[Phoenix-D]

"Is it possible to ram a ship but not destroy both ships? The Grav Lance was a ramming weapon, wasen't it?"

Not likely. The thing isn't a ramming weapon, just short-ranged, tempermental and a mass hog ('just')

Since the wedges extend for kilometers beyond the ship, ramming directly wouldn't even be needed. When the wedges hit, the ship with the weaker wedge has its engine rooms blown to bits by the interference.

Phoenix-D