Polars tutorial

The polars of the boats make it possible to know the boat speed according to many parameters :

  • Boat options ( Foils / polish).
  • Available sails.
  • Wind speed ( TWS ).
  • Wind angle ( TWA ).

As a result, they can be complex to understand and it can be time consuming to integrate all their subtleties..

The polars can sometimes have "holes", these conditions where the boat loses speed, where it does not gain speed are not always easy to detect on the "classic" representation of the polars.

ITYC.fr offers you this spreadsheet to allow you to more easily analyze the polars of the boats.

After selecting a boat, the data will be visible.

Boat selection.
Equipments selection.
Boat speed as a function of wind speed (TWS) for a fixed wind angle (TWA).
Boat speed as a function of wind angle (TWA) for a fixed wind speed (TWS).
Boat speed as a function of wind speed (TWS) at the best VMG angle.

You must select the boat using the selection bar at the top of the page.
Boat type can be found in the game on the polars page at the top left.
or on the excellent site of Toxcct , in the left column.

Presentation

You must select the equipment (options and sails) equipped on your boat

This section is divided into 2 parts :

The area used to manage options and packs.
The zone allowing the activation / deactivation of each sail.

Options and Packs

  • Full pack : Activate all options and sails in 1 click!
  • Foils : Activate / Deactivate foils option.
  • Hull polish : Activate / Deactivate hull polish option.
  • Light wind sails : Activate / Deactivate Light wind sails option pack ( LG / LJ ).
  • Strong wind sails : Activate / Deactivate Strong wind sails option pack ( HG / SS ).
  • Reaching sail : Activate / Deactivate Reaching sail option pack ( C0 ).

Sails

In this section you can independently activate / deactivate each sail.

After selecting your equipment, you must adjust the wind angle (TWA) using the area to the right of the graph..
Average wind angle TWA ( ° ).
This angle can be set using the slider, arrow key of the keyboard, or you can enter it directly (decimal separator ',' or '.').

For example, for the tara boat at a TWA of 90 °, we obtain the following curve

The color of the curve corresponds to the best sail at that wind speed

If you click on the name of a curve, you can show / hide a curve.

With the wheel of your mouse, you can zoom in on the curve.

By holding the left button of your mouse, you can move the curve after zooming.

Use the 'reset zoom' button to reset the display.

We quickly realize that the fleece has 2 degraded areas, between 6 and 10 knots and above 16 knots

We will therefore try to avoid sailing in winds above 16 knots.

When the cursor is hovered over the curve, a toolbox like this one appears :

Vitesse du vents ( noeuds ).
Vitesse du bateau ( noeuds ) et meilleure voile.

After selecting your equipment, you must set a wind speed (TWS) using the area to the right of the graph.
Average wind speed TWS (knots).
This value can be set using the slider, arrow key of the keyboard, or you can enter it directly (decimal separator ',' or '.').

For example, for the tara boat at a TWS of 20 knots, we obtain the following curve

The color of the curve corresponds to the best sail at that wind angle

If you click on the name of a maneuver, you can show / hide a curve.

With the wheel of your mouse, you can zoom in on the curve.

By holding the left button of your mouse, you can move the curve after zooming.

Use the 'reset zoom' button to reset the display.

We quickly realize that the polar curve has 1 almost flat zone in TWA 35 ° and twa 70 ° .

This means that a change in the wind angle will have little impact on the speed in this range..

Note also the tooth present around the TWA 125 °.

When the cursor is hovered over the curve, a toolbox like this one appears :

Wind angle TWA ( ° ).
Boat speed (knots) and best sail.

After selecting your equipment, the best VMG angle curve will appear.

You will find the best higher and lower VMG angle according to the wind speed.

For example, for the tara boat, we obtain the following curve

The color of the curve corresponds to the best sail at that wind angle

If you click on the name of a maneuver, you can show / hide a curve.

With the wheel of your mouse, you can zoom in on the curve.

By holding the left button of your mouse, you can move the curve after zooming.

Use the 'reset zoom' button to reset the display.

When the cursor is hovered over the curve, a toolbox like this one appears :

Wind angle TWA ( ° ).
Boat speed (knots) and best sail.

After selecting your equipment, the best speed curve will appear.

You will find there the angle to the wind (TWA) to obtain the best speed according to the wind speed

For example, for the boat tara, we obtain the following curve

The color of the curve corresponds to the best sail at that wind angle

If you click on the name of a maneuver, you can show / hide a curve.

With the wheel of your mouse, you can zoom in on the curve.

By holding the left button of your mouse, you can move the curve after zooming.

Use the 'reset zoom' button to reset the display.

When the cursor is hovered over the curve, a toolbox like this one appears :

Wind speed ( knts ).
Wind angle ( ° ), boat speed ( knts ) et best sail.