Its best seen and shown,live if possible.
There are you tube clips.
I cant do justice to it to attempt to explain as Im still learning and it works best as part of a whole rather than on its own.If that makes sense haha.
Iv seen it explained as like how a horse runs,it tears up the ground with its hoofs using a cyclonic motion or circular motion.
Its fairly natural to do too.And of course its total body motion not just the arms,or there would be no power.
Its not Wing Chun and it can be done in a straight blast or not.You can go back,forward in all directions.
Its a sound principle.
Here is a clip on 'posting' on one side when puching which has bits about the cyclonic punching in it.http://www.youtube.com/watch?v=QDs47gQashQ