Blue Thunder's signature aircraft looked like a heavily armed futuristic machine, but the apparent stunt capability of the on-screen helicopter concealed a serious practical problem. The filmmakers had modified two Aérospatiale SA-341G Gazelles with bulky bolt-on armor, Apache-inspired canopies, surveillance equipment, weapons props, and other exterior fittings. The alterations made the full-size helicopters so heavy that they could not safely perform every maneuver demanded by the script. For the climactic fight between Frank Murphy and Cochrane, the spectacular 360-degree loop that allows Murphy to reverse position and destroy his pursuer was performed by a radio-controlled helicopter model built and flown by modeller John Simone Jr., not by the piloted aircraft carrying the actors. A separate static cockpit model was also constructed for close-up work. The illusion was successful enough that the scene became one of the film's signature moments, but the production's reliance on multiple aircraft, models, and dangerous-looking low-level flying illustrates how much mechanical sleight of hand was required to sell the supposedly superhuman Blue Thunder.
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