1. 3-minute Start

a. Flags at T-3.00, T-2.00, T-1.00, and T-0.00

2. Standard triangle race course:

a. Round all marks to port. Finish between the RC boat and the pin.

The 2026 ILCA World Championships — featuring both the ILCA 7 Men’s and ILCA 6 Women’s fleets — will be held at Dún Laoghaire, Ireland, on the waters of Dublin Bay. The event runs from late August to mid‑September 2026, with sailors from around the world competing for world titles.

Average coastal breezes in Dublin Bay often hover around 10–12 knots, providing ideal conditions for tactical dinghy racing. However, like all open‑bay venues, these winds can fluctuate with gusts, shifts, and lulls throughout the day. Competitors should anticipate both steady trade‑style breezes and local variability that will test sail trim, helm control, and tactical choices.

Dún Laoghaire’s racing areas are exposed to the open Irish Sea, where afternoon sea breezes and frontal weather systems can contribute to changing wind patterns. Waves and tidal currents on Dublin Bay also play a role in strategy and boat speed, making local conditions dynamic and challenging.

The wind condition will be announced at the start of the race.

On a Laser/ILCA, many controls affect how the boat performs, but the most important control is the sheet. The sheet determines how tight the sail is trimmed to the wind, and it has a dramatic effect on speed and balance.

Key points about the sheet:

• Too tight: The sail over-flattens, airflow detaches, and the boat slows down. On a beam reach (~90° TWA), tightening the sheet to 15° or less is too aggressive.
• Optimal trim: Slowly easing the sheet while watching boat speed reveals the sweet spot. On a beam reach, your observations show 50–55° gives maximum speed (~8.5 knots in 10 kt wind).
• Too loose: The sail spills wind, reduces driving force, and the boat slows again. Beyond ~55° on a beam reach, speed decreases.

Other controls (outhaul, vang, traveler, rudder) are important for fine-tuning balance and pointing ability, but without proper sheet trim, the boat will not reach its potential. In short:

• Sheet is king: Trim it for clean airflow and maximum speed according to point of sail.
• Outhaul: Adjust for wind strength — more tension in heavy winds, less in light winds.
• Tiller: Steer smoothly — avoid oversteering, which reduces speed due to turn drag.

Remember: learning to read the boat’s response as you adjust the sheet is the fastest way to sail efficiently and safely.

Source: Polar diagram (sailing) — Wikipedia

Outhaul

• Function: Controls the bottom edge and the depth (belly) of the sail.
• Optimization: Leave roughly a "hand span" of space between the sail and the boom. This creates the ideal balance of drive and boat control.

Cunningham (Downhaul)

• Function: Controls the tension on the front edge (luff) and the upper part of the sail.
• Optimization: Pulling it tight flattens the top of the sail to "shed" power when you are overpowered. In lighter winds, use just enough tension to smooth out vertical creases.

Boom Vang (Kicker)

• Function: Holds the boom down and bends the mast to flatten the mid-section of the sail.
• Optimization: Essential for gusts. Proper tension allows you to ease the mainsheet without the boom rising, preventing the sail from accidentally powering up when you're trying to depower.

Watch this guide to master Laser Sail Tuning for medium winds. These adjustments are critical for the 3-minute setup phase before your race begins.

To master the Laser, you must manipulate the sail's shape to balance Lift and Drag. The Outhaul is your primary tool for controlling the "lower gear" of the boat by adjusting the Camber (depth).

The Mechanics of Camber

• Loose Outhaul (Deep Camber):
  Generates maximum power (Lift) for light winds or downwind.
  Penalty: Increases Induced Drag. In heavy air, this causes excessive heeling (tilting) rather than forward motion.
• Tight Outhaul (Flat Camber):
  Reduces drag and allows the boat to point higher upwind.
  Penalty: In light air, a sail that is too flat will Stall, causing a total loss of drive.

This sailing simulation app uses a simplified but realistic performance model based on publicly available information about the ILCA / Laser class and standard sailing theory. The goal of this model is to remain intuitive, transparent, and defensible rather than perfectly hydrodynamic.

Wherever possible, real-world sources are cited so that players can explore the underlying data themselves and understand how the simulator behaves.

Primary Sources:

• International Laser Class Association (ILCA)
  Official class information, rules, and equipment specifications.
  https://ilcasailing.org/
• Polar Diagrams (Sailing Theory)
  Explanation of polar curves used to model boat speed vs. wind angle.
  https://en.wikipedia.org/wiki/Polar_diagram_(sailing)
• Laser / ILCA Performance Discussions
  Community-based observations of Laser speeds across points of sail.
  https://sailingforums.com/threads/laser-speeds.175/

Because official Laser polar curves are not publicly published, this simulator uses a simplified reference polar that reflects commonly accepted performance ranges for an ILCA dinghy in moderate wind.

Simplified Polar Reference Used in This Simulator:

These values are not intended to represent maximum theoretical performance. Instead, they form a stable reference curve that rewards correct trim, penalizes poor trim, and produces believable behavior for a single-handed dinghy.

Section 3: Physics uses this table as its backbone and applies gradients for sail trim, tiller movement, wind oscillation, and inertia to produce smooth and realistic motion.

If you disagree with any performance assumption, please consult the sources above or email the developer at ggala@hotmail.com . This simulator intentionally favors transparency over hidden formulas.