Alternative formsEdit


Neologism created in 1908 by the British aerodynamics expert Frederick W. Lanchester, from Ancient Greek φυγή (phugḗ, flight) and εἶδος (eîdos, fashion, sort, kind). In the glossary to his book Aerodonetics, Lanchester explains his coinage thus:

"PHUGOID THEORY – (Author), from the Greek φυγή and εἶδος, lit. flight-like: The theory dealing with longitudinal stability and the form of the flight path. Hence also Phugoid chart, Phugoid curve, Phugoid oscillation, etc. (Ch. II.) The appropriateness of the derivation is perhaps diminished by the fact that the word φυγή means flight in the sense of escape rather than the act of flying in the present signification."[1]


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English Wikipedia has an article on:

phugoid (plural phugoids)

  1. An aircraft motion where the vehicle pitches up and climbs, decreasing speed, and then pitches down and descends, increasing speed.
    • 2016 November 2, Taylor, Rob, “Malaysia Airlines Flight 370 Likely in Steep Dive Before Crash”, in The Wall Street Journal[1]:
      As well as physical debris, the report drew on recent analysis by Australian defense scientists of burst frequency signals from Flight 370 to satellites that indicated the aircraft had been descending fast, likely in an automated series of swooping dives called fugoids.


  1. ^ Lanchester, Frederick W.. Aerial Flight, Vol. 2: Aerodonetics: Constituting the Second Volume of a Complete Work on Aerial Flight. London: Archibald Constable & Co., 1908, p. 348.