Leading Edge
The leading edge is the lower front edge of the clubhead — the edge that touches the ball or the ground first at the moment of impact.
The English term literally means "front edge". Its counterpart is the Trailing Edge, the rear edge of the club sole. The leading edge determines whether the club glides cleanly under the ball or digs into the ground. On wedges it works closely with bounce: the bounce angle determines how much the edge is raised and how the club glides through sand or turf. Flat, sharp edges dig in more easily, high edges with plenty of bounce tend to skim off.
In practice, the leading edge explains two of the most common mishits. On a fat shot the edge hits the ground before the ball and digs in, and the ball stays far behind. On a thin strike the edge hits the middle of the ball instead because the club comes in too high, and the ball shoots away flat and uncontrolled. An example from the bunker: if you open the clubface and use the bounce, the leading edge glides through the sand underneath the ball. If you swing steeply into the sand with the leading edge, the club gets stuck and so does the ball in the bunker.
One common misconception is the ball too far back in your stance on firm or wet ground. This position brings the leading edge down too steeply and punishes every centimetre of error with a dug-in shot. Whoever plays on hard ground positions the ball more towards the middle and lets the edge run flatter through impact. When buying wedges it is worth a look at the sole shape, because grinds deliberately change the behaviour of the edge. If you understand what the leading edge does, you understand why the same swing produces completely different results on soft and on firm ground.
FAQ
Why does my club dig into the ground?
In that case the lower front edge of the clubhead hits the ground before the ball and digs in — the classic fat shot. This happens especially on firm or wet ground when the ball lies too far back in your stance, because that brings the edge down too steeply. Position the ball more towards the middle and let the edge run flatter through impact.
What does the leading edge have to do with bounce?
Bounce is the angle that lifts the leading edge at impact and determines whether the club glides through sand or turf or digs in. Plenty of bounce lets the edge skim off more easily, little bounce cuts in deeper. With the wedge in the bunker you use exactly that: with an open clubface, the edge glides through the sand under the ball.
How do I recognise a thin strike?
With it the leading edge hits the middle of the ball instead of passing underneath it, because the club comes in too high. The ball shoots away flat, hard and uncontrolled, often past the green. Typical sound: a thin, metallic click instead of a solid strike.