An unmanned aerial vehicle includes at least one rotor motor configured to drive at least one propeller to rotate; and a micro hybrid generator system configured to provide power to the at least one rotor motor. The micro hybrid generator system includes a rechargeable battery configured to provide power to the at least one rotor motor; a small engine configured to generate mechanical power; and a generator motor coupled to the small engine and configured to generate electrical power from the mechanical power generated by the small engine. The unmanned aerial vehicle also includes a cooling system configured to couple to the micro hybrid generator system. The cooling system includes one or more plates; and a plurality of fins extending from each of the one or more plates. The cooling system is configured to dissipate heat from the micro hybrid generator system.