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Intermediate

লাইন ড্রাইভ রেট

Also known as: LD%, লাইনার রেট

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.

লাইন ড্রাইভে যেকোনো ব্যাটেড-বল ধরনের সর্বোচ্চ প্রত্যাশিত ব্যাটিং গড় থাকে কারণ এগুলো জোরালোভাবে হিট হয়, নিরাপদে নামার মতো যথেষ্ট সময় বাতাসে থাকে, এবং ফিল্ড করা কঠিন। একটি অভিজাত LD% সাধারণত ২৫% বা তার বেশি বিবেচিত হয়। ব্যাটাররা তাদের LD% উন্নত করতে পারেন ব্যারেল পাথকে pitch সমতলে বেশি সময় রেখে অপ্টিমাইজ করে, রোলওভার কমিয়ে, এবং pitch-এর নিম্নমুখী গতিপথের সাথে মেলাতে অ্যাটাক অ্যাঙ্গেল উন্নত করে। ছোট নমুনায় ব্যাটিং গড়ের চেয়ে LD% প্রকৃত contact মানের বেশি স্থিতিশীল সূচক।

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

তার ২৮% লাইন ড্রাইভ রেট তার contact মানের সবচেয়ে স্পষ্ট সূচক ছিলো — সে ধারাবাহিকভাবে pitch সমতলের সাথে মিলিয়ে বল স্কয়ার করছিলো।

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

MLB Statcast glossary — Launch Angle (ground ball under 10°, line drive 10–25°)

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