Helicopters on Mars may sound like something from a science fiction novel — or perhaps just a typical "Doctor Who" episode. But actually, they're not fully confined to the world of sci-fi; after all, ...

Due to their hover and vertical takeoff and landing (VTOL) capabilities, helicopters possess distinct advantages over fixed-wing aircraft. Able to operate in tight spaces, isolated areas, and places, ...

Over the past few years, labels such as DJI have pushed drones into the mainstream. If you look closely, you'll notice that a majority of them have four propellers, while helicopters have fewer of ...