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Metal Birds, Part 2

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Metal Birds, Part 2
Print Metal Birds, Part 2 Reading Comprehension with Fifth Grade Work

Print Metal Birds, Part 2 Reading Comprehension with Sixth Grade Work

Print Metal Birds, Part 2 Reading Comprehension

Reading Level
     edHelper's suggested reading level:   grades 5 to 7
     Flesch-Kincaid grade level:   10.24

Vocabulary
     challenging words:    air-sea, airfoil, power-driven, resupply, rotor, adjustment, aircraft, tourism, propellers, helicopter, military, propeller, opposite, extremely, engineer, especially
     content words:    Metal Birds, Leonardo DaVinci, Igor Sikorsky, Russian-born American, Louis Breguet, Persian Gulf, Iraq Wars, Korean War

Other Languages
     Spanish: Aves de metal (segunda parte)


Metal Birds, Part 2
By Trista L. Pollard
  

1     In Metal Birds, Part 1 you learned about the parts of airplanes. In this article we will explore the world of helicopters. Helicopters are aircraft that use one or more power-driven horizontal propellers to obtain lift. These propellers are called rotors. Helicopters can do what airplanes cannot: they can take off or land vertically and fly forward, backward, and sideways. Some historians say that Leonardo DaVinci described a machine similar to a helicopter in the sixteenth century. However, the first practical helicopter came onto the scene in 1942. It was built by Igor Sikorsky, a Russian-born American engineer. Other developers of the helicopter were Louis Breguet of France and Juan de la Cierva of Spain.
 
2     The blades of a helicopter's rotor are long and shaped like an airfoil. A helicopter's blades or propellers spin in a circle, which allows them to move through the air even when the helicopter is standing still. Since the air is flowing faster over the top of the propeller than the bottom of the propeller, lift is produced for the helicopter. If the helicopter had only this one set of propellers spinning in one direction, the helicopter would rotate out of control in the opposite direction. This is why the tail rotor is extremely important. The propellers of the tail rotor are smaller than the propellers of the main rotor. The tail rotor turns in the opposite direction of the .....
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