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  2. Vortex ring state - Wikipedia

    en.wikipedia.org/wiki/Vortex_ring_state

    The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. Often the term settling with power is used as a synonym, e.g., in Australia, the UK, and the US, [2] [3] [4] but not in Canada, which uses the latter term for a different ...

  3. Vortex ring - Wikipedia

    en.wikipedia.org/wiki/Vortex_ring

    A vortex ring, also called a toroidal vortex, is a torus-shaped vortex in a fluid; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal , more precisely poloidal .

  4. Loss of tail-rotor effectiveness - Wikipedia

    en.wikipedia.org/wiki/Loss_of_tail-rotor...

    Main rotor disk vortex interference Weathercock stability Tail rotor vortex ring state. Loss of tail-rotor effectiveness (LTE) [1] occurs when the tail rotor of a helicopter is exposed to wind forces that prevent it from carrying out its function—that of cancelling the torque of the engine and transmission. Any low-airspeed high-power ...

  5. 2000 Marana V-22 crash - Wikipedia

    en.wikipedia.org/wiki/2000_Marana_V-22_crash

    As the V-22 descended to land it was dropping at 2,000 feet a minute, well above the prescribed 800 feet a minute. The speed caused the aircraft to enter an aerodynamic condition known as vortex ring state. In this condition, a vortex envelops the rotor, causing an aircraft to lose lift, in essence descending in its own downwash. [6] [7]

  6. Accidents and incidents involving the V-22 Osprey - Wikipedia

    en.wikipedia.org/wiki/Accidents_and_incidents...

    [24] [27] The USAF investigation ruled out brownout conditions, enemy fire, and vortex ring state as causes. The investigation found several factors that significantly contributed to the crash: these include low visibility, a poorly-executed approach, loss of situational awareness, and a high descent rate.

  7. Toroidal ring model - Wikipedia

    en.wikipedia.org/wiki/Toroidal_ring_model

    The toroidal ring model, known originally as the Parson magneton or magnetic electron, is a physical model of subatomic particles. It is also known as the plasmoid ring, vortex ring, or helicon ring. This physical model treated electrons and protons as elementary particles, and was first proposed by Alfred Lauck Parson in 1915.

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  9. Vortex theory of the atom - Wikipedia

    en.wikipedia.org/wiki/Vortex_theory_of_the_atom

    The vortex theory of the atom was based on the observation that a stable vortex can be created in a fluid by making it into a ring with no ends. Such vortices could be sustained in the luminiferous aether, a hypothetical fluid thought at the time to pervade all of space. In the vortex theory of the atom, a chemical atom is modelled by such a ...