We test run a J79-J1E with afterburner on a sunny, snowy, freezing cold day. There are a few new people with us, and they prove that "everybody loves afterburners !"
Ah, I remember that J79 sound well... from tarmac to EOR, for last pre-takeoff inspection--being behind two aircraft, each with two of those beasts at full AB, taking off in formation. Good thing the intake is full size, flaring outward... I'd still be beyond wary of walking anywhere near the front of that engine while at high RPM/thrust. I well recall feeling my fatigues or field jacket material being pulled toward the intake while crawling around under that plane during the last inspect of hydraulics/tires before boom and zoom time... Very cool. I'd like to order two of those with an F-4 around them, please. :-)
Hey, you just made a railway switch blower! No seriously, I'm a mechanic for CP rail, and one of my jobs is to maintain our jet blower truck. It's a semi truck with a Pratt and Whitney jet engine from an early model B-52 bolted onto the back. We use to to blow packed snow out of railway switches, where plows can't get to. If you search cp rail jet truck on TH-cam, you will find a video of it melting packed ice off of a snow plow.
Coolest videos I've ever seen... thank you so much! I've watched about 2 hours now non-stop. Thank you for taking the time to make this so informative, so high definition and with great narration. Hats off to you sir.
I guess the coolest thing about your videos is. That after all these years of life, blown away (literally,lol), by jet engines, and the mystery of how they are made and work, that you answer all those questions in a very educational and fun way. Thanks.
I worked at a classification rail yard during the mid-80's, in Galesburg, IL. The track maintenance group had a jet engine mounted on a piece of yard track equipment, that they would use to de-ice the various switches of heavy snow and ice. Only problem was, it would ALSO pick up ballast and bow them all over the place. If you SMART, you were far away when they fired it up!! :)
Fire suppression systems are part of the aircraft. None of the engines we work on have any type of fire extinguisher equipment. I only make videos to show the stuff we work on. I don't know anything about aircraft fire extinguishing systems.
Well, dude, you get the award for best question ever. As a matter of fact, your question is THE question, and it goes back to the very beginning. The limitations of jet power were laid out in 1928 by Frank Whittle, in his paper called "Future Developments in Aircraft Design". I once read it online.. But it seems to be difficult to find these days. If you read it, you will see that nothing we are doing today is beyond what Sir Frank was imagining back in the day...
Hi, first at all want to congrat to all your working crew in your shop! This nice engine looks is ready to install. This test shows me it is a good snow blower and melter! All your videos are awesome, please keep doing this job for all of us, not only in North America, but for the entire world! Remember I'm in Panama City, Panama and keep myself learning with your videos. FELICITACIONES DESDE PANAMA!
I used to work on the F-4 with these engines and ran them while in the cockpit lots of fun my most favorite A/C thank you for making this video and sharing
The J79 engine has been around for a very long time. I used to be a Jet Engine mechanic on the J-79 engine back in the early '60's. At that time that aircraft was the fastest thing in the skies.
the F104 starfighter, the mighty F4 phantom had two of them, I remember these as a kid... the B58 had 4, but I never saw one in person what else ran the J79?
The jet nozzle is what accelerates the exhaust gases to make thrust. It needs to be larger when the exahust is hotter through the use of the afterburner. So it is adjustable, and controlled by throttle position and exhaust gas temperature.
That's Robin running the throttle, and his actions are one of the input signals used by the fuel control. In the test cell, Robin plays the role of the pilot in the aircraft.
Good question. I am not exactly sure of the answer, but I think the flame basically begins in the eddys created by the flame holder rings. If that is the case, they don't melt because they are made of very temp resistant alloys, and they are cooled by the exhaust gases, which are about 800F... well below the melting point of those alloys.
Another great test, and some nice afterburner footage! Jay, please tell your whole crew 'hi' from the internet, and 'thanks for letting us see into your shop'
A few questions for the hi-tech guys: 1 - how much augmentation does a J79 get on full afterburner? 2 - how much more fuel does it burn on full afterburner? 3 - how long can you keep the afterburner going before something breaks? 4 - what's the white horn on the air intake for? 5 - what are the petals on the exhaust for? (they seem to open and close randomly) 5 - finally, how much fuel did you guys burn on this test? By the way, congrats. Great video.
All of the answers you seek are easily found, except maybe 2 and 5b So: 2) 85 - 90 gallons per minute 5b) We didn't measure a total... but around a couple hundred gallons of JetA
Yes, we have to be careful to avoid icing conditions, because ice or frost can build up on the struts, then fall into the compressor, and as ice chunks, cause damage much like rocks would. Icing is possible at temps around or just above freezing, and at high humidity. We are in a very dry region here, and in winter it is usually so cold the air can't hold enough humidity to form ice.
I don't know where this is in our country.....but it's on my bucket list for sure! Just the sheer power! Just awesome! I fly model turbines and they are impressive enough as it is. :-)
The start cart peaks the mic. Then the engine starts, then we go a hundred time louder to full dry thrust. Then we go another hundred times louder in afterburner. The audio recording is hopelessly slammed into "meaningless" even before the big engine gets going.
Holy shit! You lucky, lucky man. I know you do your best to provide us videos of these events, but I'm sure nothing does it justice like being there. Thank you again!
"Secret" test cell?! Ha-Ha! That's funny AgentJay! I know where it's located but nevertheless the videos are very interesting. You and Robin are very generous for sharing the details with us viewers. Those "other guys" at the other test facilities would never give such an in depth look at how things work. My brother whom is a pilot for private jets also found these videos very fascinating! Keep 'em coming!
S&S Turbines is a company that builds, overhauls, and repairs gas turbine engines... for customers who own and use them. Then we test them... at our test cell facility, located where there are no neighbors for miles.
Well, that's our benchmark, but the critical temp is 300K. A degree Kelvin is one degree celsius, starting from absolute zero. Room temp is about 293K. Thing is, with synthetic turbine oils, when you apply a high speed rotation in a plane perpendicular to the rotation of the supporting substrate at any temperature below 300K, chronons are destroyed faster than they can be replaced by the decomposition of heatilons. This results in time running backwards, and it's something we really try to avoid
I wanted to edit Robin's name in once I saw you rattle off the team but it wouldn't allow it. It's great how you try to respond to all the questions. Good stuff!
This is your best, or at least near-best J79 video yet! It ranged from the vane/stator & exhaust cone actuators to the A.B blasting snow to chicks giving the 'Thumbs-Up'! Maybe you can just 'post' the full A.B. thrust reading on that console in a comment, instead of trying to video it. Great job & thanks again. Regards, Darren PS: Looking forward to A I video!
More fun than any human should have but I won't tell. BTW, don't tell anyone but I did a J-79 at the Mojave AP in tandem with a F-100 in MIPCC config. Only did stage 4 AB though. Thanks for the videos!
Awesome pictures and sound! I have goosebumps everywehere :-) Think the results are clear: Winner: J79 - Snow: comes off as second-best ;-) Thanks again for up filming and uploading!
when big Al mentioned that he could feel the engine pulling him, it gave me goosebumps. every time you walk near the front of a working jet engine i cringe. i think i'd have serious issues getting near the sucking end of one of those things. meanwhile that jetwash looks particularly fun to jump in to.
At idle, 25 feet back, the wind is about 80mph, and 500 degrees F... it feels like putting your arm in front of a propane torch. You want to check it out at full power... I'd suggest a minimum 100 Yards behind, and the aforementioned chrome snowsuit. I'm betting there are some difficulties.
I know you can't divulge, but I can only hope it's going in a 104! I hear Starfighters in Florida bought a few more from Italy so I think they're up to nine now. Got to see them fly as a two ship display. Super cool.
Yes, you are right. I never noticed... but it's not a horse, just a poorly placed plastic bag covering up the front bearing of the Spey. The things you guys see ! I never even looked there...
The nozzle closes at high throttle to maximize exhaust gas pressure and velocity, thus increasing thrust. The nozzle opens when under afterburner because otherwise there would be too much pressure.
the patterns in the flame at full reheat is what's called Mach diamonds which is the air is traveling supersonic and you're seeing super sonic shock waves, when you hear a military jet over head or at an airshow and you hear a cracking sound that is also super sonic shock waves. Ohh how I love the sound and smell of jet engines. having played (see some of my early video's) with model jets there's not much that beats it
There is no such thing in a J79 as a fuel dump. The only fuel dump I know of is when an aircraft opens a drain valve and, well, dumps its fuel. The puffs of smoke I think you mean are when the throttle gets pushed all the way to military, and bumps a little past into min AB. Since we have a manual ignition in our test cell, the AB fuel will flow out the back as a white mist if the ignitor is not activated. In the aircraft, AB ignition is automatic.
If you're talking about the diamond/disk shaped pattern that rocket engines and certain after burning jet turbine engines produce, then you want to look up something called a "Mach disk" or "Shock Diamond". It's basically a standing wave that appears in supersonic exhaust plumes, driven by the exhaust flow being either over or under expanded. One of the best examples would be to look up a picture of the Pratt & Whitney J58 used in the SR-71 or the XCOR XR-5M15 video on TH-cam
There's a picture I saw on a forum one day of some polish soldiers with a half built Mig-15 on a train car, they would use the jet engine to clear snow and ice from there railways where the drifts were really bad.
Those patterns are called mach diamonds and are caused when the exhaust is supersonic. If there are no mach diamonds in the exhaust, it stands to reason that the exhaust isn't supersonic.
Man, the throttle response on that thing--from (what I assume is) flight idle to full (non reheat) thrust and back in around a second! And that's 40-year-old tech! :)
Anyway, thanks for all the great videos. I'll never have to be a jet tech but the information is fascinating. Tell your coworkers thanks for saying hello to the internet. We're not that scary, just fascinated. It's really good stuff.
I'd wondered about that, all that snow would suggest (to me in Australia where this doesn't happen) that ice could form, but then when all the humidity in the air has fallen on the ground, that's much less of a problem. I take it small particles like rain drops and snow flakes aren't a worry if they're ingested. Thanks!
Never seen it in person myself, but have seen photos at my old airbase, RAF Alconbury, of a J-79 bolted down into a heavy truck for the purpose of blowing snow off the runway. Woulda been wild to see that in person.
Are the throttle inputs during the run completely manual from the bloke running the test, or is it some sort of pre-recorded run from a previous flight to best simulate the kind of input that the pilot would be giving?
AnythingThat consumes fuel at over a gallon per second is going to be a fire-breathing dragon of a machine, and a bit of smoke or fuel mist is to be expected... I was in an Embraer 190 a few weeks ago, and when they started one of the TF34 engines ( a much more modern and sophisticated engine than the raging beast that is a J79 ) the whole plane was enveloped in a giant cloud of smoke.
The microphone is already so saturated with noise, toggling the afterburner didn't even seem to register! I'd have to be around for one of these tests someday.
Too bad you couldn't find a J-57 from a CF101 Voodoo so you could flick your bic. The afterburner lighting on those was very impressive. I worked them as an Aero Engine Tech 511at 416 Sqn at CFB Chatham, New Brunswick from 182 to 1984. Best posting I ever had.
That start cart an the engine when its frist getting started it is at 1:23 that would be a good pic just saying it says alot drages up good memories if someone knows what there looking at ... if the pic was big enough it look good on that white shipping container in the 1:23 shot just saying ...a nother great video 👍👍👍👍
"Shock diamonds form when the supersonic exhaust from a nozzle is slightly over or under-expanded, meaning that the pressure of the gases exiting the nozzle is different from the ambient air pressure. The exhaust is generally over-expanded at low altitudes where air pressure is higher, and under-expanded at higher altitudes. As the flow exits the nozzle, ambient air pressure will either expand or compress the flow; over-expanded flow is compressed while under-expanded flow expands..." wiki..
You don't have to thank us for watching. I have to thank you for making these great videos.
I enjoy it when people enjoy what I offer.
I agree
Edit: i'm the 50th like on your comment
My neighbors hate this dudes videos.
To answer the burning question... It absolutely blends! Love the sound of a J79!
well there goes my complete salary in fuel for the next 10 years!
Hell of a snow blower
Ah, I remember that J79 sound well... from tarmac to EOR, for last pre-takeoff inspection--being behind two aircraft, each with two of those beasts at full AB, taking off in formation.
Good thing the intake is full size, flaring outward... I'd still be beyond wary of walking anywhere near the front of that engine while at high RPM/thrust. I well recall feeling my fatigues or field jacket material being pulled toward the intake while crawling around under that plane during the last inspect of hydraulics/tires before boom and zoom time...
Very cool.
I'd like to order two of those with an F-4 around them, please. :-)
Vietnam?
Hey, you just made a railway switch blower! No seriously, I'm a mechanic for CP rail, and one of my jobs is to maintain our jet blower truck.
It's a semi truck with a Pratt and Whitney jet engine from an early model B-52 bolted onto the back. We use to to blow packed snow out of railway switches, where plows can't get to.
If you search cp rail jet truck on TH-cam, you will find a video of it melting packed ice off of a snow plow.
Coolest videos I've ever seen... thank you so much! I've watched about 2 hours now non-stop. Thank you for taking the time to make this so informative, so high definition and with great narration. Hats off to you sir.
"I'm always blown away by these tests" Haha yeah literally! ;-)
Love your video's man, they are super interesting.
***** Thanks, and welcome to Jet City !
I guess the coolest thing about your videos is. That after all these years of life, blown away (literally,lol), by jet engines, and the mystery of how they are made and work, that you answer all those questions in a very educational and fun way. Thanks.
I remember that day also,my grandson was born. Looks like everyone had a great day! Keep those tests coming.
I worked at a classification rail yard during the mid-80's, in Galesburg, IL.
The track maintenance group had a jet engine mounted on a piece of yard track equipment, that they would use to de-ice the various switches of heavy snow and ice.
Only problem was, it would ALSO pick up ballast and bow them all over the place. If you SMART, you were far away when they fired it up!! :)
This engine proved that with enough power even a brick could fly. Two of these in the F4 Phantom.
Yea, that's about the right glide ratio.
Fire suppression systems are part of the aircraft. None of the engines we work on have any type of fire extinguisher equipment.
I only make videos to show the stuff we work on. I don't know anything about aircraft fire extinguishing systems.
We need a pub next door to our shop !
Well, dude, you get the award for best question ever.
As a matter of fact, your question is THE question, and it goes back to the very beginning.
The limitations of jet power were laid out in 1928 by Frank Whittle, in his paper called "Future Developments in Aircraft Design".
I once read it online.. But it seems to be difficult to find these days.
If you read it, you will see that nothing we are doing today is beyond what Sir Frank was imagining back in the day...
Yes! The law states that the more heat and pressure you create, the louder it's going to be.
Welcome to Canada !
Did a really good job of capturing the intensity of the afterburner. Nice video.
Saw this video this morning on All Things Aero's Facebook page. You've made the big times Jay!
Hi, first at all want to congrat to all your working crew in your shop! This nice engine looks is ready to install. This test shows me it is a good snow blower and melter! All your videos are awesome, please keep doing this job for all of us, not only in North America, but for the entire world! Remember I'm in Panama City, Panama and keep myself learning with your videos. FELICITACIONES DESDE PANAMA!
I used to work on the F-4 with these engines and ran them while in the cockpit lots of fun my most favorite A/C thank you for making this video and sharing
The J79 engine has been around for a very long time. I used to be a Jet Engine mechanic on the J-79 engine back in the early '60's. At that time that aircraft was the fastest thing in the skies.
the F104 starfighter, the mighty F4 phantom had two of them,
I remember these as a kid...
the B58 had 4, but I never saw one in person
what else ran the J79?
@@stinkyfungus Israeli Kfir used the J79
When your dad gets you to shovel the front yard but you’re feeling lazy
The jet nozzle is what accelerates the exhaust gases to make thrust. It needs to be larger when the exahust is hotter through the use of the afterburner. So it is adjustable, and controlled by throttle position and exhaust gas temperature.
Nozzle area control is carried out by the engine's fuel control, using temperature measurement of the exhaust gases as one of the inputs.
That's Robin running the throttle, and his actions are one of the input signals used by the fuel control.
In the test cell, Robin plays the role of the pilot in the aircraft.
definitely in my top three most fun to watch test cell runs . watched like 8 times since you uploaded it.
Good question. I am not exactly sure of the answer, but I think the flame basically begins in the eddys created by the flame holder rings. If that is the case, they don't melt because they are made of very temp resistant alloys, and they are cooled by the exhaust gases, which are about 800F... well below the melting point of those alloys.
Recommended to me after 7 years, and the algorithm never disappoints.
good god its just that deafening roar that just freaking bad ass.
Awesome video. Looks like you have a great and effective team, too.
Another great test, and some nice afterburner footage!
Jay, please tell your whole crew 'hi' from the internet, and 'thanks for letting us see into your shop'
It's an amazing machine, somebody put in their wrench time. It would be a pleasure to meet you one day and get a tour of the shop.
A few questions for the hi-tech guys:
1 - how much augmentation does a J79 get on full afterburner?
2 - how much more fuel does it burn on full afterburner?
3 - how long can you keep the afterburner going before something breaks?
4 - what's the white horn on the air intake for?
5 - what are the petals on the exhaust for? (they seem to open and close randomly)
5 - finally, how much fuel did you guys burn on this test?
By the way, congrats. Great video.
All of the answers you seek are easily found, except maybe 2 and 5b
So:
2) 85 - 90 gallons per minute
5b) We didn't measure a total... but around a couple hundred gallons of JetA
Yes, we have to be careful to avoid icing conditions, because ice or frost can build up on the struts, then fall into the compressor, and as ice chunks, cause damage much like rocks would.
Icing is possible at temps around or just above freezing, and at high humidity.
We are in a very dry region here, and in winter it is usually so cold the air can't hold enough humidity to form ice.
I love these man. Never gets old!
Me too. In ten years, I've only missed one J79 afterburner test run...
I don't know where this is in our country.....but it's on my bucket list for sure! Just the sheer power! Just awesome! I fly model turbines and they are impressive enough as it is. :-)
This is the second time I've been sent a jet engine video at a time stamp where the engine was screaming and peaking the mic. Gets me every time
The start cart peaks the mic. Then the engine starts, then we go a hundred time louder to full dry thrust. Then we go another hundred times louder in afterburner.
The audio recording is hopelessly slammed into "meaningless" even before the big engine gets going.
Holy shit! You lucky, lucky man. I know you do your best to provide us videos of these events, but I'm sure nothing does it justice like being there. Thank you again!
man that is cool seeing how afterburners work and see how the turkey feathers on the nozzle work to provide the thrust to go supersonic
Dude... the jetwash.. the actual exhaust stream... is certain instant death.
MAN THAT IS JUST SICK, EXTREME, WILD AND CRAZY HORSE POWER!!!
Hey... uh, that was ME who said that, and he already knows that. Cheers.
Some of the afterburning engines we test here are sent to South America for use in aircraft.
"Secret" test cell?! Ha-Ha! That's funny AgentJay! I know where it's located but nevertheless the videos are very interesting. You and Robin are very generous for sharing the details with us viewers. Those "other guys" at the other test facilities would never give such an in depth look at how things work. My brother whom is a pilot for private jets also found these videos very fascinating! Keep 'em coming!
What a great way to clear your driveway!
Just came over from Plane Savers (Bobby sent me) and WOW! You got me from Afterburner!
Loved and Subscribed.
S&S Turbines is a company that builds, overhauls, and repairs gas turbine engines... for customers who own and use them.
Then we test them... at our test cell facility, located where there are no neighbors for miles.
thanks for making these, badass behind the scenes stuff is SICK!
Well, that's our benchmark, but the critical temp is 300K. A degree Kelvin is one degree celsius, starting from absolute zero. Room temp is about 293K.
Thing is, with synthetic turbine oils, when you apply a high speed rotation in a plane perpendicular to the rotation of the supporting substrate at any temperature below 300K, chronons are destroyed faster than they can be replaced by the decomposition of heatilons. This results in time running backwards, and it's something we really try to avoid
I wanted to edit Robin's name in once I saw you rattle off the team but it wouldn't allow it. It's great how you try to respond to all the questions. Good stuff!
This is your best, or at least near-best J79 video yet! It ranged from the vane/stator & exhaust cone actuators to the A.B blasting snow to chicks giving the 'Thumbs-Up'! Maybe you can just 'post' the full A.B. thrust reading on that console in a comment, instead of trying to video it. Great job & thanks again.
Regards,
Darren
PS: Looking forward to A I video!
Oh my god, I am seriously in love with these engines.
More fun than any human should have but I won't tell. BTW, don't tell anyone but I did a J-79 at the Mojave AP in tandem with a F-100 in MIPCC config. Only did stage 4 AB though. Thanks for the videos!
Awesome pictures and sound!
I have goosebumps everywehere :-)
Think the results are clear: Winner: J79 - Snow: comes off as second-best ;-)
Thanks again for up filming and uploading!
Great Team-- One Hella've Job-- Thanks Jay.
You guys are amazing. Thank you for making this videos
when big Al mentioned that he could feel the engine pulling him, it gave me goosebumps. every time you walk near the front of a working jet engine i cringe. i think i'd have serious issues getting near the sucking end of one of those things. meanwhile that jetwash looks particularly fun to jump in to.
Oh you have a snowblower, that's nice, we have a jet engine.
It pushes just as hard when it's in the aircraft. The thing is designed to push against its mounts.
At idle, 25 feet back, the wind is about 80mph, and 500 degrees F... it feels like putting your arm in front of a propane torch.
You want to check it out at full power... I'd suggest a minimum 100 Yards behind, and the aforementioned chrome snowsuit.
I'm betting there are some difficulties.
I know you can't divulge, but I can only hope it's going in a 104! I hear Starfighters in Florida bought a few more from Italy so I think they're up to nine now. Got to see them fly as a two ship display. Super cool.
Yes, you are right. I never noticed... but it's not a horse, just a poorly placed plastic bag covering up the front bearing of the Spey.
The things you guys see ! I never even looked there...
It's a Anti-Elsa weapon!
You're like offending elsa, but very funny though.
The nozzle closes at high throttle to maximize exhaust gas pressure and velocity, thus increasing thrust. The nozzle opens when under afterburner because otherwise there would be too much pressure.
If you built a Snowman (or a few in a line) in the exhaust path it would be sooooooo cool to see how long they lasted!! :D
Cheers for the vid!!
Pilot has a power lever, and selects anything from flight idle to max AB. Engine handles how that is accomplished.
Noisy and inefficient at low speeds but I'll be damned if it isn't more beautiful to watch and listen to than a turbofan...
Im just here working on a paper work school, completely unrelated to this video but thank you for sharing your craft
the patterns in the flame at full reheat is what's called Mach diamonds which is the air is traveling supersonic and you're seeing super sonic shock waves, when you hear a military jet over head or at an airshow and you hear a cracking sound that is also super sonic shock waves.
Ohh how I love the sound and smell of jet engines.
having played (see some of my early video's) with model jets there's not much that beats it
There is no such thing in a J79 as a fuel dump. The only fuel dump I know of is when an aircraft opens a drain valve and, well, dumps its fuel.
The puffs of smoke I think you mean are when the throttle gets pushed all the way to military, and bumps a little past into min AB. Since we have a manual ignition in our test cell, the AB fuel will flow out the back as a white mist if the ignitor is not activated. In the aircraft, AB ignition is automatic.
I love how brown the snow gets from the exhaust.
+MrRatFinkster I believe it's actually pulverized dirt from the divot the afterburners dug in the ground. I thought it was unburnt fuel at first, too.
+Arthur Compton I believe it's soot from burnt fuel in the exhaust stream. That's what it looks like when you get up real close to take a look at it.
Don't forget the fibreglas long johns, and chrome snow suit !
If you're talking about the diamond/disk shaped pattern that rocket engines and certain after burning jet turbine engines produce, then you want to look up something called a "Mach disk" or "Shock Diamond". It's basically a standing wave that appears in supersonic exhaust plumes, driven by the exhaust flow being either over or under expanded.
One of the best examples would be to look up a picture of the Pratt & Whitney J58 used in the SR-71 or the XCOR XR-5M15 video on TH-cam
There's a picture I saw on a forum one day of some polish soldiers with a half built Mig-15 on a train car, they would use the jet engine to clear snow and ice from there railways where the drifts were really bad.
Yes, I think I might have described that in "our engine test stand"... let me know if I didn't OK?
Wow, That's is truly awesome, it even melted the snow.
I can't really do that. What I do show is already pushing the limits. You don't want my test cell videos to end completely, do you?
Those patterns are called mach diamonds and are caused when the exhaust is supersonic. If there are no mach diamonds in the exhaust, it stands to reason that the exhaust isn't supersonic.
Quite possibly your greatest video. Ever.
And yes, i'm pretty sure i've watched all of them!
The control room is not in the plane of rotation of the turbine disks, for the very reason you mention.
Man, the throttle response on that thing--from (what I assume is) flight idle to full (non reheat) thrust and back in around a second! And that's 40-year-old tech! :)
The J79 is kind of a legend among aircraft engines...
Anyway, thanks for all the great videos. I'll never have to be a jet tech but the information is fascinating. Tell your coworkers thanks for saying hello to the internet. We're not that scary, just fascinated. It's really good stuff.
That's trippy af..
That being inside a fighter jet..gosh
they are called shock diamonds, and there's a pretty good article in wikipedia on the topic
I'd wondered about that, all that snow would suggest (to me in Australia where this doesn't happen) that ice could form, but then when all the humidity in the air has fallen on the ground, that's much less of a problem. I take it small particles like rain drops and snow flakes aren't a worry if they're ingested. Thanks!
Many good books on that subject are far better sources than me.
Never seen it in person myself, but have seen photos at my old airbase, RAF Alconbury, of a J-79 bolted down into a heavy truck for the purpose of blowing snow off the runway. Woulda been wild to see that in person.
Yep. There's a piezoelectric load-cell on each side to measure thrust.
Thanks for another fine lesson!
Are the throttle inputs during the run completely manual from the bloke running the test, or is it some sort of pre-recorded run from a previous flight to best simulate the kind of input that the pilot would be giving?
Yes, but will it blend?
No but it can cook the shit out of anything you put in front of the exhaust!
@@HuntersMoon78 Yeah... HotShots-Style BBQ!
awesome videos. surprised the shop floor doesn't take flight
I love you guys.
" We are going to burn it all."
AnythingThat consumes fuel at over a gallon per second is going to be a fire-breathing dragon of a machine, and a bit of smoke or fuel mist is to be expected...
I was in an Embraer 190 a few weeks ago, and when they started one of the TF34 engines ( a much more modern and sophisticated engine than the raging beast that is a J79 ) the whole plane was enveloped in a giant cloud of smoke.
The microphone is already so saturated with noise, toggling the afterburner didn't even seem to register! I'd have to be around for one of these tests someday.
An afterburner is beautiful to look at
The speed and power, mingled with the heat makes me think of standing beside a tornado of flame or something.
Too bad you couldn't find a J-57 from a CF101 Voodoo so you could flick your bic. The afterburner lighting on those was very impressive. I worked them as an Aero Engine Tech 511at 416 Sqn at CFB Chatham, New Brunswick from 182 to 1984. Best posting I ever had.
The only engine that could possibly be more impressive than a J79 in 'burner (short of an F-119 or F-135) would be a J75.
J75....as in Avro Arrow Prototypes J75....cool.
That start cart an the engine when its frist getting started it is at 1:23 that would be a good pic just saying it says alot drages up good memories if someone knows what there looking at ... if the pic was big enough it look good on that white shipping container in the 1:23 shot just saying ...a nother great video 👍👍👍👍
"Shock diamonds form when the supersonic exhaust from a nozzle is slightly over or under-expanded, meaning that the pressure of the gases exiting the nozzle is different from the ambient air pressure. The exhaust is generally over-expanded at low altitudes where air pressure is higher, and under-expanded at higher altitudes. As the flow exits the nozzle, ambient air pressure will either expand or compress the flow; over-expanded flow is compressed while under-expanded flow expands..."
wiki..
Thanks for your words. Many countries have these airplanes, special air forces.