SotSS is a 4x/RTS mod based on the Universe of Freelancer/Starlancer
In Freelancer the Bloodhound was a light fighter used by the Liberty Rogues and the Mollys... however it's scale was waaaay off and it was actually more the size of a heavy fighter (and a fairly big one too)
So in SotSS the Bloodhound IS a heavy fighter, but is often mistaken as a light fighter because of it's agility.