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📘 How does a sailboat move against the wind?

Follow sail lift, apparent wind, keel resistance, tacking, and current toward an upwind destination.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Wind direction
Sail as airfoil
Apparent wind
Keel
Rudder
Sail trim
Heel
Tacking
Gybing
Close-hauled
Lift and drag
Hull resistance
Wind shifts
Current
Safety
The complete beat

Questions this course answers

Why can a sailboat not sail directly into the wind?

A sail cannot maintain useful lift when the boat points directly into the wind.

What mainly resists a sailboat's sideways leeway?

The underwater keel develops an opposing hydrodynamic force.

What is apparent wind?

The moving boat changes the airflow direction and speed experienced by the sail.

What happens during a tack?

A tack turns the bow through the wind to change the boat's tack.

Why does a current matter to navigation?

Current moves the water relative to shore, altering the boat's track over the bottom.

Grounded in trusted sources

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