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Intermediate

라인드라이브 비율

Also known as: LD%, 라이너 비율

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.

라인드라이브는 강하게 맞고, 안전하게 떨어질 만큼 오래 공중에 머물며, 수비하기 어렵기 때문에 어떤 타구 유형보다 기대 타율이 높다. 최상급 LD%는 일반적으로 25% 이상으로 여겨진다. 타자는 배럴 패스를 최적화해 pitch 플레인에 더 오래 머물게 하고, 롤오버를 줄이고, pitch의 하강 궤적에 맞춰 어택 앵글을 개선함으로써 LD%를 향상시킬 수 있다. LD%는 작은 표본에서는 타율보다 진짜 컨택트 품질을 더 안정적으로 보여주는 지표다.

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

그녀의 라인드라이브 비율 28%는 컨택트 품질을 가장 명확히 보여주는 지표였다. 그녀는 꾸준히 pitch 플레인에 맞추고 정타를 날리고 있었다.

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

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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