These airliner engines are awesome. Excellent video! I've stood in about the same place and filmed one of our tests of the LM2500, which is basically a CF-6 without a fan and LP turbine. It is so much quieter and less threatening than this video. Possibly of interest: our LM2500 had a data plate stating its rated power was 34,800 Hp. The CF-6's in your video are undoubtedly newer, and likely making even more power!
The 'white smoke' which is actually water vapor is the product of the engines pulling the air into what is a venturi (basically a narrow passage). In the venturi, to maintain equilibrium the air must either travel faster or the pressure must increase. Due to a not perfect system the result is some of both which causes the intake air to rapidly cool for a short time as it enters the intake. The cooling of the air causes the water vapor to condense which creates 'smoke' or more accurately a cloud.
the moister of the warm air being ingested into the engine is condenced into vapor.That is why you see water. Almost like a cloud being formed in the sky,different air temp.
iv seen this done on a maxjet 767, scariest thing iv ever seen... was amazed how the headset man standing at the nose of the plane never got sucked in!
@Jakeyboyshow Exactly. This is the same reason that engines being run when they have a guard on the front (such as say in a test facility) can only be safely run under certain constraints of temperature and humidity. Above a certain humidity, below a certain temperature, this process can cause ice to form on the front of the guard, eventually causing a semi vacuum behind it, and sucking the lot through the engine. Big, expensive bang.
there have been numerous engine ingestions, people getting sucked in. The result is pretty impressive, you can see them on the facebook group "official man gets sucked into a jet engine". I only say this as many comments suggest throwing folk into jet engines, im sure you would only say this if you are cool with the impending blending!
Nice job simtrav. Was in around the same area when they did the same test on an Atlas Air 747-400F a couple of months ago, although wasn't as close for fear of me becoming FOD.
@MikeyNCat- just for info,the fan blades are never running with transonic speed, not even at the fan blade tips.the drag at the fan blades would increase and the forces to the blades would be so huge,that as a result it could happen that the whole fan/engine would be destroyed.
Due to Divergent construction of engine intake duct, the air hits the leading edge of the intake and then 3 things happen: 1: The velocity of the air is greatly slowed down, 2: Air is pressurized, 3: The Air temperature is increased. All this before the air even hits the engine. Just by the shape of the intake....
They do this test BTW to test for vibration in the engine at various loads, as well as to check calibration of vibration sensors. For an engine output test they use the test cell across the road.
@Wahlsen and @MikeyNCat Actually, the tips of the fan blades not only go transonic, they go supersonic at about 80-90% power. At full power, blades tips can go Mach 1.5. So a lot of the blade actually goes supersonic, not just the tips. Also, destructive shockwaves do not form because of the duct surrounding the fan and the number of fan blades. That only happens with propellers and unducted fans. You can tell when the fan blades go supersonic by the loud growling/buzzing sound they make.
I'm just a pilot. We aren't around during maintenance but I believe the mechanics have to run the engine for 5 minutes after certain maintenance to check for leaks before signing the Return To Service.
yeah i saw the documentary about that. ill bet a good chunk of the passengers on board heard the bang. and get this, when they showed the wing of the A380 it had shrapnel damage, and the engine parts fell through a school on batam island and almost hit a kid. the engine pieces missed him by about 4 or 5 inches. and its not just oil leaks thatll cause a blast. compressor failure, over revvin, fuel leaks, or metal debris that got sucked in on take off
most low hung engines have an air nozzle below the intake blasting air forward triggering a vortex .the idea is anything such as ice would spin around fast and be thrown away from the intake during taxi.
Usually you have another mechanic up there taking clearance checks with feeler gauge between fan blade tips and inlet housing....lol Just make sure the rope is strong enough to hold him..lol
Even though the minimum requirements say you dont even need A levels or a degree, most commercial pilots which are flying aircraft now were either in the Air Force or College graduates etc. You also have to do flying aptitude tests etc, and you use to have to get above 120 in an Iq test, the world average is 100 and genius is 140 + . You also have pass a medical examination. Your health, hearing and eyesight have to be good (as long as you have near 20 20 with glasses)
@a090006 They're talking about the tangential speed of the fan blades. They do actually go supersonic even below full power. At full power, the tips of the fan blades move at about Mach 1.5!
@david2371 You cannot convert thrust to horsepower because you need torque and rpm to calculate horsepower. A turbofan engine does not produce any torque other than the torque needed to spin its own fan and compressors. It's only used to move air. However, you could look at the turboshaft version of the CF6-80C2, which is the LM6000. It's basically this engine without the fan and with more turbines to get all the work possible out of the airflow. It's rated at 57,330 shaft horsepower!
That reminds me of the A380 engine failure a little while ago - the failure was caused by an oil leak, but the intense heat of the oil fire apparantly caused one of the main turbine wheels to freewheel and break up - A380 engine failure over Batam Island
simply air moving fast at such a rate that it's starting to condense, that is why you see the water vapor before the engine even has a change to "compress" it. Basically the same thing that happens when air moves quickly over an aircraft wing at high angles of attack :)
It's a Vortex - From Wikipedia - A vortex (plural: vortices) is a spinning, often turbulent, flow of fluid. Any spiral motion with closed streamlines is vortex flow. The motion of the fluid swirling rapidly around a center is called a vortex. The speed and rate of rotation of the fluid are greatest at the center, and decrease progressively with distance from the center. This engine is only demonstrating it's take off procedure. And does no harm whatsoever to the engine
thats true, and i think T/O power stands in the range of 80-90% but that could be higher if the plane might be close to or is at maximum take off weight. and yes you can blow a jet engine on a 767 just as easily as you can in your own street car by over revving the engine. only when a jet engine blows from high RPMs what youll see is alot of smoke, or worse the engine could explode violently
OMG they are shaking quite bad. Now you realize the power that the pylon possess LOL BTW, what did they use to keep the plane in parking position? Cause if i'm not mistaken, the parking brake alone couldn't handle such massive force at take off power setting.
The air pressure at the inlet of the engine is extremely low due to the displacement action of the compressor stages, relative to the surrounding atmosphere. As the water vapour in the air reaches this low pressure zone, it condenses to form visible water droplets. As the vapour is compressed, it evaporates and dissapears. The air must be very humid to create such a dramatic display. Probably the result of a recent rainfall, the results of which we can see on the ground.
@nicolasdmg11 because as the speed of the engine goes up, the dynamic pressure also goes up, so the static pressure decreases a lot. At low pressures the water and almost all of other liquids boil al lower temperatures, so the water present in the air and in the ground around the engine is sucked and boil almost instantly. I hope you have understood. Cheers
That plane must have been secured to the tarmac. I would have thought that unleashing that much power would cause the plane to hop over those measly little chock blocks.
wow that last throttle up at 2.23 was awesome! its amazing how the air condenses at that velocity
These airliner engines are awesome.
Excellent video!
I've stood in about the same place and filmed one of our tests of the LM2500, which is basically a CF-6 without a fan and LP turbine.
It is so much quieter and less threatening than this video.
Possibly of interest: our LM2500 had a data plate stating its rated power was 34,800 Hp.
The CF-6's in your video are undoubtedly newer, and likely making even more power!
Jet engines are insanely powerful. Very cool video.
That is so scary ! The awesome power of a turbofan is quite humbling really.
I bet that's an AWESOME sound in person!!!
That's the kind of fan I need in my kitchen
Then it will be sucking things inside
Whoever you are who took this video you got balls of steel since it is scary yet bloody awesome to look at ,welldone.
its hungry for justin biebers
Yeah totally wicked, the noise alone gives ya chills.. Id love to be a mechanic for the airlines for just that reason!
Wow that is amazing! Raw power at its finest!
BESTIA HERMOSA DIVINA!!!! QUE PLACER ESCUCHARTE PURO PODER!!
What an acceleration!!!! Amazing!!!Think about the response of that engine!!!!Thrust, thrust, thrust!!!!
this is an awesome vid.
what I always wanted to see.
great pan (2:40) to see how far its draggin air from... and what it does to the atmosphere
Those sure are some strong little red chocks on the wheels ;-)
"I love the little tornado effect" It's just the moisture condensing into one focal point.
Oofta those things have some serious snort! I likey!!
the vortex in the engine is incredible.
Gotta love the high pressure vapes in there. Turbine engines are by far the coolest mechanical devices in the world. In my opinion anyway. =)
The 'white smoke' which is actually water vapor is the product of the engines pulling the air into what is a venturi (basically a narrow passage). In the venturi, to maintain equilibrium the air must either travel faster or the pressure must increase. Due to a not perfect system the result is some of both which causes the intake air to rapidly cool for a short time as it enters the intake. The cooling of the air causes the water vapor to condense which creates 'smoke' or more accurately a cloud.
The moisture looks crazy in there..very cool!
Love that vortex. Looks like a miniature tornado.
Such tiny chocks, such great raw engine power. And, as they say at work about properly securing our wheels, "Don't be a blockhead!"
I love this video. It is art, it is tech-porn, it is music... it makes me happy.
i love the boeing 767. Such a safe and beautiful plane
the moister of the warm air being ingested into the engine is condenced into vapor.That is why you see water. Almost like a cloud being formed in the sky,different air temp.
Had 3 of em on the MD11... I sure miss flying that bird and those CF6's
iv seen this done on a maxjet 767, scariest thing iv ever seen... was amazed how the headset man standing at the nose of the plane never got sucked in!
Thats got to be some strong bolts holding that engine inplace!
FINALLY an awesome run-up video! THANKS! Amazing... I love the CF6, and would love to see a GE90 at TO pwr...
@Jakeyboyshow Exactly. This is the same reason that engines being run when they have a guard on the front (such as say in a test facility) can only be safely run under certain constraints of temperature and humidity. Above a certain humidity, below a certain temperature, this process can cause ice to form on the front of the guard, eventually causing a semi vacuum behind it, and sucking the lot through the engine. Big, expensive bang.
there have been numerous engine ingestions, people getting sucked in. The result is pretty impressive, you can see them on the facebook group "official man gets sucked into a jet engine". I only say this as many comments suggest throwing folk into jet engines, im sure you would only say this if you are cool with the impending blending!
Awesome!!! great Vid, top the way it mimics Takeoff-Cruise-approach-landing all in three minutes ;-)
Yes, with the immense decrease in pressure in front of the fan blades, condensation occurs.
Nice little mini twister on the ground!
Nice job simtrav. Was in around the same area when they did the same test on an Atlas Air 747-400F a couple of months ago, although wasn't as close for fear of me becoming FOD.
@MikeyNCat- just for info,the fan blades are never running with transonic speed, not even at the fan blade tips.the drag at the fan blades would increase and the forces to the blades would be so huge,that as a result it could happen that the whole fan/engine would be destroyed.
Due to Divergent construction of engine intake duct, the air hits the leading edge of the intake and then 3 things happen: 1: The velocity of the air is greatly slowed down, 2: Air is pressurized, 3: The Air temperature is increased. All this before the air even hits the engine. Just by the shape of the intake....
They do this test BTW to test for vibration in the engine at various loads, as well as to check calibration of vibration sensors. For an engine output test they use the test cell across the road.
@Wahlsen and @MikeyNCat Actually, the tips of the fan blades not only go transonic, they go supersonic at about 80-90% power. At full power, blades tips can go Mach 1.5. So a lot of the blade actually goes supersonic, not just the tips. Also, destructive shockwaves do not form because of the duct surrounding the fan and the number of fan blades. That only happens with propellers and unducted fans. You can tell when the fan blades go supersonic by the loud growling/buzzing sound they make.
:-O thats amazing. The F15 is like the most powerful fighter in the world!
holy shit that was the most awesome thing ive seen all month! and the sound FTMFW!
Oh, she sounds so good!
Thanks to all of you who have answered my question. It was really helpful.
I'm just a pilot. We aren't around during maintenance but I believe the mechanics have to run the engine for 5 minutes after certain maintenance to check for leaks before signing the Return To Service.
I LOVE THE ARE AND FLYING IN IT!
yeah i saw the documentary about that. ill bet a good chunk of the passengers on board heard the bang. and get this, when they showed the wing of the A380 it had shrapnel damage, and the engine parts fell through a school on batam island and almost hit a kid. the engine pieces missed him by about 4 or 5 inches. and its not just oil leaks thatll cause a blast. compressor failure, over revvin, fuel leaks, or metal debris that got sucked in on take off
Truely Spectacular
most low hung engines have an air nozzle below the intake blasting air forward triggering a vortex .the idea is anything such as ice would spin around fast and be thrown away from the intake during taxi.
I don't think CF6's have that...
Usually you have another mechanic up there taking clearance checks with feeler gauge between fan blade tips and inlet housing....lol Just make sure the rope is strong enough to hold him..lol
Even though the minimum requirements say you dont even need A levels or a degree, most commercial pilots which are flying aircraft now were either in the Air Force or College graduates etc. You also have to do flying aptitude tests etc, and you use to have to get above 120 in an Iq test, the world average is 100 and genius is 140 + . You also have pass a medical examination. Your health, hearing and eyesight have to be good (as long as you have near 20 20 with glasses)
Now that is power my friend. Good Gawd!
@a090006 They're talking about the tangential speed of the fan blades. They do actually go supersonic even below full power. At full power, the tips of the fan blades move at about Mach 1.5!
@david2371 You cannot convert thrust to horsepower because you need torque and rpm to calculate horsepower. A turbofan engine does not produce any torque other than the torque needed to spin its own fan and compressors. It's only used to move air. However, you could look at the turboshaft version of the CF6-80C2, which is the LM6000. It's basically this engine without the fan and with more turbines to get all the work possible out of the airflow. It's rated at 57,330 shaft horsepower!
Dangerously close, but awesome!
This just be the coolest video in the history of youtube
How interesting seeing the little vacuum vortex!
What is it called when the moisture in the air condenses into the cloud material we see?
Thank you.
With camera zoom. He enhanced the zoom in his camera to make it look so close to the engine.
we had 3 of those bad boys on the MD11... that's 200,000 HP at your fingertips!
That reminds me of the A380 engine failure a little while ago - the failure was caused by an oil leak, but the intense heat of the oil fire apparantly caused one of the main turbine wheels to freewheel and break up - A380 engine failure over Batam Island
Capt Janeway "I think I spotted a new way to get back to the Alpha Quadrant... crew brace for impact!"
simply air moving fast at such a rate that it's starting to condense, that is why you see the water vapor before the engine even has a change to "compress" it. Basically the same thing that happens when air moves quickly over an aircraft wing at high angles of attack :)
I love how seemingly casual this peeing man is about the spiral vortex or death dead ahead...
It's a Vortex - From Wikipedia - A vortex (plural: vortices) is a spinning, often turbulent, flow of fluid. Any spiral motion with closed streamlines is vortex flow. The motion of the fluid swirling rapidly around a center is called a vortex. The speed and rate of rotation of the fluid are greatest at the center, and decrease progressively with distance from the center.
This engine is only demonstrating it's take off procedure. And does no harm whatsoever to the engine
Excellent ! I was looking for a new vacuum cleaner. I found it :)
wow its sucking the water off the ground. amazing.
This is really good for 240p i was surprised!
Fantastic power..love it!!
Reminds me of a spin drier, except your clothes won't come out dry in one piece.
sucking the humidity strait out of th air. Awesome
lol, I would like to see a racoon wander into that vortex on the ground :)
now thats tight! B767 4 life son!
Awesome POWER! Scary too.
whats that stream that looks like its shooting out vapour or something?... Is it like a mini tornado generated by the force of the engine?
the aircraft is tied down to the tarmac in a special area of the airport nice vid sounds like their testing that engine
hey that was awesome but it was scary too because when the 767 was increasing power the engine was shaking (well thats what i´ve seen)
Thats why you do an inspection for FOD first. Where else do you carry out these tests ??
absolutely AWESOME!
Dude thats awesome, hey whats up with the inside of the engine casing going blue at full throttle???
Wow pulling the water up and into the engine from the ground in front of the engine..
Now thats the straw i need for my drink!
I need a fan like that for the house.
the speed of the turbines and the water that is already on the gorund helps the generation of the vapor
thats true, and i think T/O power stands in the range of 80-90% but that could be higher if the plane might be close to or is at maximum take off weight. and yes you can blow a jet engine on a 767 just as easily as you can in your own street car by over revving the engine. only when a jet engine blows from high RPMs what youll see is alot of smoke, or worse the engine could explode violently
OMG they are shaking quite bad. Now you realize the power that the pylon possess LOL
BTW, what did they use to keep the plane in parking position? Cause if i'm not mistaken, the parking brake alone couldn't handle such massive force at take off power setting.
@texNoz so the reason the blades can exceed the speed of sound is because of the Duckting
Depends on which CF6 engine, the first CF6 can produce 40,000lbs of thrust and the newest reaching the 72,000lbs of thrust
Is that hard on the airframe? All that power with the plane on the brakes? Does it stress the airframe?
The air pressure at the inlet of the engine is extremely low due to the displacement action of the compressor stages, relative to the surrounding atmosphere. As the water vapour in the air reaches this low pressure zone, it condenses to form visible water droplets. As the vapour is compressed, it evaporates and dissapears. The air must be very humid to create such a dramatic display. Probably the result of a recent rainfall, the results of which we can see on the ground.
@nicolasdmg11 because as the speed of the engine goes up, the dynamic pressure also goes up, so the static pressure decreases a lot. At low pressures the water and almost all of other liquids boil al lower temperatures, so the water present in the air and in the ground around the engine is sucked and boil almost instantly. I hope you have understood.
Cheers
i love this video!! feel the power!!
If the plane jumps the chalks, Im sure that thing will eat you for a little snack
@Dizzle242 A miniature controlled tornado of sorts, I suppose. Thanks for the explanation.
the ultimate would be the blast fence ripping off
wow this engine is powerful
Mmmm...those chocks, blast fence and smoke stacks in the background could only mean you are on the QF Jetbase!
That plane must have been secured to the tarmac. I would have thought that unleashing that much power would cause the plane to hop over those measly little chock blocks.
0:25 you can really hear the distinct "buzzsaw" noise the fan blades are making
try standing behind it. the winds generated by the CF6 can hit speeds of 240-260mph and can send a school bus flying
Have you noticed how dry the ground is behind the engine? Nice hairdryer... :-)
Ahhhh so thats what those bad-ass barriers are for...