<https://forum.davidicke.com/index.php?/topic/5513-the-flat-earth-thread-the-reality-of-our-physical-plane-v2/page/7/#comment-122243>
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"Right and if they turn their engines off mid air what happens ? \n \n\n\n\t \n \n\n\n\tIn a vacuum with no wind resistance everything accelerates at the same speed toward the ground \n \n\n\n\t \n \n\n\n\tWith air resistance things get more complicated \n \n\n\n\t \n \n\n\n\tPlumbing employs both vacuum and gravity systems to remove waste water \n \n\n\n\t \n \n\n\n\thttps://www.plumbermag.com/how-to-articles/gravity_vacuum_system_septic/gravity_vs._vacuum\n \n\n\n\t \n \n\n\n\t \n \n"
<https://forum.davidicke.com/index.php?/topic/5513-the-flat-earth-thread-the-reality-of-our-physical-plane-v2/page/7/>