Ro-Tor is responsible for reconnaissance. He isn't particularly fast in helicopter mode, but he has a tight turning radius and fantastic manoeuvrability. In addition he's almost soundless in flight, which allows him to sneak up on hapless Autobots and attack them from above. Ro-Tor likes to practice acrobatic flying in his free time. Ro-Tor combines with his fellow Combiners to form the giant robot Ruination.  (From Wikipedia)

An evil race of transforming robots known as the Destronger make their appearance known by invading a world exposition in New York and abducting Professor Onishi, a renowned scientist. The professor's son Yuuki befriends Fire Convoy and the heroic Cybertron forces, who will stop at nothing to rescue the professor and protect Earth from the wrath of Gigatron and his Destron henchmen.
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(Source: Anime News Network)