To expand a little on previous post, and keeping it simple assuming
HTB is not a rotary driver...
1. Any helicopter can turn in the hover about any point inside the airframe, in front of it or behind it. Turns about points within the aircraft are conventionally called spot turns.
2. These are coordinated by the pilot as a combination of yaw and sideways movement, using appropriate controls, ie pedals for yaw and stick for sideways movement.
3. In different configurations (single rotor, twin rotor, coax, notar) the "appropriate controls" will do their work by different systems of "linkages, levers, push-pull rods and bell-cranks" or their hydraulic, electric, mechanical or computerised equivalents, but with substantially the same results.
4. This is an oversimplification, but my coloured chalks don't work on the computer .....
