Abstract: The present invention is a variably convergent exhaust nozzle includes a ring, pluralities of first inner leaves, second inner leaves, lever-arms and hinges and a cable for use with a ducted fan unit and a driving mechanism. The ring has a peripheral edge. Each of the first and second inner leaves is formed out of a semiflexible material and has a first and end and a second end. The first and second inner leaves are distributed along the peripheral edge of the ring. The first leaves are fixedly coupled to the ring at their first ends. The second inner leaves overlap the first inner leaves. The first end of each second inner leaf is fixedly coupled to adjacent first ends of the first inner leaves. Each lever-arm contacts one of the first inner leaves. The hinge pivotally couples each lever-arm to the peripheral edge of the ring so that each lever-arm may pivot adjacent to the first end of one of the first inner leaves in order for its second end to press against the second end of one of the first inner leaves.