The Tri-Rotor is a Drone like machine featured in Tom Clancy's Splinter Cell Blacklist. This gadget is given to Sam by Charlie. He can control the Tri-Rotor from his OPSAT once deployed.
It can be used by Sam to do multiple Tasks such as:
-Stalk enemies from a distance (when upgraded you can use Sonar vision to detect them), sometimes the Tri-Rotor has to be used as recon tool while the path is not accessable by player.
-Knock out multiple enemies, the upgraded Tri-Rotor has 4 shocker arrow equipped, once the Rotor is close enough, Sam can use the explosive to kill enemies.
-Disable electronics from a distance, the Tri-Rotor can be used against electronic devices, via its EMP charge upgrade. The Tri-Rotor can only use one kind of explosive at a time, either this or the C4 charge that kills the enemy.