They are formed when Meks and enterprising Deathskulls, secure the wrecks of downed Ork aircraft. Should the fuselage be relatively intact, the more speed-crazed Meks will merrily weld it together with tracks, engines, guns, and the largest drill or cutting tool they can find. The Meks happily construct these vehicles despite the fact that the wreck could have been rebuilt into another aircraft instead of a ground vehicle.

A favorite amongst Speed Freeks