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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.
En-us-phugoid.oga (Ogg Vorbis sound file, length 1.0 s, 268 kbps, file size: 33 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
[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.
James Joyce (2 February 1882 – 13 January 1941) was an Irish novelist, poet and literary critic.He contributed to the modernist avant-garde movement and is regarded as one of the most influential and important writers of the 20th century.
An animated illustration of the two motions which combine into a Dutch roll Dutch roll damping technique, scanned from U.S. Air Force flight manual. Dutch roll is an aircraft motion consisting of an out-of-phase combination of "tail-wagging" (yaw) and rocking from side to side (roll).
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