NOVELTY - The device (10) has two rotors (11,12) attached to a support structure (6) having the axes of rotation (3) parallel to each other on a plane perpendicular to a fluid. Blades (21,22) are attached to each rotor where a swept area formed by the blades of one rotor intersects with the swept area formed by the blades of opposite rotor. The rotors rotate relative to each other in synchrony by a synchronizing mechanism (4) where the blades of opposite rotors are not collided with each other in the rotation. An electric machine (5) is attached to the structure and connected to one of the rotors.    USE - Cross-flow axes rotary mechanical (CARM) device such as lift turbine, wind turbine, hydro turbine, propeller, fan-blower, pump-compressor and mixer with dynamic increased swept area (DISA).    ADVANTAGE - As the turbine have different blade foils per rotor, all the energy on the up flow portion where there is less fluid flowing through devices are extracted and the need for a symmetric foil getting lift on the down flow portion is eliminated and hence the stress forces on the blades are not varied from compressional to tensional for each revolution. The blades of the opposite rotor are configured for decreasing the negative drag forces, while for the drag type devices the blades rotating against the fluid direction reduce their shape hence decreasing the negative drag force. The increase of the energy extracting/exerting portion of the swept area results in processing more fluid by the CARM devices with DISA or less fluid escaping from the devices. The electric machine such as an electric motor which is adapted for exerting energy to the fluid creates different type of CARM devices with DISA, such as cross-flow axes propeller with DISA, cross-flow axes fan-blower with DISA, cross-flow axes pump-compressor with DISA and cross flow axes mixer with DISA.    DESCRIPTION OF DRAWING(S) - The drawing shows an axonometric view of a cross-flow axes lift turbine with DISA.    Axes of rotation of rotors (3)    Synchronizing mechanism (4)    Electric machine (5)    Support structure (6)    Cross-flow axes of rotary mechanical device with DISA (10)    Rotors (11,12)    Blades (21,22)