8 The new Lockheed SR-72. Travels 4598 mph. Has to drop over 3000 feet per second in order to not fly off in to space (youtu.be) posted 3 years ago by FortheGenerations 3 years ago by FortheGenerations +10 / -2 18 comments share 18 comments share save hide report block hide replies
That is "dropping altitude" in reference to AGL (above ground level) or ASL (above sea level).