Polars for production yachts

[dimitrivlc]

Hi, I'd like to introduce iPolar which is an iPad/iPhone app we developed to help production yachts sailors to get a good idea of their base polars fro cruising or club racing.

While we usually work for high end racing programs (to name a few in 2012 Groupama, Quantum Racing, Wild Oats XI, Bella Mente, MACIF...) we have been challenged by the developper of Weather4D to squeeze our 2 days of work advanced VPP into something which would cost around 10€ and take less than 5s while still not giving stupid results. Thus his users would be able to make a good use of the new routing capabilities of Weather4D.

After thinking it through, we have designed a set of yachts with lengths of 9,12 and 15m. For each length we have decided on 3 displacements which would cover the range from comfortable cruiser to cruiser racer and for each of these displacements we assigned 3 sailplans to cover the power/dsp/length ratios of production yachts. The 27 configs have been properly VPPed (that is 81 VPP because we have done it fro Joib+Main / Kite and A-Kite. It then becomes possible to interpolate any production yacht from 24 to 60ft within this net and the results are pretty good compared to the ORC VPP as the average error show:
Oceanis 320: average error 1%; std dev 3%
First 36.7: average error -1%; std dev 1%
Hanse395: average error 0.2%; std dev 3%
...

The good points compared to a base polar is that it is possible to get the polars for all your sailsets thus checkig what is the loss not using the spinnaker or what gains you can potentially make by increasing your genoa size in the light airs...

With already 300 users after one month of availability, it seems that iPolar is usefull.

www.sailingperformance.com/iPolar.html

[taylor23]

With the development of market of yatcht production and mass production of yacht yards, the owners
expected yachts quality becoming low. There is need to take step by yacht producers in order to
improve and maintain its quality.



marine electrical pedestals