A rotor assembly for a rotary wing aircraft comprising: a plurality of rotor blades operably connected to a rotor shaft ; and active adaptive devices disposed at one or more rotor blades of the plurality of rotor blades , the active adaptive devices operably connected to an aircraft flight control system such that, when activated, the active adaptive devices change one or more operational characteristics of the rotor assembly , characterized in that the active adaptive devices include: a spar air duct extending along the one or more rotor blades , the spar air duct including an inlet , disposed at or near a root of a trailing edge of the rotor blade , and an outlet , disposed at or near a leading edge of the rotor blade ; a valve configured to selectively turn on an airflow through the at least one outlet for a first mission and turn off an airflow through the at least one outlet for a second mission; and a tip jet outlet disposed at a blade tip of the one or more rotor blades , the tip jet outlet connected to the spar air duct , wherein the rotor assembly is configured to selectively urge airflow through the spar air duct out the at least one outlet to increase lift of the one or more rotor blades in the first mission, and to selectively urge airflow out the tip jet outlet to reduce noise of the rotor assembly in the second mission. a plurality of rotor blades operably connected to a rotor shaft ; and active adaptive devices disposed at one or more rotor blades of the plurality of rotor blades , the active adaptive devices operably connected to an aircraft flight control system such that, when activated, the active adaptive devices change one or more operational characteristics of the rotor assembly , characterized in that the active adaptive devices include: a spar air duct extending along the one or more rotor blades , the spar air duct including an inlet , disposed at or near a root of a trailing edge of the rotor blade , and an outlet , disposed at or near a leading edge of the rotor blade ; a valve configured to selectively turn on an airflow through the at least one outlet for a first mission and turn off an airflow through the at least one outlet for a second mission; and a tip jet outlet disposed at a blade tip of the one or more rotor blades , the tip jet outlet connected to the spar air duct , wherein the rotor assembly is configured to selectively urge airflow through the spar air duct out the at least one outlet to increase lift of the one or more rotor blades in the first mission, and to selectively urge airflow out the tip jet outlet to reduce noise of the rotor assembly in the second mission. a spar air duct extending along the one or more rotor blades , the spar air duct including an inlet , disposed at or near a root of a trailing edge of the rotor blade , and an outlet , disposed at or near a leading edge of the rotor blade ; a valve configured to selectively turn on an airflow through the at least one outlet for a first mission and turn off an airflow through the at least one outlet for a second mission; and a tip jet outlet disposed at a blade tip of the one or more rotor blades , the tip jet outlet connected to the spar air duct , wherein the rotor assembly is configured to selectively urge airflow through the spar air duct out the at least one outlet to increase lift of the one or more rotor blades in the first mission, and to selectively urge airflow out the tip jet outlet to reduce noise of the rotor assembly in the second mission. <EOS>