In designing the Bat, Nathan Crowley approached it as if it were an actual military project, emphasising the need for it to "fit into the same family" as the Tumbler and the Batpod. 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.[11] 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.[11][12][13]