Helicopters have little to no visual or physical effects on the player. You can walk straight into a moving tail / main rotor without any effects on the player or the rotor. Walking up to a running helicopter without goggles or glasses has no effect on the player. The only real effect that is already in the game is the shaking screen when a helicopter flies over. Walking into a moving rotor should both both chop you into kibbles and screw up the rotor. Facing downwash without eye protection should injure your eyes (As this cannot be properly simulated, just slightly injure the player and add a "Dirt in your eyes" or "Water in your eyes" effect for 2-5 minutes. {F23234}