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[Indian8or]

Arik,  I loosely followed the following diagram in my logic.


the downwash of air will somewhat cancel the acceleration plus the force of steam being emitted will make it rise somewhat before being dispersed into air.

the following diagram explains the movement of air around blades.

[Arik_the_Red]

Then, if I understand what I see in that diagram, the steam ought to pupp downward and into the area beneath the rotors? probably not just straight in, but being stirred around as the rotors whirl, and back up into the blades?  Maybe we can get a coast guard 'copter to set off a smoke flare from its tail sometime and show us what would really happen! 

[Indian8or]

Ha ha!  I agree or we can request the "how stuff works" guys to demonstrate.