Grand Cannon

From Macross Compendium

Grand Cannon

Huge beam weapon whose energy is derived from Earth's gravity.
CHARACTERISTICS
Type: Land-based space defense beam weapon system
Duration of fire: 40 seconds
Outer diameter: 1 km
Inner diameter: 800 m (main shaft)
Depth: 5 km (main shaft)
Depth: 6 km (headquarters)
Elevation: 120 degrees