Skip to main content

Traduction automatique. L’anglais fait référence ; nous affinerons la formulation au fil du temps. Une suggestion ? Dites-le-nous.

Beginner

Lancer illégal

Definition

Un lancer illégal est toute livraison qui enfreint les règles : le plus souvent un lancer hors de la fenêtre d’arc légale, une balle lancée avec effet ou un relâchement depuis une position illégale.

Les infractions courantes de lancer illégal au slow-pitch comprennent : un arc trop bas (sous 6 pieds / 1,8 m) ou trop haut (au-dessus de 12 pieds / 3,7 m) ; imprimer un effet intentionnel (tourner brusquement le poignet au relâchement) ; une livraison à deux mains ; ou lancer depuis l’extérieur du caoutchouc. Quand un lancer illégal est déclaré, le frappeur peut prendre le lancer comme une balle ou choisir de s’élancer. Les lanceurs apprennent à lire les tendances de l’arbitre et à ajuster leur arc pour rester légaux et protéger leur équipe des comptes offerts.

Beginner tip

If an umpire calls your pitch illegal, ask specifically which rule was violated — arc, speed, or release — so you can fix the correct issue rather than changing the wrong thing.

Advanced note

Film your practice pitches from the side with a reference marker at 6 and 12 feet to build a visual library of your arc heights across different speeds and effort levels.

Example

Le lancer monte à 14 pieds (4,3 m) — bien au-dessus du maximum — et l’arbitre signale immédiatement « lancer illégal », accordant une balle au frappeur.

How it shows up on video

An illegal pitch is identifiable on video by comparing the ball's peak height against a known reference. A flat delivery that never visibly rises above the batter's helmet is almost certainly below 6 feet. A spin-enhanced pitch shows rapid rotation visible as a visible seam blur or an unusual lateral curve that a standard arc would not produce. The umpire's call is definitive, but video review helps pitchers self-diagnose between games.

Common mistakes

  • Throwing too hard and flattening the arc below 6 feet in the excitement of a key at-bat, the most common illegal-pitch type in competitive slow-pitch
  • Adding wrist-snap to generate extra spin for movement, not realizing the association classifies intentional spin as an illegal pitch
  • Failing to come to a complete stop with both feet on the rubber before starting the delivery. This some associations classify as an illegal start position
  • Pitching from the wrong distance after moving to a different league, unknowingly using 46-foot mechanics from a 50-foot rubber or vice versa

In SwingVantage Motion Lab

SwingVantage can flag pitch deliveries where the estimated arc height falls below the 6-foot threshold from video analysis. This gives pitchers objective feedback to self-correct before a game situation.

Still have a question about Lancer illégal? Ask SwingVantage

Related guides & benchmarks

Put this into your swing

SwingVantage can spot this in your own swing — free to start.

See a sample Slow-Pitch Softball report first