China's new Z-21 heavy attack helicopter prototype is emerging as a direct capability competitor to the U.S. AH-64E Apache Guardian.

Like cursed penguins, a whole barrage of helicopter designs has failed to make it. From advanced stealth helicopters that cost billions, to sleek gunships and vast flying cranes that proved too much, ...

As the conflict in Vietnam raged, the UH-1 Huey was modified into a gunship, but the ubiquitous helicopter was slow and underpowered at times, thus prompting the need for a dedicated attack aircraft.