If helicopters didn't have tail rotors, they would spin in circles because they need a force pushing in the opposite ...

Have you ever noticed that military and recreational drones have four propellers, but helicopters have three? Here's ...

Lockheed Martin company Sikorsky has piloted its rotor blown wing uncrewed aerial system (UAS) in both helicopter and ...

Related: Mars helicopter flies back-to-back to prep for 'solar conjunction' (video) Over the course of three weeks, the dual rotors were spun at exponentially greater speeds to test their durability.