E175 is a 7 ton helicopter, meaning its maximum take off weight is 7 tons. Empty weight isnt listed but it could be around 3.5 tons.
Blackhawk weight little under 5 tons empty and its mtow weight is some 10.5 tons.
Mi-17 weighs some 7 tons empty and its mtow is some 13 tons.
So those three are definitly each in its own class. Z15/e175 will definitely be a huge step up in the asw role and utility role, replacing z9 series (z9 being 2 tons empty and 4 tons mtow), but it wont quite be what blackhawk is. That being said, US doesnt really use anything in the mi17 class so it may be china will just take another road and skip the 10 ton class helo and replace it with two classes, one a bit lighter (z15) and one a bit heavier (mi17 or z8)
Blackhawk weight little under 5 tons empty and its mtow weight is some 10.5 tons.
Mi-17 weighs some 7 tons empty and its mtow is some 13 tons.
So those three are definitly each in its own class. Z15/e175 will definitely be a huge step up in the asw role and utility role, replacing z9 series (z9 being 2 tons empty and 4 tons mtow), but it wont quite be what blackhawk is. That being said, US doesnt really use anything in the mi17 class so it may be china will just take another road and skip the 10 ton class helo and replace it with two classes, one a bit lighter (z15) and one a bit heavier (mi17 or z8)