Having researched the articles on optimal routing recently, one of the many avenues of related research that presented itself was of course to do with determining what your boat performance characteristics really are. For a sailing yacht this at the very least involves having as reasonably accurate Polar Diagram.

My previous posting entitled “Boat characteristics and learning to Wally” generated some comments from readers which are worth following up.

I have now discovered that the University of Technology at Delft have developed a mathematical model based on their research into hull design and performance which they call the Delft Systematic Yacht Hull Series (DSYHS)

Their research ranges from traditional sailing yachts to systematic research to research on modern racing machines. Over the last 35 years research has focused on the influence of various parameters (hull parameters or heel and trim of the yacht) on the total resistance and sideforce production of the yacht. A total number of around 60 yachts have been tested and this number is still rising.

The outcome of this research has been used to devise a hydrodynamic model that can be used to calculate the resistance components on a sailing yacht based on hull parameters. These expressions have been used to create a Velocity Prediction Program (or VPP), in which the performance of a generic yacht can be predicted.

Based on the DSYHS research Mikael Razola and Jakob Kuttenkeuler have created Polar Designer. This is a free web based program that you can use to calculate a polar diagram for your own yacht.

Give it a try….very interesting…

Hi Russ, after surfing the internet for 5 hours I just found your article and link to create a polar diagram. I sail on a Beneteau 375 in The Netherlands and want to check the polars that we received via another source. Thanks for that tip!

That’s great Herman, glad the post was of help…email me if you find out more on this subject.. 🙂

I also sail on a beneteau 375 and have been trying to find a polar diagram for it. Can you help?

Has anyone obtained a polar diagram from their manufacture co. I would think this app. would be of great value in the hull design.We own a Dufour Classic 36 2001. You would think someone out there would offer this service. ????? Would appreciate any help.

thankyou,

Leo

I found a Polar for your boat (Beneteau 375) Here it is:

6,0 kn 8,0 kn 10,0 kn 12,0 kn 14,0 kn 16,0 kn 20,0 kn

52,0 ° 5,20 kn 6,20 kn 6,60 kn 6,80 kn 7,00 kn 7,10 kn 7,10 kn

60,0 ° 5,60 kn 6,50 kn 6,90 kn 7,10 kn 7,20 kn 7,30 kn 7,40 kn

75,0 ° 6,00 kn 6,70 kn 7,10 kn 7,40 kn 7,60 kn 7,70 kn 7,80 kn

90,0 ° 6,20 kn 6,90 kn 7,20 kn 7,40 kn 7,70 kn 7,90 kn 8,10 kn

110,0 ° 6,20 kn 7,00 kn 7,40 kn 7,70 kn 7,90 kn 8,10 kn 8,40 kn

120,0 ° 5,80 kn 6,80 kn 7,30 kn 7,70 kn 8,00 kn 8,30 kn 8,70 kn

135,0 ° 5,10 kn 6,30 kn 7,00 kn 7,40 kn 7,80 kn 8,20 kn 8,90 kn

150,0 ° 4,20 kn 5,40 kn 6,30 kn 6,90 kn 7,40 kn 7,80 kn 8,50 kn

Hello Great site you have.

Do you have a polar chart and diagram for Farr 520 (Farr design no. 444M2 ((2002))

thanks for you help

Dustin Carlsson

Hi Dustin

Sorry – you will have to look up the links on my blog – or do your own 🙂

Happy hunting

Kind regards

Russ

I tried to use the link to get to polar designer, but it did not come up. Any chance they changed the url? If not do you know of any other sources for reating polars.

Thanks alot!

Billy

Hi Bill

I can see that that link is now dead !

I have posted a new link here http://www.altendorff.co.uk/archives/2390

Perhaps you could try this neat little app called iRegatta….

All the best

Russ

There's a lot of polars here: http://jieter.github.io/orc-data/site/

Cheers Bimmer

Thanks – excellent site – shame it doesnt have my Moody 44 polars there 🙂

All the best

Russ

Hi there, I'm looking for a polar for a 1985 Irwin Citation (Shoal draft). I tried the site but I'm having trouble accesing it. Is one available? Thank you in adance for your time.

Hi there I'm looking for a polar for a 1985 Irwin Citation (Shoal draft). I tried the site but I'm having trouble accesing it. Is one available. Thank you in advance for your time. This is being reposted due to an email address error.