Wake Turbulence -- An Invisible Enemy ..The Killer casts no shadow =o

Wake turbulence refers to the chaotic movements of air that follow an aircraft as it moves through the atmosphere. There are two main elements: wingtip vortices and jetwash. Wake turbulence can be dangerous if another aircraft becomes caught in it.

Wingtip vortices are narrow tubes of turbulence that spiral back from the tips of each wing of a plane as they generate lift. They create drag on the aircraft and are also the most important and dangerous component of wake turbulence. Wingtip vortices can remain in the air for up to three minutes and are much more stable than jetwash. Jetwash is the turbulence that occurs as a result of the gasses expelled from the engine of a jet aircraft as it flies. It is mush more chaotic than wingtip vortices, but also much shorter-lived.

Wake turbulence presents a particular threat during landing and take off. During these portions of a flight, the plane moves relatively slowly and at a high angle of inclination, maximizing the formation of wingtip vortices. Planes are also closest together during take off and landing, increasing the possibility of one becoming caught in another's wake. Finally, planes are close to the ground at this time, making recovery difficult in the chance that a plane is caught in wake turbulence.
The International Civil Aviation Organization (ICAO), a branch of the United Nations that governs international air traffic classes aircraft based on its Maximum Take Off Mass (MTOM) and has developed rules to minimize the chance of danger from wake turbulence. According to the ICAO guidelines, planes must wait a minimum time between take off or landing after another aircraft depending upon the MTOM of each plane. The greatest potential danger from wake turbulence occurs when a light aircraft lands following a heavy aircraft. In addition to keeping the recommended distance, the pilot of the light aircraft must stay in line with or above the heavy aircraft's path.-http://www.wisegeek.com/what-is-wake-turbulence.htm

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[bengals101]

Wake turbulence, or wing tip vortices are ONLY produced if the aircraft is generating lift. When the planes hit the buildings they were no longer generating lift (because they crashed) and therefor could not be producing wing tip vortices, or wake turbulence. This is by far the easiest conspiracy theory to debunk....nice try tho, do some very basic research on this subject and you will realize how stupid this argument is.

[yourboycal]

@bengals101 Did you miss the planes in the video which did not generate lift? it was a straight fly through?

[EuropaBloke]

cool except for the 911 crap i'm getting sick and tired of it.

join the list and quit annoying ppl please

[yourboycal]

how about you tell that to the families of 9/11 victims who are still waiting for an answer ? perhaps the jersey girls would love to hear you saying your sick of it , well guess what there sick of the lies and desception also , they just want answers like everyone else , but when you see 100 million spent on bill clintons bj compared to less then 5 million for 9/11 investigation it makes you ponder about the people in charge , =)

[CohibaSkeeza]

@CohibaSkeeza I meant decreases with increasing velocity.

[CohibaSkeeza]

@danielngqihuai This is true, induced drag (vortex drag) increases with velocity, but these aircraft are supposedly moving at about 400 mph - still significant vortex shedding. The video goes over the fact that the vortex shedding even at cruise of around 500-600 mph is a major concern for nearby aircraft. There would be no mistaking the wing-tip vortices - I don't see anything remotely close to one at the time marker you pointed to.

[danielngqihuai]

@CohibaSkeeza lol i realize i'm losing...but i read somewhere (maybe wikipedia) that said when a plane goes faster, the vortices get harder to form...because the air have very little time to "go over" the wingtip. When a plane goes slower (eg. landing) the vortices are stronger, and the flaps and slats just provide a larger surface area for it. And as the saying goes 'humans see what they want to see', try see 1:56, at the leftmost part of the flame, i do see some 'curling'. See it for yourself.

[CohibaSkeeza]

@danielngqihuai I know that this is difficult to accept but it has to be true. No vortices = No plane.

[CohibaSkeeza]

@danielngqihuai The vortices are very strong, their energy is equal to the energy required to keep the plane in the air. There is no chance that these vortices would not be seen if this was real aircraft. Just look at the vortices even when planes are landing. They are at low speed, high angle of attack and the vortices are still present and strong. They are so strong, that aircraft have been designed to ride these vortices close to the ground - wing in ground effect.

[danielngqihuai]

@CohibaSkeeza maybe, but as i was saying, the vortex is probably not strong enough to show up clearly in the smoke.

[CohibaSkeeza]

@75niteowl Sorry dude, read my response to bengals101. Remeber helmholtz! Watch this flow visualization video done by Hunter Rouse from iihr /watch?v=4q5ffroIMMc at 13:10 he demonstrates that if an airfoil stops immediately (thus zero lift) the vortex continues well after lift is stopped due to the detachment of the bound vortex.

[CohibaSkeeza]

@danielngqihuai No, even if stalling there is still a vortex and separation present. Lift is still being generated during stall, just that it begins to decrease with increasing alpha at the stall angle of attack. Drag also increases - that means even more vorticity and trubulence.

[CohibaSkeeza]

@bengals101 You are correct but you are incorrect. The vortex will end once the wing has completely entered the building, but the trailing vortex will remain up to the boundary(building wall). Remeber Helmholtz: "A vortex element cannot end in the fluid. It must form a closed path, end at a boundary, or go to infinity."

The vortices should be present and very visible with this seeded flow for many seconds. This is not a real aircraft.

[FRTothus]

Missiles, folks... made-in-the-USA missiles. This was a military training exercise, using written-for-TV scripts/actors/clips as a force multiplier. It's so CIA/Northwoods w/ '70's hi-jackers & a replacement for the "communist" boogie-man. Not the first time our own government tried to blow up our own people in an office building (1993, with the FBI supplying the explosives, eg?), either, & probably not the last, as effective as it is to turn the citizens to support US war for profit, Inc.