The Trackman V3 system uses Doppler radar technology to track the baseball’s flight and calculate its aerodynamic behavior.

Unlike camera-based systems, Trackman:

• Tracks the ball through its entire trajectory
• Measures velocity and movement in real time
• Uses flight data modeling to derive Spin Axis

Spin Axis in Trackman is inferred from ball movement, not directly observed. This makes system setup and tracking quality extremely important. 

What is Spin Axis?

Spin Axis refers to the direction the baseball is rotating around as it travels toward home plate.

It is expressed in degrees (0°–360°) and represents the tilt of the ball’s rotational axis. 

• 0° / 360° → Pure backspin
• 180° → Pure topspin
• 90° / 270° → Pure sidespin 

In simple terms, Spin Axis determines whether a pitch will: 

• Stay “true” (ride)
• Drop sharply
• Move laterally (cut or run) 

How Spin Axis Affects Pitch Movement

Spin Axis is directly tied to the Magnus effect, which is the force that causes a spinning ball to move through the air.

Different spin directions produce different movement profiles:

• Backspin (Fastballs) 
  • Creates upward force → less drop → “rising” effect
• Topspin (Curveballs) 
  • Creates downward force → sharper vertical break
• Sidespin (Sliders/Cutters) 
  • Creates lateral force → horizontal movement
• Tilted Axis (Most pitches) 
  • Produces a combination of vertical and horizontal break