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

[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.

[danielngqihuai]

There is a high possibility of the plane stalling (or near stalling) at that nose attitude before it hit the building, so in that case, the wake turbulence is not strong enough to show up clearly in the smoke. Plus the B767's wing has a very high aspect ratio, so there is very little hope to have a strong-enough vortex showing up.

PS see 1: 56, there IS some curling up of the smoke relative to the 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.

[danielngqihuai]

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

[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 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 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.

[CohibaSkeeza]

@CohibaSkeeza I meant decreases with increasing velocity.

[CohibaSkeeza]

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

[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?

[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.

[clnmyjts]

Very good point made here in your video.

[douggard]

after the caption about breasts, there is a voice that says something, hardly audible, over the music

[75niteowl]

9/11 "Truth" rhetorical garbage! This could be a useful teaching tool. Too bad. Vortices are not seen in the 9/11 footage because they are invisible. The video explains that. But the vortices also only occur while the wing is generating lift, which is why there are none in the clouds of smoke that happen AFTER the plane hits the building. No lift, no vortex. Planes that crash into buildings don't make vortices. Your "truth" does not hold water.

[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.

[acdelta57]

wake turbulence is from slow and "dirty" flight. since the aircraft were moving rapidly and clean (no flaps wheels etc..) wake turbulence is reduced immensly and the smoke of the explosion is in the position of the aircraft right before it exploaded therefore since the wingtips exploaded the smoke from their destruction would no show the effects of wake turbulence. its NOT similar to a plane dropping a bomb than flying past that point allowing the vortices to float down and out to the smoke

[ITSBRTIME]

creepy....

[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 , =)

[ukv1290]

Urgh

[mikeboxnic99]

never seen test videos of wake turbulence yet nice!

[TheJanehair122]

wow ! awsome