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😲 When a helicopter hovers or lands, its spinning rotors force huge volumes of air straight downward (called downwash), creating wind speeds that commonly reach 60 to 100 mph (95 to 160 km/h) near the ground and even higher directly under the blades; while the actual air pressure increase is modest, the sheer airflow is powerful enough to kick up debris, flatten grass, knock over loose objects, and make standing difficult, which is why helicopters can create dust clouds, spray water outward, and require clear landing zones despite not feeling like a “crushing” pressure wave. (Via ViralHog) #surprise