Abstract: A lever having an inner impeller arm and outer actuating arm is pivoted to a portable platform. An adjustably fixed post is secured to the platform radially outward from the impeller arm. The post includes a concave surface which faces a convex surface at the end of the impeller arm. At least a portion of the surfaces are mutually congruent and spaced-apart a distance less than the diameter of a top spindle. The surfaces are resilient and grip the spindle so that relative movement between the surfaces will rotate the spindle and top. As the impeller arm is swung beyond the stationary surface, the top will be released from the surfaces and become propelled by the arm into dynamic flight.