Thanks to Tony Fritze, additional details about The Bat
from The Secret Files
The Bat: This is a mobile flying vehicle capable of handling tight maneuvers around and between Gotham's buildings and skyscrapers. Dual propellers on the underside of the aircraft create a vortex that lifts the vehicle straight up into the air. These spinning blades are so powerful that they can knock down bystanders. The Bat's autopilot feature allows it to hover quietly, enabling Batman to stay hidden in the city's toughest neighborhoods.
Side panel rocket launchers can break through solid rock or metal. Mounted floodlights on either side used to illuminate dark areas, two-person cockpit, anchored machine guns, EMP rifle guidence mounted.