You are here

GRID FINS

Falcon 9’s first stage is equipped with hypersonic grid fins which manipulate the direction of the stage’s lift during reentry. The fins are placed in an X-wing configuration and are stowed on ascent and deployed during reentry. While the fins are relatively small – they measure just 4 feet by 5 feet – they can roll, pitch, and yaw the 14-story stage up to 20 degrees in order to target a precision landing.