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Cochrane chases Murphy in a Hughes 500 which has a top speed of 147 mph and easily keeps up with him, demonstrating that Blue Thunder's top speed is less than 150 mph. The F-16s sent after Blue Thunder have a stall speed of 175 mph. They would have to slow down to the point of falling out of the sky to have a shot at Murphy. Its utterly impractical and far more likely that the military would have sent AH-1 Cobra attack helicopters after him. See more...
Trivia
The registration number N77GH is visible on a gold placard on right surveillance camera' but only civilian aircraft are given November numbers. Military helicopters only have a series of numbers like on the tail. You aren't supposed to notice Blue Thunder's real "N" number, but it is there throughout the movie making it known it was truly a civilian helicopter. See more...
Blue Thunder (1983) - 4 with pictures
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