Can a helicopter fly upside down?
Yes. But as far as we are aware none can sustain inverted flight. There are many remote-control helicopters that fly upside down for prolonged periods so it is aerodynamically possible. It requires a lot of power and a lightly loaded helicopter to even loop a helicopter. Aerobatic flight is prohibited in most normal helicopters most pilots are more comfortable with the fuselage firmly suspended from the rotor system.
