Angle d’attaque (frappe) (attack angle)

Attack angle is the mechanic behind launch angle. While launch angle describes what the ball does, attack angle describes what the bat does — and the bat's angle at contact shapes the ball's departure angle. A pitch arrives on a downward plane of about 6–10° below horizontal for a typical over-the-top delivery. A bat traveling at +5° to +12° upward meets that plane squarely and produces favorable launch angles for line drives and hard fly balls. The bat and pitch planes overlap for a generous window rather than crossing at a single point. This creates margin for timing errors without sacrificing contact quality.

A steep uppercut (well past +20°) is the most common attack-angle fault in amateur hitters who have been told to "swing for the fences." The barrel rises steeply through the zone. This creates a tiny contact window, and when it does make contact it catches the bottom quarter of the ball, imparting heavy backspin at a high launch angle — the recipe for pop-ups. A steep downward chop (negative attack angle) produces the opposite fault: grounders and swings over the top of the ball that misses entirely.

Attack angle is a cross-sport concept. In golf, attack angle describes whether the club is still descending or beginning to ascend at moment of impact. The optimal angle differs by club (negative for irons to compress the ball into the turf, positive for driver to launch the ball on an ascending arc). But the fundamental relationship between implement angle and ball departure is identical across both sports. Hitters who study golf biomechanics and golfers who study hitting often accelerate understanding of both disciplines because the underlying physics are shared.

Measuring attack angle precisely requires a high-speed camera or bat sensor with on-swing data. Visual proxies from regular video include whether the barrel is rising, level, or falling through the contact zone, and whether the hitter reliably catches the top, middle, or bottom of the ball. Pop-up patterns suggest too-steep an upswing; consistent top-spin grounders suggest a descending barrel.