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Gunships are very effective in Supreme Commander 2, and the
Cybran Renegade is no exception. The gunship rush is most effective in team games. There are two basic types of rush - the quick rush and the long rush.
The goal of the quick rush is to cripple the opponent early. It consists of obtaining about 10 gunships by around 5 minutes in. This is done by pumping all research points into only the techs for gunships and by buildings only a minimal amount of infrastructure along with an air factory. Once the gunships are obtained they can be used to wreck an opponent's economy. It is a hard strategy to counter and will usually result in one opponent being set back economically for the rest of the game. If the enemy hasneglected his AA defenses completely you can even kill his commander and take him out of the fight.
The goal of the long rush is to obtain a "blob" of 40 gunships which are heavily upgraded. Those who use this strategy usually focus heavily on infrastructure in the early game. Research facilities are crucial because you'll be wanting to research all gunship upgrades including training, health, shields, damage, and rate of fire. The gunships can start pouring out at around 5 or 6 minutes in, although obviously they won't be fully upgraded at that point. Once they are fully upgraded, pick an opponent and wreck him. He'll be hard pressed to stop you before you annihilate his base or commander.