I really like these helicopters, they manage to look brutal and agile at the same time. As for rotors, I just assumed it used a NOTAR system to keep torque neutralized. NOTAR being a system for using thrust from the engine rather than thrust from a tail rotor to counteract the torque from the rotors.
I am Kun, member of a start up company ravenworks. We are planning to develop a turn base modern war game with a bit of manga twist. I will need to illustrate 15 types of units for each of the items such as BMT tanks, APC, infantry, attack helicopters, artillery etc. There will be a hundred of illustration needed. Can you contact me on email@example.com.
The AFH-02B Hellhound is equipped with a ducted fan that blows air through its tailboom and out of some slots on the right side. scope-eye DOT net/misc/Patlabor_2_DVD_Hellhound_lineart.jpeg (See also wikipedia entry for NOTAR)