Helicopters

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Question Answer
To flail
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to move energetically in an uncontrolled way
Curve
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a line that bends continuously and has no straight parts
Flat
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level and smooth, with no curved, high, or hollow parts
To harness
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to control something, usually in order to use its power
Dense
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having parts that are close together so that it is difficult to go or see through
Lift
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the force on the wing of a bird or aircraft that keeps it in the air as it moves forward
Blade
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the flat part on a knife or similar tool or weapon, with a very thin edge used for cutting / a wide, flat part on a tool or machine, used to push backwater or air
To hover
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to stay in one place in the air, usually by moving the wings quickly:
Upside down
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having the part that is usually at the top turned to be at the bottom
To spin
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to (cause to) turn around and around, especially fast
Sizeable
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large
Congested
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too blocked or crowded and causing difficulties
Vital
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necessary for the successor continued existence of something; extremely important

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