1. what is the goal of the text? 2. what is the definition of helicopter according to the text? 3. how does a helicopter produce thrust? 4. what are the advantages of helicopter for civilian? 5. what are the advantages of helicopter as military aircraft
The helicopter is a heavier air-to-air aircraft, winged wing whose rotor is driven by the engine
Products by the tail rotor
Include emergency medical services etc
Participated in a conbat