Stuff Goal Projector
Pitch physics, both directions — metrics → movement and movement → metrics.
Inputs
°
gyro
?
: 8%
Changes the seam pattern shown on the ball. With SSW on, this presets a typical wake direction for the grip.
°
SSW is approximate — seam orientation isn't measured, so this is a coach-set offset layered on the physics.
Target movement
Enter the break you want; the tool solves the spin axis & efficiency needed (at the velocity/spin above). Or just drag the ball.
Spin axis & airflow — drag the ball to tilt
travel direction
airflow (curves toward Magnus force)
Movement
small, realistic tweaks to enhance this pitch
—
Induced vertical
ride
ride
—
Horizontal
arm side
arm side
Spin-axis vs observed tilt
?
—
spin-axis
measured
measured
→
—
observed
movement
movement
—
gap
SSW
SSW
| Spin efficiency used | — |
| Total spin / transverse | — |
| Approx. pitch type | — |
| Movement source | — |
Non-Magnus breakdown approx
| Magnus alone | — |
| Seam / SSW effect | — |
| Non-Magnus share | — |
Break plot (horizontal vs. induced vertical, with pitch-type clusters)
Movement is computed by numerically integrating the release-to-plate trajectory (Magnus from transverse spin, drag, gravity), with induced vertical break measured gravity-subtracted against a no-spin reference. SSW is an approximate add-on. Benchmarks: 2025 MLB Statcast. This is a physics estimator for development planning, not a measurement.