4 ms·

True (though stealth bombers are subsonic, just). What about headings that are not straight at you though? May still have value detecting things passing by?

• Ididntdothis 6y ago
  When I was at military I attended a few exercises where jets were involved. They don’t go supersonic but pretty close to it so usually once you start hearing something it’s almost over. It’s actually quite terrifying to have a jet coming at you at 800 km/h at low altitude. Very surprising, then very loud and incredibly fast. You also hear passing by jets only once they are long gone. I assume radar is just much better than sound.
  • jacquesm 6y ago
    Not just jets, a regular propeller based plane can have that effect: https://www.youtube.com/watch?v=4iOoiEbtf2w https://www.youtube.com/watch?v=4iOoiEbtf2w
    • Ididntdothis 6y ago
      Now double or triple the speed, make it much louder and you have a jet.