Construct · 1 fields · 1 citations

phugoid: a standalone construct

One name. One construct. A landmark on the map.

● anchor · a standalone flight-dynamics construct Nearest construct by meaning·not indexed
phugoid1 CONSTRUCTPhugoid modeLANCHESTER · MODE

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Flight dynamics

A slow trade of speed for height

In flight dynamics, the phugoid is the slow, lightly damped longitudinal oscillation of an aircraft in which it trades airspeed for altitude and back (climbing and slowing, then diving and speeding up) at a nearly constant angle of attack, with a period of many seconds. Etkin and Reid's Dynamics of flight: Stability and control derives it as one of the two longitudinal modes (the other being the fast, heavily damped short-period mode), governed mainly by the exchange between kinetic and potential energy. The term was coined by F. W. Lanchester in his early aerodonetics; the referent is a specific low-frequency stability mode, characterised by its period and damping, and it exists only in the flight-dynamics setting.[1]

Unit
The period and damping of the long-period speed–altitude oscillation
Recovery means
Not applicable
Measured by
Extracted from the longitudinal equations of motion and flight tests as the long-period mode's frequency and damping ratio

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Nearby constructs

angle of attack1 fields · 1 citationsanchor · a standalone aerodynamic constructattack4 fields · 10 citationsjingle · one word, four constructsbeing3 fields · 3 citationsjingle · one word, three constructs

References

  1. Etkin, B., & Reid, L. D. (1996). Dynamics of flight: Stability and control (3rd ed.). John Wiley & Sons. ISBN 9780471034186

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