Phugoid
(wikipedia.org)
In aviation, a phugoid or fugoid (/ˈfjuːɡɔɪd/ ⓘ) is an aircraft motion in which the vehicle pitches up and climbs, and then pitches down and descends, accompanied by speeding up and slowing down as it goes "downhill" and "uphill".
In aviation, a phugoid or fugoid (/ˈfjuːɡɔɪd/ ⓘ) is an aircraft motion in which the vehicle pitches up and climbs, and then pitches down and descends, accompanied by speeding up and slowing down as it goes "downhill" and "uphill".