Let's talk about Physics and the Art

[Dave Lorenson]

  Hi Dave,

Thanks for your reply.  Yes, I would tend to agree, depending on the opponent's response that it could be a class 2 lever - yet, it's interesting because the effort and the load are at almost exactly the same place until the hip locks.  So it would most definately change to a class 3 lever as soon as the hip locks into place during the takedown.

And...yes it is a great lesson, it's a powerful takedown.

As far as feeling how and why leverages and any lessons work - I agree with you, one cannot understand until it is experienced at least on some level.  My sifu has this to say, "Contact changes everything."

Have a great day!

With Respect,

David Lorenson

[Sansoofu]

I was checking out the second leverage that John puts on Billy's right arm & shoulder on the November Ceremony video on this site.  John starts the technique defending a right punch from Billy with left up windmill block that he follows through into a strike, then he rolls it into a throw and applies the leverage.  In the leverage, John has his left arm wrapped around Billy's right arm with his radius applying pressure up under Billy's right humerus (under the triceps) and grabbing onto his own right forearm (called a key lock in some arts [and similar to the first leverage that he does to Billy's right arm on the same video]).  Billy's right forearm is trapped at the left side of John's body and John's weight is grounded by pushing down onto the right side of Billy's neck.   Would anyone care to explain the load, effort, fulcrum of this leverage please?  It is getting late and my brain is beginning to shut down from a long day.

Thank you,

M.

[Dave Lorenson]

M,

This is a good question as the leverage changes progressively through the move.  It ends with your description and this is my observation:

John, (in black and executing the lesson, if I understand correctly), is using his left forearm as the fulcrum.  The effort is on Billy's right hand and the load is Billy's body.  The load in this case is trapped, so the the load arm is most likely the first thing to give way.  The second possibility (though unlikely to happen) is that the hand supplying the effort will give way and the leverage will be lost.

Great lesson.

With Respect,

David Lorenson