Rotor wash

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Rotor wash is something mentioned by many entities in Hammer. Rotor wash is the effect of downward wind generated by a helicopter as the propellers spin.

Source Source

In Source Source, this effect is represented in multiples ways:

  • Ropes being pushed up.
  • Dust clouds.
  • Physics objects being pushed away.
  • Special ring-shaped water overlays.

Examples

Half-Life 2 Half-Life 2

All of the large flying NPCs (such as the Combine helicopters) in Half-Life 2 Half-Life 2 are capable of generating rotor wash.

Rotorwash effect from a Half-Life 2 helicopter pushing away cans.