Most likely a repost but pretty cool indeed. http://video.google.com/videoplay?docid=-1309610693318372088 It shows the power of the backwash from a 747.
Cool video, thanks for sharing. 20 seconds+ of full power and they risk tearing up the runway!!! I was wondering the same thing? Why doesn't the plane just get pushed with the tires locked up skidding?
Pretty impressive. The 747 stays in place because of all the massive brakes on all those massive wheels (16 braked wheels out of 18 total,nose gear wheels have no brakes),which most likely are chocked as well. And they are only running 2 engines. I fly 737's, and on a wet runway it will start to slide with brakes set to park and take-off thrust on both engines.On a dry tarmac it will hold it's place....barely.
The pilot only had the inboard engines spooled up to takeoff thrust. But still, I haven't seen a bumper come off a car like that Mondeo's did since, well, last week when I saw it happen to a fart-can import whose owner must have run out of double sided tape. Rather than a Citroen, couldn't they have used an old VW bus loaded with crash test dummies dressed in hippie garb?
with school, we went to GE's engine test facility. GE uses a 747 as a test bed aircraft for the GE alliance engine that will be used on selected A380's, the GP7200. as you take off, or test in their case to make sure the engine works properly before taking off, you need to spool the engines to full power. well the GE alliance engine makes about as much thrust as the 3 remaining Pratts on the GE plane. At the request of the runway, huge concrete waste blocks were piled up at the end of the runway as not to throw huge dust storms upon take off. in theory the blocks would thake the grunt of the wind and keep the dirt relatively undisturbed. not the case. the GE alliance engine was reportedly blowing 10 ton blocks away like they were leaves (oops) The engines in this video were 58 kips thrust(IIRC), but the GE alliance is supposed to produce 76,500 - 81,500 pounds of thrust, with tests exceeding 94,000 lb thrust. so imagine what that would do to the citroen also as a note, GE supposedly got in trouble for testing because where an asphalt taxiway turns to the concrete runway, there is a small gap. the thrust was so great that air was getting into this crack an lifting the asphalt up (double oops)
hahaha. they're arent done testing compliance yet, but they are $15m USD here's a picture of GE's testbed (note the unusually larger engine at the right of the picture) http://www.victorvillerotary.org/gallery/speakers/ftb.jpg i dont have pictures from the tour, as they would not want a technology leak. therefore there were no pictures allowed. but the plane sits in its very own hanger (large enough for a 747 to EASILY fit) it is very amazing to climb to the second floor lobby and look through the window straight into the nose of a 747. the GP7200 engine wasn't designed to fit a 747, so it barely clears the runway. when dry, there is maybe 1.5 feet of ground clearance between the nacelle and the ground, and at GWES (gross weight at engine start) it aparently clears by 6 inches or so......talk about low ground clearance edit: another picture, flying dirty http://www.mtu.de/de/Presse/presse_archiv/Pressebilder_Download/first_flight2_jpg_0001.jpg
Amazingly, the fans for the A380 (GP 7000) aren't GE's/Pratt's the most powerful out there (they're a joint venture between the two engine builders). They put out a "measly" 76,500 - 81,500 lbs thrust The GE90 has been rated at 120,000 lbs of thrust per engine, while the PW 4098 is just shy of 100,000 lbs thrust. Both are used for Boeing's 777.
the A380 uses 4 GP7200's where as boeing seems to like ETOPS certifications by only putting 2 GE90's on. thats why the GE90's have to put out that much more thrust. but 120,000lb thrust is simply amazing, especially considering their TSFC
