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Why do helicopters make that iconic thumping sound when they're flying?

Helicopters have one of the most recognizable sounds in aviation. The signature "whop whop" or deep thumping sound announces its arrival long before it appears in the sky. It's a sound so iconic, it's ...
BGR

NASA's Mars Helicopter Actually Breaks The Sound Barrier

NASA recently pushed the rotor blades of its next-generation Mars helicopter to Mach 1.08 at its famed Jet Propulsion Laboratory (JPL) near Pasadena, California. JPL is testing a high-performance ...
CNN

Close helicopter routes and Army crew’s perception of the wrong aircraft determine why a regional jet and helicopter collided

Nearly one year after the midair collision between an Army helicopter and an American Airlines regional jet near Washington, DC, the National Transportation Safety Board sharply criticized the Federal ...