All propellor driven tunnels cavitate out of the hole...........it is a characteristic of the tunnel bottom design. This is why the Allison Drag Boats are so successful on the O/B drag circuit, (V-Bottom = NO Cavitation). I have never had any experience with a Black Hawk Drive, but I do know that it is a surface piercing drive and thus I would expect it to cavitate even more than say a standard bravo due to the white wash water near the surface. If the boat is solid and you like it, and can deal without pulling skiers, I would say go for it. In my experience no tunnels pull skiers well. Good Luck.