The use of jet thrust for anti-torque for monorotor small helicopters is based on the circulation control concept, which result in a distributed side force along the entire tail boom assembly.High velocity jets of air from a pressurized tail boom is blown tangential to the surface out of narrow slots that run lengthwise on the side of the tail boom.In combination with the downstream velocity produced by the main rotor, Coanda jets cause the flow to remain attached to the tail boom surface.The anti-torque NOTAR system is in fact the result of Coanda effect and the interest is to analyze the efficiency of replacing the tail rotor on a small monorotor helicopter.
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Cîrciu et al. (2010) studied this question.