come up with it but I think our chances are limited. |
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Hanse 301 'Karisma' | https://sailingkarisma.wordpress.com/
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sailingfree
Commander 
Joined: 20 May 2007 Location: United Kingdom Status: Offline Points: 103 |
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Posted: 11 July 2025 at 16:04 |
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Some time ago I added the stats to a velocity prediction program for the 301. I’ve put it on GitHub here https://github.com/sailingfree/Python-VPP-with-Hanse-301-polars
I’m away at the moment so I’m sorry but I can’t run it to generate the plot. The model for the wing keel 301 is. hanse_301_wingVPP.py And was collected from published data and measurements used in our local club racing in Poole. I used this for racing for a few years and it seemed pretty close, but I must admit I never really took the time to collect much real data to properly validate the model. I’ve since built some detailed realtime logging of boat performance so maybe I’ll get around to doing the cross checks. Anyway, this might be of some interest. Pete
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samuel
Admiral of the Fleet 
Joined: 26 December 2004 Location: United Kingdom Status: Offline Points: 2770 |
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Posted: 11 July 2025 at 17:25 |
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Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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PabloPicasso
Lieutenant
Joined: 18 April 2025 Location: Dublin Status: Offline Points: 28 |
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Posted: 11 July 2025 at 18:59 |
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Hi Pete
I havw to confess that all this IT stuff is a bit beyomd me. But I may comfer with some sailing pals with IT backgrounds who may find it all easier. Would you be happy for me to share this info/data? |
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sailingfree
Commander
Joined: 20 May 2007 Location: United Kingdom Status: Offline Points: 103 |
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Posted: 11 July 2025 at 19:26 |
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Sure, it’s basically there for anyone to use. The package is open source with a very permissive license.
Pete
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