Quoting Richie "Richie2571" Collins
Y'Know, With a twin-rotor system like that, a tail rotor wouldn't be necessary. In Fact, It would actually be counterproductive. The reason being that, in a proper Twin-Rotor system the rotors spin in the opposite direction, canceling out eachother's torque.
Good point. I just though it would look weird without a tail rotor, maybe re-purposed to turn the vehicle faster? I dunno haha