GEN H-4 is a small manned helicopter with coaxial counter-rotating rotors. That the wings of the upper and lower blade is rotated in the opposite direction, you can cancel out the anti-torque generated by the rotor of each other, and stable fly. The control bar at the front of the pilot, by tilting the rotor rotational plane, you will be able to move back and forth, side to side.
It is also possible to generate the differential rotation of the rotor of the upper and lower turning on the fly. Four engine has gained a proprietary GEN 125 (horizontally opposed engine of 125cc).