Automatic sails tutorial

Thanks to the game's automatic sail management, we don't have to worry about changing sails by hand.

The criteria for change are multiple :

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

A coefficient called "overspeed" is applied to the speed of the sail to avoid untimely sail changes.

In fact, in "automatic sail" mode, in order for the game engine to change sails, the speed obtained with the new sail must be 1.4% higher than the speed of the current sail.

There are therefore areas of overlapping sails.

ITYC.fr offers you this spreadsheet to allow you to analyze more easily the sail changes.

After selecting a boat, the data will be visible.

Boat selection.
Equipments selection.
Active Sail - Fixed TWA.
Active Sail - Fixed TWS.

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.

Presentation

My router would make me change my sail for 1 hour? We have to go through an intermediate sail, is it useful?

Does the recovery coefficient cover these cases, and avoid this sail change and associated penalties?

ITYC.fr offers this tool allowing you to answer these questions in a few clicks!!!

This section is divided into 2 parts:

On the left, a curve representing the boat speed, the theoretical active sail and in automatic mode.

On the right you will find the settings.

You have to set your conditions on the right side to get an update of the curves.

It is mandatory to enter the start and end TWS in the "correct" direction to get consistent results.

I.e., if you find that the wind is accelerating from 18 to 20 kts , you absolutely must enter 18 kts in the start value and 20 kts in the end value.

If you find that the wind is decelerating from 20 to 18 kts , you absolutely must enter 20 kts in the start value and 18 kts in the end value.

This is because the behavior of the sail cover is not identical to the acceleration or deceleration of the wind.

Sail curve

The curves represent boat speed in knots as a function of wind speed at the specified TWA.

The "Theo" curve represents the boat speed with the manually selected sail regardless of the overlap coefficient.

The "Auto" curve represents the boat speed with the sail selected automatically taking into account the overlap coefficient.

The hatched area corresponds to the overlap area of the sails.

For example,
A partir de 1 , le spi (vert clair), recouvrera le code 0 (en vert foncé).
Then part of the heavy spinnaker ( in dark red) from 2.
Finally from 3, the sail change will be effective, and the heavy spinnaker will be installed."

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

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

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

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

When hovering the cursor over the curve a toolbox like this one appears:

Wind speed ( knts ).
Boat speed ( knots ), sail, sail cover gain if relevant.

Setting

To display the sail change curve, you will need to fill in the following different values:

.
Actual Sail.

Wind Angle (TWA).

Wind Speed (TWS) at study start.

Wind speed (TWS) at study end.

Zoom reset.

You can use the slider, the arrows on your keyboard, or enter the value directly to adjust the values.

Introduction

My router would make me change my sail for 1 hour? We have to go through an intermediate sail, is it useful?

Does the overlap coefficient cover these cases, and avoid this sail change and associated penalties?

ITYC.fr offers this tool allowing you to answer these questions in a few clicks!!!

This section is divided into 2 parts:

On the left, a curve representing the boat speed, the theoretical active sail and in automatic mode.

On the right you will find the settings.

You have to set your conditions on the right side to get an update of the curves.

It is mandatory to enter the start and end TWAs in the "correct" direction to get consistent results.

That is, if you find that your TWA slips from 120° to 130° , you absolutely must enter 120° in the start value and 130° in the end value.

If you find that your TWA slips from 130° to 120° , you absolutely must enter 130° in the start value and 120° in the end value.

In fact, the behavior of the sail cover is not identical depending on the sign of the TWA variation.

Sail curve

The curves represent boat speed in knots as a function of windward angle at the specified TWS.

The "Theo" curve represents the boat speed with the manually selected sail without regard to the overlap coefficient.

The "Auto" curve represents the boat speed with the sail selected automatically taking into account the overlap coefficient.

The hatched area corresponds to the overlap area of the sails.

For example,
A partir de 1 , le spi (vert clair), recouvrera le code 0 (en vert foncé).
Then part of the heavy spinnaker ( in dark red) from 2.
Finally from 3, the sail change will be effective, and the heavy spinnaker will be installed."

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

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

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

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

When hovering the cursor over the curve a toolbox like this one appears:

Wind angle (°).
Boat speed ( knots ), sail, sail cover gain if relevant.

Setting

To display the sail change curve, you will need to fill in the following different values:

Actual sail.

Wind speed (TWS).

Wind angle (TWA) at study start.

wind angle (TWA) at study end.

Reset zoom.

You can use the slider, the arrows on your keyboard, or enter the value directly to adjust the values.