Helicopters are air units with unique properties.
- Helicopters do not need to refuel, however they lose hitpoints every turn they are not in a city, an airbase or a carrier
- Helicopters will end their turn if they fly over a city, an airbase or a carrier
- Because they are air units, they can travel over oceans or the land with equal speed
- Helicopters ignore terrain effects, but they cannot take advantage of roads or railroads
- Helicopters ignore city walls when attacking cities.
- Helicopters can capture cities
- Unlike fighters, helicopters end their turn after they attack.
- Fighters have a 2X attack bonus against them
- Helicopters can be attacked by land or sea units
- Helicopters have a sight radius of 2 tiles and can see submarines.
The concept that was to become the modern helicopter was first explored by artist/engineer Leonardo da Vinci. He made sketches of a rotor-driven aircraft in the early 16th century. It was not until 1939, however, that the first practical helicopter design was developed. Helicopters have a distinct advantage over fixed-wing aircraft in that they can take off and land vertically. This makes it possible for helicopters to operate in many places that would be too small to accommodate a runway. Today, helicopters are used in civilian roles as rescue vehicles and by law enforcement agencies. All branches of the military utilize many different types of helicopters, from giant cargo and troop carriers to fast and maneuverable gunships used as air support for ground troop operations.
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