The Corsair is an air to air unit only, it rapidly fires a 5 damage weapon againsst any air foolish enough to cross it's path and is almost as effective as the Scout in air to air combat. the corsair does have one very effective ground weapon that you can upgrade at the fleet beacon that goes by the name of Disruption Web. What this does is when used against ground defense buildings like Photon Cannons or Sunken and Spore Colonies..... it will temporaroly make them harmless and will keep them from attacking. This could be very handy if you use this on an enemy's front line of defense and use a big attack group to take out the inside of the base. If you upgrade corsair energy capacity at the fleet becon and let a corsair get full energy you can use Disruption Web twice without waiting..