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Why are helicopters called rotary-wing aircraft?

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  1. Their engines rotate instead of using pistons
  2. Each spinning blade acts like a wing
  3. Their fixed wings pivot only during turns

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References

  1. NASA: What Is a Helicopter? www.nasa.gov/learning-resources/for-kids-and-students/what-is-a-helicopter-2-grades-5-8 Checked 2026-10-10.

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