Battle Space 

R566 Satellite Launching Car

Serrated spindle engages in base of Satellite

Spring was wound up using the knurled knob. Claws on the knob engaged in the Satellite spline. When the trip lever hit the trackside switch, the spring was released and the blades spun actually providing the lift for the Satellite to fly.

Release trip-switch on Wagon

Trackside trip-switch