Here is something I found on another forum and thought you guys would find an interesting read.
"Wing Chun uses Crane footwork with Snake upper body theory, but only at the “deflection” combat range. There is a lot of crossover between snake and crane due to the natural progression of the systems. But the fundamental difference is the way in which each system treats force or power. The snake seeks contact at all times to inject and envelop the opponent. Wing Chun does not do this, and Crane seeks a bridge to deliver strikes. If you look at the White Crane Jin under Master Yang’s Ancestral/Sleeping Crane the power manifested from Jin is about force per square inch, or penetration. Which to me is more about flight paths (I’m still a novice with Master Yang’s Baihequan).
Snake Concepts
Structure (and unstructure)
Moment of Timing/Tempo
Spatial Line (centreline, spatial line, vital point, strongpoint)
Intention
Sensitivity
Wing Chun, like snake, actually straddles the spatial line to creation spatial tension to get better sensitivity of the centreline. The snake is all about sensitivity, contact, injection and envelopment. Wing Chun has aspects of this, but it is more like crane due to its striking nature rather than envelopment. Its footwork inhibits it from being circular, instead its about angles and straight line attack, which the snake is not.
What I was meaning was that it uses Crane footwork (or at least the theory behind it) and uses Snake upper body “deflection” range techniques. Ie - that it meets and deflects the opponents force at the spatial vital point (imagine a line between your solar plexus and your opponent’s (spatial line), the “balance point” between the two solar plexus is the spatial vital point).
Wing Chun straddles the spatial line to create a feeling or sensitivity for the space and the centreline, just like the snake. However, where the snake circles, Wing Chun practitioners do not. The instead use the footwork to create angles to the opponent like the crane.
I have thoroughly read Master Yang’s “Essence of White Crane” book, and other material I have found. Although I know Snake, I am only giving my opinions around Crane and its footwork theory. Correct me if you know better"