 The final version of the Bat takes its design cues from the Harrier Jump Jet, Bell Boeing V-22 Osprey and the Boeing AH-64 Apache.Chris Corbould described the Bat's size and shape as presenting a major challenge for filming given Christopher Nolan's emphasis on practical effects over computer-generated imagery.In order to make the Bat "fly", it was variously supported by wires, suspended from cranes and helicopters, and mounted on a purpose-built vehicle with hydraulic controls to simulate movement.