Multiple choice general knowledge

What Igor Sikorsky invented?

  1. Hydroplane

  2. Jet engine airplane

  3. Helicopter

  4. Glider
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Igor Sikorsky was a Russian-American aviation pioneer who invented the first successful single-rotor helicopter in the 1940s. His design established the basic configuration for most modern helicopters - a main rotor for lift and a tail rotor to counteract torque.

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