Sikorsky was one of the first to cant the tail rotor. At the time Sikorsky believed correctly that the Canted Tail Rotor provided additional vertical lift at a very small total increase in tail rotor power required. If one looks at the law of cosines. Canting the tail 20 degrees reduces the anti-torque thrust by 34% (sine of 20 degrees) thus requiring addition scale up of the tail rotor for anti-torque. At the same time the cosine of 20 degrees provides for 94 % of the thrust going to lift. In essence the tail rotor is carrying its own weight. Other manufacturers are following Sikorsky’s lead on this.