A fluid modulator for an aircraft engine cooling system comprising a duct and a plurality of dividers extending parallel to each other and arranged across the duct , wherein each divider comprises: a first flap including a first knuckle and a first leaf extending downstream from the first knuckle ; a second flap including a second knuckle and a second leaf extending downstream from the second knuckle ; and a pin extending through the first and second knuckles , the pin providing an axis of rotation for the first and second flaps ; characterized in that : the first flap includes a first stem that extends through the duct , and the second flap includes a second stem that extends through the duct on an opposite side from the first stem , wherein the first stem is connected to a first tab that extends away from the axis of rotation, and the second stem is connected to a second tab that extends away from the axis of rotation; the first tab is rotatably connected to a first linkage , and the second tab is rotatably connected to a second linkage ; the first linkage is rotatably connected to a third tab and the second linkage is rotatably connected to a fourth tab ; and the third tab is connected to a first shaft of a first motor such that the first motor controls the position of the first flap , and the fourth tab is connected to a second shaft of a second motor such that the second motor controls the position of the second flap . a first flap including a first knuckle and a first leaf extending downstream from the first knuckle ; a second flap including a second knuckle and a second leaf extending downstream from the second knuckle ; and a pin extending through the first and second knuckles , the pin providing an axis of rotation for the first and second flaps ; characterized in that : the first flap includes a first stem that extends through the duct , and the second flap includes a second stem that extends through the duct on an opposite side from the first stem , wherein the first stem is connected to a first tab that extends away from the axis of rotation, and the second stem is connected to a second tab that extends away from the axis of rotation; the first tab is rotatably connected to a first linkage , and the second tab is rotatably connected to a second linkage ; the first linkage is rotatably connected to a third tab and the second linkage is rotatably connected to a fourth tab ; and the third tab is connected to a first shaft of a first motor such that the first motor controls the position of the first flap , and the fourth tab is connected to a second shaft of a second motor such that the second motor controls the position of the second flap . the first flap includes a first stem that extends through the duct , and the second flap includes a second stem that extends through the duct on an opposite side from the first stem , wherein the first stem is connected to a first tab that extends away from the axis of rotation, and the second stem is connected to a second tab that extends away from the axis of rotation; the first tab is rotatably connected to a first linkage , and the second tab is rotatably connected to a second linkage ; the first linkage is rotatably connected to a third tab and the second linkage is rotatably connected to a fourth tab ; and the third tab is connected to a first shaft of a first motor such that the first motor controls the position of the first flap , and the fourth tab is connected to a second shaft of a second motor such that the second motor controls the position of the second flap . <EOS>