Early helicopter engineers faced a major challenge: how to lift heavy loads safely. One unusual solution was the tandem rotor design, which used two large rotors instead of one. This eliminated the ...

The 10 best Helicopters & Rotorcraft of the Second World War ...

A helicopter spun out of control and crashed in Huntington Beach last month after a small control part in its tail came loose, according to a preliminary report released this week by the National ...