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  2. Vortex ring gun - Wikipedia

    en.wikipedia.org/wiki/Vortex_ring_gun

    Knock-down test of a 109 mph (175 km/h; 49 m/s) vortex ring gun. The vortex ring gun is an experimental non-lethal weapon for crowd control that uses high-energy vortex rings of gas to knock down people or spray them with marking ink or other chemicals. The concept was explored by the US Army starting in 1998, and by some commercial firms.

  3. Air vortex cannon - Wikipedia

    en.wikipedia.org/wiki/Air_vortex_cannon

    An air vortex cannon is a toy that releases doughnut-shaped air vortices — similar to smoke rings but larger, stronger and invisible. The vortices can ruffle hair, disturb papers or blow out candles after travelling several metres. An air vortex cannon can be made easily at home, [1] [2] from just a cardboard box. [3]

  4. Vortex generator - Wikipedia

    en.wikipedia.org/wiki/Vortex_generator

    A vortex generator (VG) is an aerodynamic device, consisting of a small vane usually attached to a lifting surface (or airfoil, such as an aircraft wing) [1] or a rotor blade of a wind turbine. [2] VGs may also be attached to some part of an aerodynamic vehicle such as an aircraft fuselage or a car.

  5. Vortex engine - Wikipedia

    en.wikipedia.org/wiki/Vortex_engine

    The air's momentum causes centrifugal forces on the air in the vortex, which reduce pressure in the vortex, narrowing it further. Narrowing further increases the vortex speed as conservation of momentum causes it to spin faster. The speed of spin is set by the speed of the air leaving louvers (33, 34) and the width of the arena (2).

  6. Polar vortex? Artic air mass? Whatever it's called, here's ...

    www.aol.com/polar-vortex-artic-air-mass...

    The polar vortex is a large area of low-pressure and cold air surrounding both of the Earth’s poles, according to the weather service. It always exists near the poles.

  7. Starting vortex - Wikipedia

    en.wikipedia.org/wiki/Starting_vortex

    A starting vortex behind a wing profile, made visible by plotting pressure distribution in a CFD simulation. In fluid dynamics , the starting vortex is a vortex which forms in the air adjacent to the trailing edge of an airfoil as it is accelerated from rest. [ 1 ]

  8. Latest radar evidence suggests Black Hawk in DC disaster was ...

    www.aol.com/latest-radar-evidence-suggests-black...

    Newly released data from ground-based radar came out Tuesday suggesting an Army helicopter was higher than it was supposed to be when it collided with American Airlines Flight 5342 a week ago ...

  9. Best air fryer 2022: 11 buys that cost less than a penny per ...

    www.aol.com/news/best-air-fryer-2022-11...

    3. Ninja Foodi Dual Zone Air Fryer. The best air fryer for families. Capacity: 7.6L | Wattage: 2,400W | Price to run (per hour): 82p | Interface: Digital | Dimensions (cm): H39.7 x W37 x D31.5 6 ...

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