NASA's Ames Research Center and NASA's Langley Research Center, in partnership with The Boeing Co., have completed wind tunnel testing of a full-scale Boeing 757 vertical tail model equipped with active flow control technology.
I would imagine they didn't want to show air bus their secret sauce. Do you remember the tail that ripped off over New York on the A300? Those kinds of things aren't supposed to happen because of good computer simulation. Well, the computers aren't 100% accurate yet. This is especially true with turbulence simulation such as when the rudder is full swing. We still have to build things and put them in the wind tunnel to actually trust the simulation data.
NathansHVAC Or maybe it wasn't a computer related issue, it might've been related to faulty assembly, poor maintenance, or something completely different. (On reading the Wikipedia article, the tail fell off due to excessive use of the rudder.)
atomicsteameng The pilot in command over-stressed the rudder, according to investigations. Planes have to be built light in order to fly, and that means fragile for most. It's not that hard to pull the wings off most civilian airplanes (and some military ones) by over-controlling them. They have to be flown within their particular limitations to be safe.
Doggeslife wow! Just goes to show how much "grip" these planes have with the air. Of course in normal flight the plane is shifting tons of air every second so... Wow.
Was this edited? I am in Cleveland, and our 8x6 wind tunnel at Nasa Glen Research Center is so loud it could be herd all the way in Berea and parts of North Olmstead. No noise of the large motors of the wind tunnel in this video. It'd be cool to hear. I think the 8x6 here has 6 30,000HP motors that were installed in 1943.
The 8x6 is supersonic. The 40x80 is much slower. The 9x7 supersonic wind tunnel across the street from the 40x80 is very loud and can be heard from about a mile away.
The 8x6 is a single-motor tunnel with one fan. The full scale tunnel at Ames has the 6 huge motors and can reach 350 mph in the smaller 40x80-foot test section seen in the video. But since a man is standing next to the model holding a smoke wand, I doubt they are running it any faster than 50-80 mph, so little noise generated : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-AsdaKYzUPls.html
Yuva Y , not really. The beginning shots of the tail being lifted was taken within the tunnel facility, positioned just below the elevated 40x80 foot test section (you can see the test section right behind the hanging flag in the opening scenes before the camera pans down), and the footage shows it being loaded and mounted in said test area, followed by footage of the test in progress. I didn't notice any transportation scenes delivering the tail to NASA/Ames.
unless you pay $250K in taxes, then your insignificant tax contributions wasn't enough to turn on the turbines or the lights in that facility. Even with $250K tax, you can run the test for half a day.
+philip s (Dishano) Hi Philip, great question. Often times, Computational Fluid Dynamics (CFD) simulations can be helpful for getting rough estimates, visualizing flow behavior, etc., but often times the accuracy simply isn't there, the software can't take into account a special feature of the geometry or the flow, an so on. As mentioned in the description, this tail has active flow control technology implemented, which is very difficult to simulate accurately (I recommend you look up some examples of different active flow control technologies, and you will see why). Also, it's important to remember that simulations do not stand on their own; experiments should validate theoretical work, and the experimental data will then in turn help refine the simulation!
+Daniel Carroll Almost anything you use in your daily life that has been engineered, e.g. your car, computer, bike, buildings you work in, etc... have been analyzed in a computer simulation in different ways BEFORE they were built. Empirical data trumps all, but before that point (or of it isn't possible to obtain real-life data due to some extreme conditions, cost, availability, time, etc.) computer simulations are a critical tool for engineering and various theoretical and applied sciences. Also, before deciding to build something it's important to have data to back up why/how you build it before spending the resources on its physical construction. So, in short: yes, I am seriois.
math isn't there yet. The day we get math that simulated reality we will see the future literally. A perfect formula will give you an absolute result. So for example if I had the exact mathematical formula for everything I would have no deviations in a simulation.
They managed to build a giant wind tunnel but didn't consider putting a robot arm instead of a human for holding the smoke nozzle. I can see 4 persons inside the tunnel, they create a huge blockage effect inside the tunnel. This visualisation is inaccurate unless they just wanted to demonstrate the smoking system, not for visualisation purposes
Tail section FAA Boeing yep wright brothers head guy wire meant to state in previous comment on wright brothers huh previous. History????? Ya think???? Unbelievable
