AdamFrisch,
This Web site should provide an understanding of the rotor, both teetering and rigid.
http://www.dynamicflight.com/aerodynamics/
The 'Absolutely' Rigid Rotor helicopter requires two rotors. This is so that the lift of the advancing side on one rotor is matched by the lift of the advancing side of the other,
counter-rotating, rotor.
Hope this helps.
Dave