Skip to main content

Traduzione automatica. L’inglese è la versione di riferimento; miglioreremo il testo nel tempo. Hai notato qualcosa da migliorare? Faccelo sapere.

Intermediate

Percentuale di Linee

Also known as: LD%, tasso di linee

Definition

Line drive rate (LD%) is the share of batted balls that are line drives, launched at 10 to 25 degrees in Statcast's definition. Liners have the highest expected batting average.

Le linee hanno la media attesa più alta di qualsiasi tipo di palla battuta perché vengono colpite con forza, restano in aria abbastanza a lungo da atterrare in sicurezza e sono difficili da difendere. Un LD% d'élite è generalmente considerato pari o superiore al 25%. I battitori possono migliorare il proprio LD% ottimizzando il barrel path per restare sul piano del lancio più a lungo, riducendo il rollover e migliorando l'angolo d'attacco per farlo coincidere con la traiettoria discendente del lancio. Il LD% è un indicatore più stabile della vera qualità del contatto rispetto alla media battuta su campioni ridotti.

Tips by skill level

Beginner tip

During tee work, focus on hitting the back half of the ball. The part furthest from the pitcher — and drive it straight back through the imaginary pitcher's mound. This produces the contact geometry that generates the highest line drive rate.

Advanced note

Compare your LD% data across pitch velocity bands in your SwingVantage session reports. A significant LD% drop on high-velocity pitches confirms a timing cause. A consistent LD% decline across all pitch speeds confirms a barrel-path or contact-point cause that does not depend on timing.

Example

Il suo tasso di linee del 28% è stato l'indicatore più chiaro della qualità del suo contatto — faceva costantemente coincidere il barrel con il piano del lancio, colpendo pieno.

Why it matters

Line drives come from a bat path that matches the pitch and meets it squarely. Motion Lab estimates your attack angle and path tilt from your arm movement, but it does not track batted balls, so judge the results yourself.

How it shows up on video

On video, line drive production is associated with a barrel that arrives at the contact point on a matching plane to the pitch trajectory. This makes contact at or slightly above the ball's equator. Common errors that suppress line drive rate include a barrel arriving below the pitch plane (undercutting. This produces pop-ups), a barrel arriving from above the pitch plane (chopping. This produces grounders), and a barrel arriving after the optimal contact zone with the arms still bent (producing weak, pull-side flares rather than hard-hit drives).

Common mistakes

  • Confusing line drives with "contact hitting" and reducing swing aggressiveness in an attempt to make more contact — line drives require hard barrel contact, and pulling back swing intensity produces soft grounders and flares rather than true line drives
  • Using a barrel path that is too flat or downward across all pitch heights rather than adjusting attack angle to match specific pitch locations — middle-height pitches need a flatter approach than low-in-the-zone pitches
  • Treating LD% as a random outcome rather than a mechanical metric — over a sufficient sample, LD% is one of the most mechanically stable statistics available and should be used as a training target
  • Neglecting the attack angle dimension of line drive production and working only on barrel path without also verifying that the approach angle at contact is in the 10–25 degree window that produces true line drives rather than flat grounders

In SwingVantage Motion Lab

Motion Lab does not track the ball, so it cannot estimate your line-drive rate. It estimates your attack angle and bat-path tilt from your arm movement, the swing shape behind line drives.

Sources

Still have a question about Percentuale di Linee? Ask SwingVantage

Related guides & benchmarks

Work on the cause

Video shows how you move, not the ball itself. Film one swing to find the movement behind this result — free to start.

See a sample Baseball report first