NOTARs have a tail rotor, it is that fancy variable pitch fan inside the tail cone. They also have a mandatory stability system, and a full control system for the slot in back. There are by far more parts to go wrong, more handling problems, more wasted power with the Notar than with a regular tail rotor.. .. .OTOH, the Notar is much better protected so that the danger of a tail strike is almost nil (unless you bang up the rotating mechanism that diverts the air), and the Notar is quite a bit quieter than most tail rotors.. .. .The question is never as simple as "Do you want a Notar or not?" It is always stickier, and involves choices, such as "Do you want a Notar, or an extra passenger?" or "Do you want a Notar, or would you like to launch VFR without a SAS system?". .. .Let the customer decide!