Phugoid
Aircraft motion involving constant angle of attack but varying pitch / From Wikipedia, the free encyclopedia
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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". This is one of the basic flight dynamics modes of an aircraft (others include short period, roll subsidence, dutch roll, and spiral divergence).