Full Swing – Rotation

Full Swing/Pitching data

Wrist Rotation

Rotation definition

Hackmotion sensor contains gyroscope which measures rotation of the lead wrist in global coordinate system. In contrast, local coordinate system measures wrist to elbow relationship.

This rotation metric can also be called “absolute rotation” as opposed to “relative rotation” of the wrist. So a body turn which rotates the wrist away from the address position will also influence the rotation and get measured.

Tiles - Snapshot values

To give a quick view of what is happening around impact we have calculated snapshot values. These values are not “positions” in golf swing, but instead amount of rotation between 2 swing positions. Please take a look at the graph below to see how the rotation values are calculated.

1. Amount of Rotation between P6 and Impact position.

For example, 52 degrees of rotation is wrist rotated from -76 degrees open before impact to -24 degrees open at impact (open relative to address position). 76 – 24 = 52 degrees

2. Amount of Rotation between Impact and P8 position.

For example, 66 degrees of rotation is wrist rotated from -24 degrees open at impact to 42 degrees closed after impact (closed wrist relative to address position). 24 + 42 = 66 degrees

3. Wrist Rotation Speed through impact (degrees per second)

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position P6 – Club shaft is parallel to ground BEFORE impact
position P8 – Club shaft is parallel to ground AFTER impact

Amount of Rotation between P6 position and Impact

Amount of Rotation between Impact and P8 position

Rotation speed through impact

Graph view - Full picture

Rotation graph shows the absolute rotation of the lead wrist in global coordinate system, taking the address position as its zero reference point and measuring the rotation relative to it.

During backwing the rotation is toward more open clubface position (negative graph value) while during downswing the rotation is towards more closed position (positive value). The body rotation during the backswing will also rotate the wrist relative to address.

The snapshot values in the tiles view measure the amount of absolute rotation before and after impact. For example the graph here demonstrates 52 degrees of rotation between P6 position and Impact and 66 degrees of rotation from impact to P8 position.