Irimi Nage - Timing and Breath Throw

 

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Irimi Nage, also known as the Timing and Breath throw, uses several aspects of physics that were described in the Tenchi Nage and Kaiten Nage throws. Irimi Nage combines pivoting the Uke about an axis whilst also unbalancing them in a manner that will place them on the ground unharmed.

Initiating the technique is an overhead strike attack by the Uke. The Nage does not block or attempt to oppose the force of this strike, but instead uses a small force that is perpendicular to that force, pulling the Uke sideways and into a circle. Several things are happening at once at this point. Firstly, the Nage is maintaining very close contact with the Uke. By doing so, the two bodies orbit a central axis that exists within the Nage. If there was a greater space between the two, then both would pivot about a mutual axis that existed between them. By staying close to the Uke, the Nage can keep control of the Uke's spin.

Now we have a spinning Uke that is on the outside edge of a spinning body. By being farther from the center of the axis, the Uke's velocity is greater therefore his angular momentum is greater. Centripetal acceleration is also creating a force that is pushing the Uke towards the outside edge of the circle. Since there is nothing opposing the lower half of the Uke's body from moving outward under this force, the Uke's legs will fly out from under him. This destabilizes the Uke by now putting his center of mass outside of his body, and removing his legs from underneath him. All the while, the Nage is spinning along with the Uke, maintaining the momentum and keeping the Uke going in the direction that he's already going in (Newton's 3rd law).

To complete the technique, the Nage abruptly reverses the spin and brings his arm across the head of the Uke. The great amount of momentum that the Uke has will keep his body going forward, but his head is stopped. In my experience, most people are loth to part with their heads and will generally stay with them. However, the forward momentum of the Uke is too much for him to stay upright as his legs shoot out from under him and he falls to the ground.

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