Hi Monk
In answer to your first question, no they are not teetering hinged but yes they are two bladed.
The rotorheads on these 3D models are very stiff, as are the carbon fibre blades which limits the amount movement going on keeping everything very positive.
Unlike say a Robinson, there is no teetering hinge and no coning hinge, instead the blades are attached using vertical bolts allowing the blades to lead/lag but not cone and the rotorhead is attached directly to the mast with a bolt making it effectively rigid.
I believe (and I may be completely wrong) that if you were to translate the rotor speed of the model to a fuul size helicopter that the tip speeds would be way too high completely destroying the aerodynamics.
Hope that makes some sense...
PR