I am taking a page from the Anatomically Correct Series here. But instead of a living organism, I'd like to ask about a special kind of vessel.
I like ships. They are big and confortable. They have rooms for crew, for loot, for cargo and for dance parties. However, they don't usually fly high in the sky.
I like helicopters. They can hover in one place, they can take off vertically and they don't need strips of specially paved road orders of magnitude longer than them to land. However, they aren't really know for being spacious.
What I would really like to have is an aerial ship that flies by using propellers, as we see in so many different media and styles.
Why not a zeppelin, then? Because unlike a ship, a zeppelin will dedicate most of its precious volume for gas. I'd like to be space efficient here. Also I think that this more easily allows for an armored hull.
Now I have a feeling that the reason we don't do this is because it's not realistic. But I have to know. Could these be done? What would we need to change? If not with our current technology, then what would we need to develop to make it possible?
Also please notice that the two most closely related questions (this and this) that I could find are about airships that require lighter-than-air gases to stay afloat. As I said before, I'd like to avoid that requirement.