Abstract: An elongated body arranged to be mounted on a kite string for movements between an operator on the ground, and a flying kite on the far upper end of the kite string. A sail is mounted on the body for movements between an operative position wherein the same is wind propelled toward the flying kite, and an inoperative folded position wherein the plane of the sail is generally parallel to the kite string, permitting the body to descend the kite string by gravity. The sail is yieldingly urged toward its folded position, and releasable latch mechanism is provided to hold the sail in its operative position.