Calculate your customized velocity predictions (aka “polars”) with Avalon VPP


We are pleased to introduce Avalon VPP, our new system able to calculate very precise velocity predictions for your boat. 

The system has been successfully demonstrated during the Paris Boat Show a couple of weeks ago. It has even been presented to a well known naval architect who has appreciated its professionalism.

The system in now online at:

A user’s guide is available here:

The system has been designed to compensate the weaknesses of standard VPPs that can be found on the web, from sailing organizations or shipyards. VPPs are usually calculated for a given boat and for a given navigation, most often for regattas with brand new racing sail sets, optimum propellor, almost empty water and diesel tanks, ideal hiking crew, etc ..

The “one size fits all” is not a valid concept for boat velocity predictions !

In fact one would need a different set of VPPs per major sailing type: regatta, long term cruise, short term cruise, …

Avalon VPP enables you to calculate as many VPP as needed by changing your boat (hull and sails) parameters as required.   

This facility is offered free of charge to our users so that they can benefit fully from precise route calculations.

The calculations are very complex and can take up to 30 seconds to complete. This is because we have to find the equilibrium points (heeling/righting and driving/resisting) for every TWS (True WInd Speed) and TWA (True WInd Angle). I

The system is now operational for:

  • Sloop, ketch, yawl and some schooners
  • Main sail, jib, genoa (roller furling or not), spinnaker, asymmetric spinnaker, code 0 and mizzen sail.
  • TWS: 6, 8, 10, 12, 16, 20, 25 and 30 knots
  • TWA: 38, 40, 42, 45, 50, 55, 60, 65, 70, 75, 90, 95, 100, 110, 120, 135, 140, 150, 160, 170 and 180 degrees.       

 This is only the first version of this software which will evolve in the next coming weeks.

Below is a VPP exemple for a Sun Fast 3200 (Main Sail + Jib) in regatta configuration. 



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