Aircraft motion involving constant angle of attack but varying pitch
A diagrammatic representation of a fixed-wing airplane in phugoid
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).
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,...
oscillation called a phugoid mode and a short-period oscillation referred to as the short-period mode. The longer period mode, called the "phugoid mode" is the...
inertia increase the coupling between short period and phugoid modes, so that these will modify the phugoid. With a symmetrical rocket or missile, the directional...
yaw-roll coupling is one of the basic flight dynamic modes (others include phugoid, short period, and spiral divergence). This motion is normally well damped...
system in an attempt to dampen the phugoid cycles and Dutch rolls further. This was somewhat successful, as the phugoid cycles were dampened almost completely...
aircraft will be less responsive and less manoeuvrable.: 588 Decreasing phugoid (long-period) oscillations can be achieved by building a smaller stabilizer...
airplane was tending to pull right, and oscillated slowly vertically in a phugoid cycle – characteristic of planes in which control surface command is lost...
disabled. The aircraft pitched rapidly up and down in a roller-coaster phugoid, oscillating between a nose-up and a nose-down position. As in the case...
hydraulic systems and set the wing on fire. The aircraft began a dangerous phugoid (vertical oscillation) but the crew managed to land safely at the airport...
pitch (phugoid) oscillation, spiral and Dutch roll. An aircraft with too large a horizontal tail on a fuselage that is too short may have a phugoid instability...
System Flight 653, a 737-200 registered as 9M-MBD, crashed following a phugoid oscillation that saw the aircraft diving into a swamp after both its pilots...
{v}}^{2}\right){\tilde {v}}^{2}\cos ^{2}\theta }}}\right)} Equations of motion Phugoid g is the acceleration due to gravity. ( 9.81 m / s 2 {\displaystyle 9.81\...
stalls, dips and accelerates, once again producing lift, a process termed phugoid oscillation.[clarification needed] In the past it was often found on the...
to fly an aircraft without functioning control surfaces is to avoid the phugoid instability mode (a cycle in which the aircraft repeatedly climbs and then...
Performance and weather minima – Performance envelope – Personal air vehicle – Phugoid – Pilot controlled lighting – Pilot licenses – Pilot licensing and certification...
methods of gliding and determined that Microraptor most likely employed a phugoid style of gliding: launching itself from a perch, the animal would have...
functioned like a split-level "biplane", and that it likely employed a phugoid style of gliding, in which it would launch from a perch and swoop downward...
July 12, 1983. It was later scrapped at Davis–Monthan Air Force Base. Phugoid China Eastern Airlines Flight 583 United Airlines Flight 826 "Five Injured...
disturbance were shown to consist of a long-period oscillation called the phugoid oscillation, usually with a period in seconds about one-quarter of the...
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