One of the more interesting rotor systems is an intermeshing or synchropter configuration, which can be seen on the K-MAX helicopter.

A former military helicopter pilot told BI the helicopter's rotary system appears to have failed. Helicopter crashes are more common than airplane accidents, but main rotor detachment is rare.

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.

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 ...

Investigation into deadly chopper tragedy Divers are scouring the Hudson River and investigators are going through maintenance logs to find out why the main rotor separated from the helicopter ...

And what struck me, what scared me, is the main rotor system was gone. There's no main rotor on the helicopter and the tail boom was also gone, and it's just a vessel at that point with no direction." ...

In a main and tail rotor setup, the tail rotor spins to produce side force, which enables the craft to yaw. Today, we are discussing how helicopters can change direction in the air without ...

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.

Take a look at the H160's tilted tail rotor, biplane-style horizontal stabilizer, and advanced glass cockpit.

The images, reportedly captured in April, show a compound helicopter with coaxial main rotors and pusher propeller, which bears similarity to Sikorsky’s ...

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. Divers were spotted ...