The wind window
The wind or kite flying window is the space in which you can fly your kite. It is shaped like a quarter sphere in front of the kite flyer who has the wind behind him.
The wind window includes the part of the sky from the ground, to the left of the kite flyer, as far up as the zenith above his head and back as far down to the ground, to the right of the kite flyer.
The speed and power of the kite depend on the kite's position in the wind window.
The weak power zone:
The closer the kite goes to the edges of the window, the more power it will lose and the slower it will become. Landing the kite is more easily accomplished on this border.
At the zenith (above your head), the kite is said to be in the "safety" position. The kite lacks power and remains in the same position in the sky.
The maximum power zone
This is known as the power zone: this is the zone in which the kite has the most power. It is the ideal zone for taking off.