Helicopters

What enables a helicopter to take off and land vertically?

• Jet engines

• Propellers or rotors

• Wings

• Wheels

Who designed the first helicopter capable of crewed free flight?

• Leonardo da Vinci

• Paul Cornu

• The Wright Brothers

• Igor Sikorsky

What is the principle of helicopter flight?

• Gliding

• Rotating airfoil

• Jet propulsion

• Fixed wings

How is a helicopter different from an airplane?

• It can only move in one direction

• It uses wings for lifting power

• It cannot remain stationary in the air

• It has at least one horizontal propeller or rotor

What was a significant step in the history of vertical flight in 1907?

• The invention of the jet engine

• The first helicopter-like motorized aircraft flew

• The invention of the parachute

• The first airplane flight

What does an autogiro use to obtain lift?

• Fixed wings

• Powered rotors

• A jet engine

• Mechanical rotation of the rotor

Who made the first successful flight of an autogiro?

• George de Bothezat

• Igor Sikorsky

• Paul Cornu

• Juan de la Cierva

What was the Focke Achgelis Fa 61 known for?

• Being the first jet-powered helicopter

• Inventing the helicopter rotor

• Setting numerous helicopter records

• Being the first mass-produced helicopter

What feature characterizes most modern helicopters?

• Tandem rotors

• A single jet engine

• Fixed wings

• A single main rotor and a tail rotor

What was a major limitation in the development of helicopters?

• Material strength

• Engine power

• Design complexity

• Lack of interest