Actuator subsystems:
The control surface ( flippers ) are spring loaded and extend upon leaving the tube.
Upon extension, an electrical squib valve (small explosive device) is actuated which punctures the diagram of a pressurized bottle containing 6,400 psi of helium gas to power the flippers.
Four solenoids ( one for each flipper ) are individually controlled by the electronics section. The solenoids allow the helium gas to extend or retract a piston which moves each flipper at 25 cycles per second (CPS) for 4.325 seconds, then reduces to 12.5 CPS for conservation of the helium gas.
Each piston is connected to the control surface actuator by a shaft ( push-pull tube ).