2 handed air baby technique

I understand that the hands need to be perpendicular to each other.

But how far apart should they be placed?

What are some good markers to use as guidance/reference? (For example, in a headstand, the hands should be about shoulder width apart and form an equilateral triangle with the head.)

 

Is there anything else I need to keep in mind? (example: strong protraction)

 

Pictures or diagrams would be much appreciated.

Each hand should be a few centimeters outside of SW. At least that's how I do it.

On 2 arms, think of it first as it is a regular frog stand(hands facing sideways, shoulder width or a little wider) with knee bent all the way back and only 1 knee on your elbow. The stronger and more stable you become, you first move up onto fingertips with the free arm. Then you start to place it more and more out diagonally in front of you until you can have only finger support while your arm is in front of you laterally. It tripples in intensity in your supporting shoulder as soon as you are aligned on a lateral line and of course gets even heavier once you are on 1 arm so be careful. You can also try to hold a bar in front of you or have your free arm on an elevated surface either on the side or in front to vary the intensity.

 

The shoulder positioning is quite intuitive and comes with practice. You re naturally externally rotating and protracting and this is what becomes harder when you move to 1 arm. Another key point to remember is to get a good placement of your knee on your elbow. 

Thanks for the clear, in depth response, Handbalancer.