Editing Phugoid (section)

{{short description|Aircraft motion involving constant angle of attack but varying pitch}}

[[File:Phugoid8.png|400px|thumb|right|A [[diagram]]matic representation of a [[Fixed-wing aircraft|fixed-wing airplane]] in phugoid]]

In [[aviation]], a '''phugoid''' or '''fugoid''' ({{IPAc-en|ˈ|f|juː|ɡ|ɔɪ|d|audio=En-us-phugoid.oga}}) is an aircraft motion in which the vehicle [[Aircraft principal axes|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 [[aircraft dynamic modes|flight dynamics modes]] of an [[fixed-wing aircraft|aircraft]] (others include [[short period]], [[Aircraft_dynamic_modes#Roll_subsidence_mode|roll subsidence]], [[dutch roll]], and [[spiral divergence]]).