Helicopters can be as dangerous as they are valuable, in part because of a phenomenon called rotor wash. What is rotor wash, ...

Despite being completely different types of aircrafts, it's common to wonder if helicopters are powered by jet engines ...

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

The man and three other British tourists, including his sister, had reportedly rented the helicopter from the island of Mykonos to the capital Athens.

The main rotor of the doomed helicopter that crashed into the Hudson River was finally recovered Monday -- as investigators continue to probe what caused the deadly tragedy.

Why a Helicopter Broke Apart Over the Hudson River Video shows the spinning rotors separating in midair from the fuselage.

But what I can tell you is the tail rotor is what keeps the helicopter from spinning out of control. That's your anchor, so to speak, that keeps the helicopter from being a top," he said.

With most helicopters, when they try to go fast, the top rotor blades spin rapidly, encountering significant drag, as well as another aerodynamic issue called retreating blade stall.

The Brief Six people died when a helicopter crashed into the Hudson River Thursday afternoon. One aviation expert says that the entire rotor assembly may have come off, causing the crash.

Chilling footage captured the aircraft crumbling midair before it plunged into the river, with at least one rotor still spinning as other parts of the helicopter splashed down in various directions.

This method requires the rotor to be powered, otherwise it wouldn't spin fast enough to create enough force to maintain altitude, and is fundamentally why helicopters need tail rotors.

The main rotor of the doomed helicopter that crashed into the Hudson River was finally recovered Monday — which could provide crucial information as investigators continue to probe what caused ...