Curling

Die Bahn :

Die 3 verschiedenen Möglichkeiten :

The Draw	A 'Draw' is obviously the most basic move. You send the stone down the sheet, and with the help of the sweepers and the direction of the skip, you somehow get the stone to stop where you want it. Here is shown a perfect draw into the Tee, the center of the House. This would be fairly pointless as a first shot, as it could easily be taken out.
The Takeout	Here, the green stone is taken out by the yellow. The yellow continues on, maintaining most of its momentum (usually takeouts are thrown harder than draws), while also knocking the green stone out of play. The yellow stone could, of course, remain in play if it remained in bounds, but in a basic takeout, the only concern is removing the other team's stone.
Guarding	Guarding is, as its name implies, placing a stone in front of another (with a draw) to prevent a takeout. In this diagram, we see two green stones and three yellow stones that have already been played. To protect stone A, the yellow team has sent a draw, stone B, immediately in front of A. This prevents a takeout by stone C as would have happened here.

Warum wird gewischt :

The Purpose of Sweeping

In the early days of curling, when games were played outdoors on the lochs, snow and other debris had to be cleared from the path of the moving rocks. Bunches of sticks were used as debris clearing devises. However, as the sport evolved, it became clear that, in addition to clearing debris, vigorous sweeping actually made the rocks travel farther and straighter.

The purpose of sweeping is twofold:

Why Rocks Curl

Before discussing the technical aspects of sweeping, it is crucial to understand what is happening underneath the rock as it travels down the ice. Curling rocks are approximately 12 inches in diameter; however, there is a ringed portion that the rock actually rides on. This ring is about 5 inches in diameter and is called the running surface.

Rocks are intentionally rotated either clockwise or counter-clockwise when thrown. Most rocks, if thrown without a rotation, will assume a rotation at some unpredictable point. Intentional rotation provides the necessary degree of predictability as the rock travels down the ice. As the rock is rotating, one side of the running surface will always be moving faster than the other as it travels over the ice surface.

Example: When a rock traveling down the ice has a clockwise rotation, the left side of the rock is traveling faster over the ice.

The running edge of the rock that is moving faster is known as the "outside edge" and the slower side is the "inside edge". Objects moving faster create more friction, so the faster edge has more friction than the slower edge. Because the fast side (the outside edge) has more friction, it causes more "frictional melting" of the ice. We also know that ice with water on it is more slippery than dry ice. This causes the rock to "bite" the ice more on the dry side causing it to "pivot" to the right. Therefore, a rock with a clockwise rotation will curl from left to right.

How Sweeping Works

The sweeping motion briefly polishes the ice just before the rock travels over it. This polishing is accomplished by warming the ice slightly, increasing the overall frictional melting, and allowing the rock to continue moving longer. This results in the rock traveling farther. This is technically defined as decreasing the rate of deceleration. The overall reduction in friction has another effect: Since the rock is biting less on both sides, the rock will travel straighter.

Sweeping cannot make a rock move faster, only farther!