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A diagrammatic representation of a fixed-wing airplane in phugoid. In aviation, a phugoid or fugoid (/ ˈ f juː ɡ ɔɪ d / ⓘ) 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".
The phugoid oscillation is a slow interchange of kinetic energy (velocity) and potential energy (height) about some equilibrium energy level as the aircraft attempts to re-establish the equilibrium level-flight condition from which it had been disturbed.
Since the lift is very much greater than the drag, the phugoid is at best lightly damped. A propeller with fixed speed would help. Heavy damping of the pitch rotation or a large rotational inertia increase the coupling between short period and phugoid modes, so that these will modify the phugoid.
[3]: 319 This greatly excited the phugoid motion, [3]: 291 and the aircraft pitched up, before pitching back down after power was reduced. When power was added again, the aircraft rapidly pitched up to 40°, and the airspeed dropped down to 108 knots (200 km/h; 124 mph) at 6:49:30 p.m., [ 3 ] : 1–6, 291 briefly stalling at 9,000 feet (2,700 m).
Phugoid mode and "porpoising" mode are different ones. The first is a long period one, and the second is a short period movement as the change in AoA is. The airplane has three modes of oscillation. (CFG) I added the "too technical" comment primarily because I had no idea what a "singlet" is.
The Latin Wikipedia (Latin: Vicipaedia or Vicipaedia Latina) is the Latin language edition of Wikipedia, created in May 2002. As of January 2025, it has about 140,000 articles . While all primary content is in Latin, modern languages such as English , Italian , French , German or Spanish are often used in discussions, since many users find this ...
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The Enciclopedia Libre was founded by contributors to the Spanish Wikipedia who decided to start an independent project. Led by Edgar Enyedy, they left Wikipedia on 26 February 2002, and created the new website, provided by the University of Seville for free, with the freely licensed articles of the Spanish Wikipedia. [3]