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

Many helicopters use tail rotors to counteract this force, while others feature multiple counter-rotating rotors which cancel out the torque forces, such as the 60-year-old CH-47 Chinook.

RC helicopters have quite a few differences than passenger and military helicopters, which is why they can fly upside down. Here's what you need to know.

The R550X works by using a combination of hardware and software components. The hardware includes the helicopter frame, engine, rotor system, fuel system, landing gear, cargo bay and mission payload.

But helicopter-maker Bell has been flying a new experimental craft with a totally different tail rotor, a system that could be safer in some cases, and is also quieter than a traditional tail rotor.

Being flexible is bad. The Defiant isn’t the first coaxial helicopter: the Russian Kamov Ka-80 sports two rotors above each other, and Chinook helicopters also use two large rotors that spin in ...

The sightseeing helicopter that crashed in Pigeon Forge last week, killing all five people aboard, sounded as if "the engine was wound tight" and that it "lost the rotor sound," a witness told ...

The rotor blades of a helicopter landing on rugged, remote terrain struck a California Highway Patrol officer and severely injured him as he helped rescue an injured hiker, officials said Monday.

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.

Feb. 15 -- A survivor of the crash of two Army Black Hawk helicopters that left six dead earlier this week said cargo hanging from one of the choppers might have hit the rotor blades of the other ...

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, ...