If the tail rotor system is compromised, the helicopter is "just a rock spinning under a rotor blade," Goldman said.

Helicopter rotor blades are no longer made out of wood, rather they're made out of composite materials to maximize their strength to weight ratio.

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.

Investigators in Whitemarsh Township are just beginning to determine what caused a medical helicopter to make an emergency landing Monday night.

The aircraft was on a sightseeing flight when it suddenly broke apart in midair, its rotor blades falling separately toward the water.

The rotor of the helicopter from last week's deadly crash has been retrieved from the Hudson River, four days after the devastating accident that killed all six people on board, according to a ...

Video showed the helicopter plunging into the 5-foot-deep water near Jersey City, New Jersey, without its tail rotor or main rotor blade. The NTSB is investigating the cause of the crash.

Video showed the helicopter plunging into the 5-foot-deep water near Jersey City, New Jersey, without its tail rotor or main rotor blade. The NTSB is investigating the cause of the crash.