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Getting a Polar Diagram for your boat…

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.

PolarDesgner 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…

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