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Tricopter/penta-copter (dragonfly) counter clockwise rotating props?

Dear Community,

It has been a while since my last visit here (2012), but finally I found/made the time to get into multirotors. Beginning where I left off: http://forum.flitetest.com/showthread.php?1837-wich-one-should-I-choose-tri-or-quad.

I decided I first build an tri-copter and after I learn how to fly it in a decent way, I am planning to transform it into a penta-copter dragon fly style.

Before I buy motors/props, I have a question about the rotation of the motors. I always thought that tricopters fly with al props rotating in the same direction. However today I watched a video in which David showed this picture:

tricopter rotation.PNG

So now I am confused, perhaps someone could explain this in more detail?. I am also wondering which way the props should rotate by the down-faced motors when I convert the tricopter to pentacopter/dragonfly.

I need to know this before hand because the motors I am planning to use ship with self tightening prop-stops which only work in one direction.