First, let’s look at how a dart flies. It travels along a parabolic trajectory, the same as a thrown stone or a bullet.
A dart flies along a parabolic trajectory.
The height of the curve depends on the force of the throw. A successful throw requires precisely guiding the dart along the parabola during the acceleration phase and allowing it to continue along this path after release.
To make the dart travel along the correct trajectory, first understand the mechanics of the arm: it’s like a “machine” composed of three levers connected by two joints and fixed to the body by one joint.
We’ve seen this diagram countless times, but have you truly understood it? The connecting joints are the elbow and wrist; the fixed point is the shoulder; the three levers are the upper arm, forearm, and hand.
Although the human arm can only trace parabolas within a limited range and perform simple movements, theoretically it can cover all possible parabolas. The image above shows the “aiming” position for throwing a dart; in the GIF below, you can see how the “levers” and “hinges” (joints) maintain the dart’s trajectory during a standard throw.
Now that the mechanical principles are clear, let’s discuss what to do and what not to do during the throw.
Regarding the Joints and “Levers”
Shoulder
The only point that should remain stationary throughout the entire process. Do not move your body during the throw; the movement should only come from the arm.
Elbow
Keep it in place during the backswing; it should begin to rise at a certain point during acceleration—this is crucial. You may have heard of “fixing the elbow,” but this is a misconception: fixing the elbow forces premature release. Just as a rifle is more accurate than a pistol because of its longer barrel, “longer guidance” makes the direction more stable, so the elbow must be raised during the later stages of the throw. Furthermore, after releasing the dart, the hand should follow the direction of flight, making the release easier and eliminating the need to find a single precise release point; even if the dart is released slightly early, it will maintain a good trajectory.
Wrist
Whether wrist movement is necessary is often debated. It’s not obvious in the animation, indicating that it’s not absolutely necessary. Most professional players use their wrists because it increases the terminal velocity: the movement of the three-part lever is like a whip, and a slight flick of the wrist can make the “whip tip” (the dart) move faster, while reducing the force required from the rest of the system, thus improving accuracy with less effort. However, wrist flicking introduces more variables and sources of error. Although commonly used by top-level and professional dart players, it is not recommended for beginners to try it prematurely. Therefore, shorten the movement first, maintain the trajectory, and do not change the content or order of the text.
