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 (64A, 64B); 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 (64A, 64B); 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.