@@satishavasthi8906 0:26 there's a compressor stall on engine #3. It shoots flames briefly. This can happen in this very specific instance where hot combustion air directed from the reversers at a low forward speed gets ingested.
Jet engines don’t technically “backfire” but they do experience what we call compressor stalls. Which is what we witnessed on #3 while the TRs were deployed. We used to get them in flight and it sounded and felt like a quick low thump.
... and is usually not harmful to the engine. An adjustment to the variable stator system is required to eliminate this problem. It looks dramatic, but is not a big deal.
The Boeing C-17 Has one of the strongest Thrust Reversers, Hence why it can land on such a short runway. Sounds insignifigant, but those thrust reversers can take the C-17 up a 2% slope in beckwards, which is unheard of for a plane anywhere near that size. Hope this helps!
They're really beautiful and clean on the inside too. Super wide space and polished white floors, brightly lit. Netting everywhere. Flew into and out of Iraq in these. Gorgeous planes.
In about 2004 I was parked (DC-10) nose to nose with a C-17 on the ramp in Kuwait. I was in the cockpit and curiously watched the C-17 crew close up the plane and start the engines with no tug attached. Sure enough, they backed it up, got clear of us and taxied out. It is expeditious, but engine damage could be caused by sucking up debris propelled forward to the intakes by the reversed thrust.
Yep. I live on the Kitsap Peninsula near Gig Harbor and we see these all the time. All three of my boys will run outside whenever they hear them or any other military aircraft.
Reverse thrust works by diverting air from the fan to vents on the side of the engine. A jet engine does not have the capacity to reverse spool. This is because it isn't symmetrical from a front to back perspecitve. Compressor and turbine stages serve a different purpose.
Depending on data from the engine management, it might be as simple as "within limits, no inspection required. Return to service" And honestly with the pilots continuing their movement, I would be willing to bet that the engine stayed within operating range. At most their will be an inspection if the inlet.
@@norbertsiewert3917 “…same C141…”? The video shows only a C-17. C-141s have been retired. Most have been recycled, the rest are static displays/museum artifacts.
I remember flying in these while arriving in Afghanistan. When we crossed into the border of the country, we began flying evasively Like a damn fighter jet!, I was a soldier and my first trip to war, it was fun! '07!
@@enocmusic486 , no, no loops at all. Just seriously wild flying! We nose dived from a high altitude to a very low one, we began banking and things like that. It was crazy maneuvering for a plane so dang big but fun as could be!
@@catmeifyoucan4649 , honestly I wont watch anything on it, any more. Because yes, it has all become sickening. I am trying my best to focus on the good in life now. Anyone reading this, check out Ralph Smart videos, Reverend Ike, or Nevill Goddard! Life changing stuff! War is hell and can hang on to you if you let it, I'm letting go, God is in me!
I want to thank all the crew chiefs that had to change all the tires after that short landing and the engine troops that had to troubleshoot the comp stall.
Close, but it’s a disruption of the air entering the compressor (the blades you see at the front of the engine), not the turbine (which is at the back).
@@mattmarzula - Well, first of all it would be the compressor. That’s the spinny part with all the blades at the front of the engine where the air goes in. The turbine is at the back, and usually not particularly visible unless you’re looking directly up the tailpipe. Second, the only thing you see getting sucked into the intake is air and condensed moisture from a suction vortice created by the extreme pressure drop due to the tremendous amount of air being drawn in by the engine operating at high power and low (or negative) forward speed.
It is when the airflow over the compressor blades becomes turbulent, disrupting airflow to the combustion chamber and often resulting in a brief flame out, a bang and flames both forward and aft of the can! The most common causes of compressor stall are damaged or wrongly positioned guide vanes, high demand at high altitude, slamming the thrust forward or leaving reverse thrust in at too low an airspeed and ingesting the turbulent airflow from the reverser.
Well as a military jet engine mech, I would say that it puts stress on it backing up but not as much stress on it as it would be trying to stop it going over 200 knots for a landing. I wouldn't say it's bad, it just shortens the amount of "Time On Wing" for those engines. But if that a/c is slotted for doing demonstrations and will be backing up frequently, engine time changes are already forecasted ahead of time.
Typically, high bypass turbofan engines reverse only the fan bypass air to slow an airliner during landing. These P&W engines reverse the core exhaust as well providing enough reverse thrust to back up and not roast whatever the C-17 is backing toward.
The C-17 is powered by four fully reversible, F117-PW-100 turbofan engines (the Department of Defense designation for the commercial Pratt and Whitney PW2040, currently used on the Boeing 757). Each engine is rated at 40,400 lbf (180 kN) of thrust.[23] The thrust reversers direct the flow of air upward and forward. This reduces the probability of foreign object damage and provides reverse thrust capable of backing the aircraft. "wickipedia"
it very well could have been FOD(most likely a bird strike if it was FOD), but i think it actually may have been a compressor surge, not back fire, or engine pop, I am a AVN tech in the CAF.
C130s can do this two in fact that was the first aircraft I saw do this and of course a Harrier does this in flight but much slower. USAF mostly airlift, recons, and fighters.
What you are seeing is a compressor stall. We used to have a Delta dc9 every morning it came in on the runway behind our engine shop and you would hear the compressor stall. It had 100% hot thrust where as what you witnessed is only 20% hot thrust and 80 % cold thrust with the cold thrust going around the engine to keep it quiet and be fuel efficient.
Thrust reverses can be pretty hard on an engine. Not by their operation, but by all the shit they kick up on the ground. It all gets blown in front of the engine, then sucked into it... That was an AMAZING short field landing though, those pilots can fly!
The puff is caused because the engines are at high power but unable to get as much air as they want because of the low speed. If they were going faster (forward) there would be more air available being compressed into the engine.
Likely a compressor stall caused by injestion of hot exhaust gases into the engine intake. Hot air is thinner than cold air and a sudden burst of hot air can disrupt the pressure inside the engine and pop, you get a stall. How do I know? My dad was the Senior Flight Test Engineer for propulsion systems on the C-17 Project.
It's just a small flame out, happens alot, it won't damage the engine, it was pretty small. That plane's engines have reverse thrust so the engine is practicly made for it.
It looks like the engine draws something in (water) just before the flame out. There is a video on youtube of a C-17 with a small tornado of water being sucked into the engine, although no flame out. This looks similar, so it could be water on the runway being drawn in.
Most commercial aircraft don't allow full reverse below around 60 it's because the intake re-ingests the exhaust gases which can easily vacuum up crap on the runway. But their engines are almost all close to the ground. It might not be as bad for the c17 because the engines are up high but I could see it still being a risk and that's what this looks like.
Years ago, I saw Boeing 727 taxing backwards from ramp. Mind you, that's way cool to see them go backwards on reverser alone. Made terimal windows shake with power.
Awesome catch! Would you be okay with me featuring this in my series Weekly Dose of Aviation? Of course you will be credited both in the video and in the description. Thanks!
The flame-out from compressor stall happens at 0:27 . At 0:22 something is visible coming OUT of the front of the cowl of #3 engine - a narrow stream of fluid (😆) which drops out of the outboard side of the cowling, twice in succession in a second or two. Is that excess fuel from the stall? Excess fuel in the engine resulting from the stall would cause that flame out... correct?
What you are seeing is a vortex of condensation (think of it as a mini tornado) and the drop of air pressure causes the moisture to cloud up. Nothing drops out of the inlet when it is up on power. It’s sucking in air like there is no tomorrow. The surge (or compressor stall) would be caused by the huge disruption of airflow. Surges are quite spectacular and very loud. Depending on the engine design, they can be really destructive. Edit - And no it is not a ‘flame out’. The engine never spooled down but rather had a cough.
Not a flameout but compressor stall.. This can happen when hot, turbulent combustion gasses are ingested. It can happen specifically as demonstrated - where low forward speed and high power thrust reversing is being used. It's rare but possible, and demonstrated here. It's not as much fuel related as it's reingestion related.
Anybody else spot the vortices from #3 heading to the ground? That compressor stall may have been caused by FOD: Foreign Object Damage from something sucked-up from the runway.
Reverse thrust is what makes this plane go backwards. Most jets that have reverse thrust, will do this. Turbo props can be reversed, and might cause the plane to go backwards, after slowing to a stop.
The C-17 was designed for this stuff, im not too up-to-date with engine specs but im pretty sure this was just a mishap that can happen at anytime. If it wasn't good for the engines, I dont think they would allow them to use it in a demonstration. But thats just my opinion.
The combustion gases never go forward. All enters the conpressor and exits as advertised when reversing. The C-17 uses it's high fan bypass air (meaning, bypassing the compressor) And is deverted forward via areodynamic blockage (using blocker doors that deploy when the cowl slides back). It damn sure looks like a stall, but definately not due to any back pressure on the compressor. Just a disturbance on in the airflow coming in.
Could there also be hot gas ingestion? That would produce big problems with a rapid shift in the inlet air density due to hot gas ingestion. Mass flow through the compressor would drop and perhaps the IGV or VSV controls can't respond quickly enough. I don't know much about the Pratt & Whitney F117-PW-100 engines, but I do know about other engines that suffered comp stalls due to hot gas ingestion from missles or VTOL operations.
I would think he had the whole runway. That plane was designed for short-field operation, and can take off and land in a short distance, even in the desert.
@@budspaulding7121 in the vast majority of cases, no. Can it be bad enough to cause a tear down, yes... but that is the exception. There are times that a comp stall can be so minor that the only thing you need to do is check the computers to ensure all parameters stayed within limits, at which point you can just return the acft back to service
The most frequent compressor stalls I have witnessed was with turbine driven ground power units. They only had a single stage centrifugal compressor; there could be several stalls before the engine achieved full power.
Backfire? Looks more a compressor stall.
Not 'backfire' or 'engine stall' but thrust reversers in action.
Back fire ? Jet engine ?
40 years in aviation maintenance that was a compressors stall.
@@satishavasthi8906 0:26 there's a compressor stall on engine #3. It shoots flames briefly. This can happen in this very specific instance where hot combustion air directed from the reversers at a low forward speed gets ingested.
@@satishavasthi8906, Nope, compressor stall.
Jet engines don’t technically “backfire” but they do experience what we call compressor stalls. Which is what we witnessed on #3 while the TRs were deployed. We used to get them in flight and it sounded and felt like a quick low thump.
Was on an MD-80 winter time landing in Denver, and #2 studered with TR's deployed!! Grounded for MX...
@@kcsthebetterway Sounds like boroscope time!
@@kcsthebetterway As a Navy sailor thank you for your service.
I never saw any back fire. When was it?
@@actsismmljcorrectlyobeyed6190 winter of 1988.
This plane truely is amazing. To be able to stop that fast and go backwards so fast is so cool. They're fun to jump out of too!!
Cadillac of the sky.
At an air show I saw an A-10 hover in mid air whilst flying into the wind.
You can get your whole team on the ramp to exit simultaneaously.
And get paid to have all that fun! I miss the good ole days!
AATW!
... and is usually not harmful to the engine.
An adjustment to the variable stator system is required to eliminate this problem.
It looks dramatic, but is not a big deal.
@ModernSoldier97 bruh
Oh my God I'm reading a random comment and look at the author, it is THE AGENT JAY Z I've been watching your videos for years you're the coolest
15 years ago, wow
OMG I love your videos dude!
Our '72 Vega probably backfired once in a Blue moon also, and it was just as Dramatic as this.
That wasn't dramatic though? Also looking at a Vega drag car locally ironically.
Cmon. A 72 Vega was dramatic just because it existed.
Lol
Vega is Spanish for 'bottom.'
Some marketing agent didn't do his homework
🤣
The Boeing C-17 Has one of the strongest Thrust Reversers, Hence why it can land on such a short runway. Sounds insignifigant, but those thrust reversers can take the C-17 up a 2% slope in beckwards, which is unheard of for a plane anywhere near that size. Hope this helps!
They're really beautiful and clean on the inside too. Super wide space and polished white floors, brightly lit. Netting everywhere. Flew into and out of Iraq in these. Gorgeous planes.
that thing needs no clearance for pushback... it IS the clearance.
Actually, several jets can reverse thrust out of their boarding gate and do when no tug is around for push back.
As a jet mech, my first time dealing with a compressor stall had me more nervous than I like to admit.
Bust out the borescope.
RUclips: great time to throw this video into recommendations. 16 years... I haven't seen this before!
Thrust reversers…they have blocker doors that redirect airflow through grates which are angled to push the air in a forward direction.
In about 2004 I was parked (DC-10) nose to nose with a C-17 on the ramp in Kuwait. I was in the cockpit and curiously watched the C-17 crew close up the plane and start the engines with no tug attached. Sure enough, they backed it up, got clear of us and taxied out. It is expeditious, but engine damage could be caused by sucking up debris propelled forward to the intakes by the reversed thrust.
Interesting!
If the ground crew does a good FOD walk.... But ... You know...
@@Bramon83 I know. Lived in the M.E. for 10 years. FOD is part of the landscape.
Boeing supplies it's own fod when delivering airplanes. Idea don't pay them until fod free
Fyi, no mirrors required, Loadmaster opens rear cargo door and directs the pilot.
Being close to them at McCord afb in WA it's astonishing they can even fly. They're huge. Almost c-5 huge. "BIG GIRL CAN RUN"
Yep. I live on the Kitsap Peninsula near Gig Harbor and we see these all the time. All three of my boys will run outside whenever they hear them or any other military aircraft.
Reverse thrust works by diverting air from the fan to vents on the side of the engine. A jet engine does not have the capacity to reverse spool. This is because it isn't symmetrical from a front to back perspecitve. Compressor and turbine stages serve a different purpose.
How powerful are the engines?
Enough to take off backwards in reverse thrust
Amen, I was fully convinced it would defy physics and happily fly backwards.
That flash at 0:27 while reverse thrusting,
Ground crews are going to be pissed about pulling that entire turbofan off
Depending on data from the engine management, it might be as simple as "within limits, no inspection required. Return to service"
And honestly with the pilots continuing their movement, I would be willing to bet that the engine stayed within operating range. At most their will be an inspection if the inlet.
I have seen the same C141 take off and leave the next day. Perhaps the crew was not even aware of what has happened.
There were a series of 4 said flashes from :21-:27
@@demonknight7965 Those were vortices caused by the air intake.
@@norbertsiewert3917 “…same C141…”? The video shows only a C-17. C-141s have been retired. Most have been recycled, the rest are static displays/museum artifacts.
I was under the hood of my old Chevy trying to set the timing when it backfired through the carb and burned half my hair off.
Had a bbq burp fire from a crappy burner that had a lovely failure, similar results.
I missed those dsys of tuning my 1970 Leyland Spitfire or 62 VW Bug...now a days you need a labtop computers to tune up these divas.
That beast can break faaaast that’s amazing thanks for sharing
I remember flying in these while arriving in Afghanistan. When we crossed into the border of the country, we began flying evasively
Like a damn fighter jet!, I was a soldier and my first trip to war, it was fun! '07!
Did it make any loop
Thank you for your service. What's happening now must be absolutely sickening to you. God will get the people at the top, believe me.
Why would it be "sickening" to him? He said "war is fun."
@@enocmusic486 , no, no loops at all. Just seriously wild flying! We nose dived from a high altitude to a very low one, we began banking and things like that. It was crazy maneuvering for a plane so dang big but fun as could be!
@@catmeifyoucan4649 , honestly I wont watch anything on it, any more. Because yes, it has all become sickening. I am trying my best to focus on the good in life now. Anyone reading this, check out Ralph Smart videos, Reverend Ike, or Nevill Goddard! Life changing stuff! War is hell and can hang on to you if you let it, I'm letting go, God is in me!
I love watching these fly over my house. There is a base near me so I get to see them coming in low.
This is RAAF Richmond base in Sydney, I been here before, it’s not kinda that far from Windsor
I want to thank all the crew chiefs that had to change all the tires after that short landing and the engine troops that had to troubleshoot the comp stall.
I like the part where the engine backfired.
This is called a compressor stall. The air isn't flowing evenly into to turbine
Close, but it’s a disruption of the air entering the compressor (the blades you see at the front of the engine), not the turbine (which is at the back).
I was thinking can a turbine back fire?
Sure. And here I thought it was all that shit being sucked up into the turbine... 0:21
@@mattmarzula - Well, first of all it would be the compressor. That’s the spinny part with all the blades at the front of the engine where the air goes in. The turbine is at the back, and usually not particularly visible unless you’re looking directly up the tailpipe. Second, the only thing you see getting sucked into the intake is air and condensed moisture from a suction vortice created by the extreme pressure drop due to the tremendous amount of air being drawn in by the engine operating at high power and low (or negative) forward speed.
"Keep an eye on that #3 engine... it's running a little hot."
(Flashing light on instrument panel reads:"A Little Hot"😁)
Despite the spelling error, nice "Airplane" callback.
@@dalethelander3781 Well, at least I'm seated and facing forward... but I'm not on any instruments! ;D
It is when the airflow over the compressor blades becomes turbulent, disrupting airflow to the combustion chamber and often resulting in a brief flame out, a bang and flames both forward and aft of the can!
The most common causes of compressor stall are damaged or wrongly positioned guide vanes, high demand at high altitude, slamming the thrust forward or leaving reverse thrust in at too low an airspeed and ingesting the turbulent airflow from the reverser.
That plane went in Reverse faster than I can do a car.
Well as a military jet engine mech, I would say that it puts stress on it backing up but not as much stress on it as it would be trying to stop it going over 200 knots for a landing. I wouldn't say it's bad, it just shortens the amount of "Time On Wing" for those engines. But if that a/c is slotted for doing demonstrations and will be backing up frequently, engine time changes are already forecasted ahead of time.
Typically, high bypass turbofan engines reverse only the fan bypass air to slow an airliner during landing. These P&W engines reverse the core exhaust as well providing enough reverse thrust to back up and not roast whatever the C-17 is backing toward.
Kept looking for the clamshell reversers eg tf 33
@@Gator141a C-17 PW2040 engines have special reversers internal to the turbine exhaust case...louvers in the case wall angle the exhaust forward.
The C-17 is powered by four fully reversible, F117-PW-100 turbofan engines (the Department of Defense designation for the commercial Pratt and Whitney PW2040, currently used on the Boeing 757). Each engine is rated at 40,400 lbf (180 kN) of thrust.[23] The thrust reversers direct the flow of air upward and forward. This reduces the probability of foreign object damage and provides reverse thrust capable of backing the aircraft. "wickipedia"
first reply after 14 years.... good job!
I remember that moment well, RAAF base Richmond, NSW AUSTRALIA
Indeed it was, I was there also. This definitely broke something important as it was there for weeks after the air show
it very well could have been FOD(most likely a bird strike if it was FOD), but i think it actually may have been a compressor surge, not back fire, or engine pop, I am a AVN tech in the CAF.
0:22 DID YOU SEE THAT FUEL FLOWN OUT FROM THE FRONT OF THE ENGINE 3????
It's not fuel, it's an engine vortex
@@nos06 OH , THANKS
Awesome!.. we get RAAF C17's but I didn't know it could reverse like that!.. thanks from NZ 👍✈️
Glad you liked it!
An incredible airplane and it has reverse. I have never seen an airplane fo this before and I was in the USAF although mostly B52s.
C130s can do this two in fact that was the first aircraft I saw do this and of course a Harrier does this in flight but much slower. USAF mostly airlift, recons, and fighters.
MD90 can reverse too
I remember when I was on flight radar 24 i found The USAF c17 and a a380 b747 in one day
Wow, that beast got some good superbrakes
Oop, that's a compressor stall.
What you are seeing is a compressor stall. We used to have a Delta dc9 every morning it came in on the runway behind our engine shop and you would hear the compressor stall. It had 100% hot thrust where as what you witnessed is only 20% hot thrust and 80 % cold thrust with the cold thrust going around the engine to keep it quiet and be fuel efficient.
Jt8 engines are low bypass, not turbojet!
@@Sterlingjob I was thinking all the big engines were high bypass. Thank You for letting me know
@@matchthat5053 👍🏻
Thrust reverses can be pretty hard on an engine. Not by their operation, but by all the shit they kick up on the ground. It all gets blown in front of the engine, then sucked into it... That was an AMAZING short field landing though, those pilots can fly!
Turbine engines don't backfire. They have compressor stall on occasion though. Which is what happened here.
Amazing how quick that big plane can takeoff and how short it can land and stop.
Can't believe this was 2006
The puff is caused because the engines are at high power but unable to get as much air as they want because of the low speed. If they were going faster (forward) there would be more air available being compressed into the engine.
Is that a...
Is that a...
Is that a SUPRA!!!!!!!
Amazing !
Thank you for the video .
Looks like FOD got in to the engine around the 28 second mark
yeah, i dont think that was a regular backfire. hope they inspected that engine before next flight
Compressor stall.
Likely a compressor stall caused by injestion of hot exhaust gases into the engine intake. Hot air is thinner than cold air and a sudden burst of hot air can disrupt the pressure inside the engine and pop, you get a stall. How do I know? My dad was the Senior Flight Test Engineer for propulsion systems on the C-17 Project.
Stunning capture! May I feature this clip in one of my next episodes? Of course with a link back to your original video. Cheers!
Hi, I've sent you an email.
Me; Planes can’t fly in reverse.
Air Force pilot; Hold my martini.
Amazing capture ! Would you mind if I use part of this video , in one of my next episodes?Of course with a link back to your original video. Peace!
When you have to absolutely positively get down and back out of there immediately
I remember seeing these built in long beach ca.
Hi neighbor, me too.
It's just a small flame out, happens alot, it won't damage the engine, it was pretty small. That plane's engines have reverse thrust so the engine is practicly made for it.
It looks like the engine draws something in (water) just before the flame out. There is a video on youtube of a C-17 with a small tornado of water being sucked into the engine, although no flame out. This looks similar, so it could be water on the runway being drawn in.
16yrs ago and I see it now!
its the fan being made so the airflow switches direction, most planes if not all can do the same thing
that is osme powerful reverse thrust and a extremly short landing
This was at the RAAF base
(Royal Australian Air Force)in Richmond, New South Wales, Australia
Most commercial aircraft don't allow full reverse below around 60 it's because the intake re-ingests the exhaust gases which can easily vacuum up crap on the runway. But their engines are almost all close to the ground. It might not be as bad for the c17 because the engines are up high but I could see it still being a risk and that's what this looks like.
Debris would have nuked the engine
That’s a hell of a pull and pray game.
Excellent display of aviation technology
That happens a lot on the C-141's.. now retired. I used to see it all the time in Germany.
That is so rad!!!!!!
Yeah,that's a real C-17. Not the fake 1109 INFLATECH C-17 shown in the news last week.
Ha ha inflatable aircraft look very fake, that was real
Get a small screwdriver and tweak that carby . Do it now !
104 comments. One shows. Nice.
Well, I hope by now someone educated this user what backfire and reverse thrust is on this jet.
While reverse thrusting you can see engine #3 backfire slighty for 2 frames just past 27 seconds. Also says so in the discription...
Yeah, I’m also confused why it says there are so many comments but there’s actually 4...well now 5
Years ago, I saw Boeing 727 taxing backwards from ramp. Mind you, that's way cool to see them go backwards on reverser alone. Made terimal windows shake with power.
Impressive for direction change, reverse thrusters, reversing in t-10 seconds
Awesome catch! Would you be okay with me featuring this in my series Weekly Dose of Aviation? Of course you will be credited both in the video and in the description. Thanks!
Hi Lucass, sure you can! I look forward to seeing it in your mix. Appreciate the credit too.
he acctually diverts 70% of the thrust backwards while still keeping the engine spinning the same way
Really good video quality for 2006
That's a compressor stall
He can BACKWARDS HOW
The flame-out from compressor stall happens at 0:27 . At 0:22 something is visible coming OUT of the front of the cowl of #3 engine - a narrow stream of fluid (😆) which drops out of the outboard side of the cowling, twice in succession in a second or two. Is that excess fuel from the stall? Excess fuel in the engine resulting from the stall would cause that flame out... correct?
What you are seeing is a vortex of condensation (think of it as a mini tornado) and the drop of air pressure causes the moisture to cloud up. Nothing drops out of the inlet when it is up on power. It’s sucking in air like there is no tomorrow. The surge (or compressor stall) would be caused by the huge disruption of airflow. Surges are quite spectacular and very loud. Depending on the engine design, they can be really destructive. Edit - And no it is not a ‘flame out’. The engine never spooled down but rather had a cough.
Not a flameout but compressor stall.. This can happen when hot, turbulent combustion gasses are ingested. It can happen specifically as demonstrated - where low forward speed and high power thrust reversing is being used. It's rare but possible, and demonstrated here. It's not as much fuel related as it's reingestion related.
As David said, it’s condensation in a vortex - you can see another a few seconds after the stall by the #2 engine.
I was at a air show once and that happened to the c17 there too
RUclips recomended it 16 years later...
I've seen the c17 land and do so many great things. What a great plane
Hello, your video is amazing! Can I feature it in my project? Full credit will be given. Thanks!
Interesting how the number 3 engine seems to wobble before the stall. Might be a blade release and subsequent out of balance and compressor stall?
The engine couldn't handle how power this plane is
I remember the first time
I flew in one of these.
Amazing aircraft.
Did they ever do a "tactical landing" on you?
Reverse gear: the most important device when it comes to war! The greenhorn likes the idea. 🙂
Wow, that seems very cool.
Wow, amazing clip! May i use this in a compilation video Im making? I will of course link back to your original clip in the description :)
Whaaa??? No, the engine DOES NOT reverse its rotational direction. That is NOT what thrust reversers do; not even close.
Anybody else spot the vortices from #3 heading to the ground? That compressor stall may have been caused by FOD: Foreign Object Damage from something sucked-up from the runway.
Incredible PILOT !!!!
Reverse thrust is what makes this plane go backwards. Most jets that have reverse thrust, will do this. Turbo props can be reversed, and might cause the plane to go backwards, after slowing to a stop.
You don’t generally run engines in reverse like this as the pick up FOD which can damage them.
@@Sterlingjob True. I just stated how it could be done. Not a normal practice.
@@walterfink9782 showmanship I guess!
@@Sterlingjob Yes!
Backwards thrust with 2nd engine from left delivering a "backfire" nice....
I’m glad they’re got it in safe and sound. God bless you all. 🇺🇸🇺🇸🇺🇸❤️❤️
The C-17 was designed for this stuff, im not too up-to-date with engine specs but im pretty sure this was just a mishap that can happen at anytime. If it wasn't good for the engines, I dont think they would allow them to use it in a demonstration. But thats just my opinion.
That was a compressor stall
Text book
nice reverse thrust!!!!!! i think probably some sand from the side of the runway got into the engine making it to "back fire"
The combustion gases never go forward. All enters the conpressor and exits as advertised when reversing. The C-17 uses it's high fan bypass air (meaning, bypassing the compressor) And is deverted forward via areodynamic blockage (using blocker doors that deploy when the cowl slides back). It damn sure looks like a stall, but definately not due to any back pressure on the compressor. Just a disturbance on in the airflow coming in.
Cold Stream Reverser
C17: I can reverse on my own 😏
Air force planes: say whaaaaat 😲
Could there also be hot gas ingestion? That would produce big problems with a rapid shift in the inlet air density due to hot gas ingestion. Mass flow through the compressor would drop and perhaps the IGV or VSV controls can't respond quickly enough. I don't know much about the Pratt & Whitney F117-PW-100 engines, but I do know about other engines that suffered comp stalls due to hot gas ingestion from missles or VTOL operations.
I would think he had the whole runway. That plane was designed for short-field operation, and can take off and land in a short distance, even in the desert.
Jet engines do not backfire. What you saw was a compressor stall. Wish I had a dollar for all that I saw when in the air force.
Does an incident like this one require a teardown of the engine?
@@budspaulding7121 in the vast majority of cases, no. Can it be bad enough to cause a tear down, yes... but that is the exception.
There are times that a comp stall can be so minor that the only thing you need to do is check the computers to ensure all parameters stayed within limits, at which point you can just return the acft back to service
The most frequent compressor stalls I have witnessed was with turbine driven ground power units. They only had a single stage centrifugal compressor; there could be several stalls before the engine achieved full power.
Such an amazing piece of cropped video.