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Enables the chopper to hover virtually undetected. Why It’s a Cult Classic Blue Thunder (1983) - IMDb

The fictional "special" helicopter was actually a modified . Its in-movie features include:

The film follows (Roy Scheider), a talented but traumatized LAPD helicopter pilot tasked with testing a state-of-the-art military-grade chopper nicknamed " Blue Thunder ". Murphy soon discovers the craft isn't just for police work; it’s part of a sinister government plan called "Project Thor" designed for mass surveillance and domestic crowd control. Key Features of the "Blue Thunder" Helicopter