3 ms·

How fast does air have to go to hurt your face?

• dredmorbius 3y ago
  Again, it depends on what's in it. At even modest cycling speeds, dust, sand, insects, rocks, small children, etc., may irritate or injure eyes. Eyewear is strongly recommended. At highway speeds (~100 kph) your eyes will tend to tear up. With goggles, motorcyclists, race-car drivers, and pilots sustain wind speeds of ~200--300 kph, though that is probably an upper reasonable limit, and again, any sort of debris will greatly increase trauma. (Some) pilots have survived supersonic bailouts or loss of structural integrity: <http://www.classichistory.net/archives/sr-71-breakup http://www.classichistory.net/archives/sr-71-breakup>. Though typically, that ride starts with a full flight suit and helmet, though it needn't end in the same state.