Thread:Montonius/@comment-3580035-20120622072302/@comment-3580035-20120623022649

Its in the Tau Codex 4th Edition. Under the unit profile on page 36, it says

Type: Tank, Skimmer

It also makes sense to be a tank, seeing as the Hammerhead and Skyray are based of the same chassis, but with different turret options.