Abstract: A fin construction for small missiles that includes two members that are otally secured together at one end with the other end of one of the members being pivotally secured to a structure and the other end of the other member being slidably mounted on a rod with tension springs biasing the two members together to form a generally triangular shape of a fin. The two members are maintained in a flattened out relation inside an opening of the missile housing by securing means around a plurality of the fins located around the periphery of the missile which securing means maintains the fins in a retracted position until the missile is launched from a launch tube at which time the securing means is removed to allow the tension springs to bias the fin members into a triangular fin shape for stabilizing the rocket.