system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do helicopter blades actually lift a 20,000 pound helicopter?
gpt
To generate lift we use wings, which we move fast through the air. We can do this by making the vehicle go fast (planes) or by rotating the wings fast around a midpoint (helicopters).

Wings moving at an angle through the air will push that air down. As a result, the wing is pushed up. A helicopter moves a *lot* of air down (which is one of the reasons it's so noisy), so it can lift quite some weight up.