Two Days of Afterburner Testing

[@vrdengineering5204]

Glad to see you are still posting videos after all these years. This channel is youtube gold.

[@jlunde35]

I so appreciate waking up Sunday morning and witnessing an afterburner. You could call this channel Jay's Hot Rods. Thank you.

[@steveshoemaker6347]

AgentJayZ l am in my 80's now but l would love to light em up just one more time in my F-4 ....Thanks From an old Navy flying Shoe🇺🇸

[@AgentJayZ]

I will stick my neck out and speak for all citizens of Jet City: We all love to hear form you guys with experience operating these things for real. Thanks, and feel free to pass along stories...

[@donaldstanfield8862]

Thank you for zooming about on our behalf, glad you enjoyed it! Blue sSky's & Happy Landings!

[@Nope-ti4ec]

@@AgentJayZ what are some great textbooks and/or sources do you recommend for a jet engine hobbyist that is willing to keep learning throughout their life?

[@_Joy_Unleashed]

This never gets old!

[@scottbruner9987]

Thank you so much Jay, for letting us watch you turn money into heat and noise.

[@johngormley2192]

Very cool to see. Next one run at night. There is a region where the exhaust expands then contracts and repeats as it gets farther down stream. It's really cool to see.

[@AgentJayZ]

It's a test cell, not a KZbin show stage. Regular business hours only.

[@skeptical2649]

Shock Diamonds?

[@richardlincoln8438]

I appreciate the information that You bring forward, thank You for Your time and effort.

[@jk_46]

When I'm visiting a family member who lives near an airport I would hear the commercial jets take off and land and every now and then there would be this earth and ear shattering rumble and vibration, you can stick your fingers in your ears and it rumbles inside you and makes almost no difference. From what you said I'm probably hearing a fighter jet engine on a bench being tested with after burner on. Never have I ever heard something that loud, not even fighter jets doing a fly by was that loud. Cool video really enjoyed it

[@Porsche4life]

I’ve heard the same thing. I lived in Waco Texas near the military and general aviation airport KCNW. They had an old gulf stream gII they used for testing for the aviation mechanics program. I lived 20 mins away and the rolls Royce soey turbojets were so loud for that biznet jet you could feel the sound 8 miles away!

[@LiveLearnProjects]

Ahhh! This gets me even more excited to startup my little (comparatively) J34 in the next couple weeks. Finalizing fabrication of the fuel tank, fittings, and lines and we are ready to go! Thanks for sharing!

[@AgentJayZ]

We want to see that.

[@c1ph3rpunk]

Drives me nuts when I show up late and just get the afterburner, where’s the beforeburner post? ;-)

[@scottmarshall6766]

Thanks for bringing us along. I always enjoy your test sessions. It's on my bucket list to witness a test like yours. I keep telling my son, you got to go to an NHRA fuel event, words can't describe it. I'd guess a jet in afterburner is the same sort of experience.

[@SuperSecretSquirell]

That delayed ignition was violent. Love it!

[@dremwolf5419]

J-79 and TF-30 in full afterburner, absolutely love them!!!

[@Armafly]

My wife asked what’s so interesting in that crazy noise and some flames from a big pipe. I answered that for me it’s something magic like a poem.

[@AgentJayZ]

Yes. Many people think that these vids are pointless and boring. Society identifies this large percent of often the more intelligent portion of the population by a special designation. They are called women.😉

[@barbaradavis393]

@@AgentJayZ Shame on you! Not all women think that. I used to love watching the A-37 light up at work. They weren't quite the screamers that the Tweets were, but they could really set you up. :)

[@JEANSDEMARCO]

@@AgentJayZ Yep!! We all know who the real bosses are! 😅

[@grahamj9101]

Some years ago, the Director of Engineering at R-R Bristol was a woman ....

[@SkyhawkSteve]

thanks for the explanation of the delayed ignition! It reminds me of the "thump" of the F-106's afterburner. Decades ago, when I was stationed at MCAS Yuma, AZ, some National Guard 106's were deployed there for a few weeks. Whenever they launched, there was always a huge thump that rattled the barracks windows. A bit annoying, but still cool! 🙂

[@690_5]

Man, I love the CF-104, and I'm glad to see at least one Canadian J79 still working.

[@AgentJayZ]

The J79 was license built in Canada by Orenda. It was called the OEL 7, and there are a few still around. You can recognize them by their four strut front frame. All the other J79s have eight struts.

[@johnnycomelately6341]

Brilliant, it even blew the papers off my desk

[@robc3056]

My neighbours love the sound of a Afterburner in the morning !!!

[@MotoEPhil]

Ah the delayed light-off at 15:20 brings back memories. That's the sound I remember!

[@Jan_Seidel]

I have been on a flight show, where 2 Tornados passed the crowd in 400m distance. Afterburners running while brake flaps were fully engaged. Oh boy, that was an intense sensation. The legs of my trousers were rocking like crazy and the deep thunder could be felt in the intestines. btw. I would *LOVE* to see a video where you show more details of the mechanics controlling the exhaust nozzle positioning. In "J79 - Turbine Engines: A Closer Look" you just scratch on that topic but I would like to see more in depth how it is done. The mechanics look totally undersized for the raw power the engine blasts through the nozzle when not being in afterburner mode.

[@AgentJayZ]

Check out "the variable exhaust nozzle"

[@Jan_Seidel]

@@AgentJayZ Oh, seems I missed out that one. Cheers mate :)

[@grahamj9101]

Tut, tut. The RB199s in the Tornado didn't have afterburners: they had reheat.

[@Jan_Seidel]

@@grahamj9101 The RBB199 has an integrated afterburner... I have just looked it up on the manifacturer's site

[@grahamj9101]

@@Jan_Seidel Are you familiar with the phrase, 'tongue in cheek'? I take a devious pleasure in reminding our Transatlantic cousins that that they are not the custodians and arbiters of technical English, or the English language in general. After all, they can't even spell correctly, having been led astray by Noah Webster. As the renowned Irish playwright and author, George Bernard Shaw, reportedly said, "two countries separated by a common language." I just happen to have come across some publicity material from Panavia, the Tornado project management organisation, which describes the aircraft as powered by "reheated turbofan engines". And I can tell you that at, R-R Bristol, where I was responsible for in-service design support of the RB199 for a time, the engine was referred to as having reheat: it had a Reheat (not Afterburner) Fuel Control Unit. Nevertheless, I have to acknowledge the R-R has got it wrong at times. In 'The Jet Engine' book, of which AgentJayZ has a copy, Chapter 16 is headed 'Afterburning', and the first paragraph opens with the words, "Afterburning (or reheat) ....." Tut, tut.

[@zapfanzapfan]

Always a good visit to the temple of noise!

[@stephenjones2404]

Love watching you man keep up the good work!

[@claudiocarbone2225]

So awesome!

[@robpetrie9351]

Your “chem trail injector” comment had me literally laughing out loud. Life is hard and it’s harder when you’re stupid. Chem trail believers must have hard lives, indeed. Great content on your channel. Always educational as well as entertaining. Thanks for the videos.

[@jimporter7602]

Changed a torch igniter 20 minutes after a test cell run at Homestead AFB in 1970, was really hot had 2 blanks in the tail pipe while working J -79-17 from F 4E

[@trespire]

@Jim Porter Loved working in and around our F-4E Kurnass. Structural technician IAF in the early 90s on F-4 and others / Machnist fitter.

[@ChandramouliMallampalli99]

love from India, really hardcore engg with passion

[@EwingTaiwan]

17:20 I really love how you can see the rapid change of the inlet variable guide van (?) angle.

[@opera5714]

Got you beat. A couple months ago I was in the room with eight jet engines running at once. That made some noise. This was a 100MW generator, the only one like it in the world. Normally it is ten engines but two were out for repair. Where are the exhaust rings? Also designed the first portable computerized test cell for the F15.

[@AgentJayZ]

I do not present my videos as a challenge, nor as any sort of measuring contest.

[@robinsipe3108]

Next time you are at the bird roaster, check where the LM1500 engines came from........

[@AgentJayZ]

Dang! I was going to say something along those lines. But he's got me beat, so I have zero to give.

[@tomshelton435]

Gorgeous. Love to see afterburning turbo jet engines connected o the zed sled.

[@mrjerry316]

Wow .......Thank for sharing.

[@RGB06084]

Great video Agent Jay Z!

[@bobl78]

Is there a time limit how long the engine can be run in after burner is just the fuel the limit ?

[@AgentJayZ]

Only limited by the gas tank. One of the reasons I included that long AB pull at the end was to show that nothing overheats and nothing is overstressed.

[@lawyerlarrry]

Welp, this video was great (as always).

[@TheTherumble32]

What exactly in the engine makes the ringing/screaming sound. Is it the various stages of the compressor and the stator blades chopping the incoming air like an air raid siren.

[@AgentJayZ]

I think you got it. Good image you paint.

[@oscarzt1652]

15:23 holy smokes that was really cool

[@ronboe6325]

Lived in Duluth when they flew RF4's - loud. Now in Phoenix, the F35 is really loud. I'm a good 20 miles from Luke and now from time to time we hear them launch. Never heard the F15's. Whatever that engine is doing, it's much better at converting fuel to noise than the J79.

[@trespire]

F-15 are more or less as loud as a Phantom, but the pitch seems different, less of a deep rumble at high power. I was mostly around Phantoms.

[@AdamosDad]

One hell of a way to clear ice, water, soil, gravel, large rocks and even some subsoil from outside of the test cell.

[@HeliNerd1701]

Never mind ground clearance, that damned thing sounds like it alters the spin of the Earth when it's afterburner is lit 😁

[@AdamosDad]

@@HeliNerd1701 🤛🏼(▨_▨¬)🤜🏼 I'm feelin' it!

[@handymansteve]

jet wash alley gets 6 inches deeper every time they do a test run

[@AdamosDad]

@@handymansteve Ilove it! This is raw power unleashed.

[@handymansteve]

@AdamosDad REALLY expensive way to dig a ditch..... fun though, just don't ask for a specific shape to it, you get what you get

[@kv501]

I’d pay a decent amount of money just to spend the day watching those tests, completely staying out of the way and not bothering anyone.

[@AgentJayZ]

Well, it's the magic of editing that makes it look so interesting. This 23 min video is the result of two full days of this, that, and everything else. If you can make it to the TC and don't mind waiting sometimes hours... it could happen.

[@riad9042]

Just beautiful

[@soubanrafique9568]

Great work 👍🏻

[@ferrarikingdom]

I will clean your entire shop and everything in it to see this in person.

[@AgentJayZ]

That's why I make these test videos. We have a highly secure location, and our list of requested visitor applications for an afterburner test is now up to 88 thousand entries...

[@ferrarikingdom]

@@AgentJayZ looks like I’ll have to stick to flying p51s and p40 for my thrills. Hoping to get some t38 seat time soon so thankfully I’ll get some AB experience in person that way. Love and appreciate your videos !

[@JlerchTampa]

The only thing that could make this better would be a display of Fuel Flow per second and/or a running total of Fuel Costs for each run!

[@AgentJayZ]

Glass half full. Some of the other channels that record afterburning turbojets up close, for free... might make you happier.

[@18robsmith]

Thanks for de-waxing my ears so early in the morning

[@zapfanzapfan]

Jet wash alley is turning into jet wash canyon.

[@handymansteve]

wonder how deep it's getting?

[@Chris9rr]

XXXXXXXXXXXXXX Are you able to do an afterburner run during the night? Or do you local ordinance prohibits loud noise after a certain time of the day?

[@julianrichards1585]

Been there done that, Olympus 593 ( Concord engine ) doing certification test runs, idle to take off power with full reheat, disapponted not to see shock diamonds in the exhaust i suppose the camera angle was wrong?

[@AgentJayZ]

Well, then... this channel will be boring for you.

[@grahamj9101]

Compared to the J79, the Olympus 593 reheat (and thank you for not saying afterburner) was quite modest (32,000lb T/O dry, 38,000lb reheat). I helped keep Concorde's (mustn't forget the 'e') engines turning and burning at R-R Bristol for several years. PS The reheat was often referred to as the 'weeheat'. PPS If you want to see some pretty shock diamonds, try looking for some clips of Typhoons doing a night take-off. I had a hand in the design of the EJ200 engine.

[@AgentJayZ]

So if the 593s were working at min AB or "modest reheat", then they must have been almost powerful enough to push that big white bird supersonic without augmentation. Imagine the fuel consumption of four 593s at max possible reheat! Maybe 500 gpm? Short trips, 50 passengers, double the ticket price... Or it could have been a European B1, with in flight refuel capacity... Ah, the aviation imagination is getting away from me again. Tonight I'll be dreaming of formations of Three Concorde bombers at Mach 2.8, flanked by six CF-105 Arrows. It'd be like an episode of thunderbirds... burning about 3000 gallons of jet fuel per minute!

[@julianrichards1585]

@@AgentJayZ Not enough power without reheat ,use was very limited takeoff and punching through to Mach2. watching takeoff from behind in the rain was unforgettable.

[@zapfanzapfan]

From what I have read and seen, the reheat was used for getting through the trans sonic region faster but it could have been done without. Was what I have read accurate?

[@achimhanischdorfer3403]

On the topic of loudness: Worked on a construction site near an airport. We were less than 500m away from the run way. It was Memmingen Airport in Germany. Anyway. We are on lunch break on the roof of the factory building we are building and a Boeing 777 takes off. You could feel the vibrations in your stomach. I guess J79 is a different kind of loud... Still. It sounded the "normal" jet engine 'hum'. They run up the engines and the 777 accelerates down the runway. It goes past and the noise changed to the rumble of jet blast. It sounded like continous thunder. Then it picked up the nose and vanished into the low clouds

[@creamofbotulismsoup9900]

I know the feeling, I live somewhat close to Nellis AFB, they don't exactly have the same noise limits that commercial planes do. Get to see some pretty cool planes like the B2, though you would think a B2 stealth bomber would be quieter than it is lol.

[@donaldstanfield8862]

@@creamofbotulismsoup9900 The power of intimidation!🎯💥💨

[@donaldstanfield8862]

Those 777 engines are, what, five times higher trust? Isn't that incredible!? Great story and experience, thanks! 😉👋

[@MrBen527]

Those engines are high bypass. Most of the thrust is produced with the fan giving them a smoother less intense sound..

[@ajaychoudhary9817]

amazing just amazing

[@anthonymedford1837]

Beautiful

[@donaldstanfield8862]

This engins seems cleaner and shinier than I recall from earlier episodes, anyone else notice that!?

[@poiuytrewq8ff]

What a beast

[@KSparks80]

Any idea what the exhaust/wind speed is out behind that beast?

[@AgentJayZ]

Mach 1 at the exhaust nozzle throat, and it drops off exponentially with distance behind the engine.

[@pinkdispatcher]

Mach 1 at the throat relative to *local* speed of sound in the hot exhaust stream, and at 1200ºF, speed of sound is almost twice what it is at ambient temperature, so some 2000+ km/h would be a rough first estimate. In afterburner, the outer nozzle opens to create the diverging part of a converging-diverging (C-D) nozzle to accelerate the gas beyond local speed of sound in the diverging part. Since thrust is change in momentum, and momentum is linear with velocity, and the mass increase (fuel) in afterburner is low, we can assume roughly a 50% increase in speed for a 50% increase in thrust. So maybe 3000 km/h in afterburner?

[@Void304]

I'd like to see the bolts needed to pin a J79 in place.

[@firstnamegklsodascb4277]

there are much bigger bolts in your everyday life

[@AgentJayZ]

Playlist: Our Engine Test Cell vid: the engine test stand

[@HansStrijker]

I'm 14 minutes in, and still no sausages being barbecued! 😜

[@TCAerospace]

Amazing video! Do you have any clips of the actuators for the variable stator vanes on the J79 moving? Or do they not actuate while on the ground and stationary?

[@AgentJayZ]

Quite a few, in many of my test run vids. They handle compressor airflow direction for the first six stages. Whether the aircraft is moving or not does not affect their function.

[@Aviatorjoao]

How do I get a visit of the facility. Your content is amazing

[@honestspirit56]

Very nice 👍

[@marcwolf60]

I am sort of expecting that there is a sudden rip in time and space when you turn the afterburners on. :)

[@CaptHollister]

"Ooooh, chemtrail injector..... moron!" Perfect. Please elaborate on how we could arrange to pay you a visit so we can cross it off our bucket list.

[@AgentJayZ]

That's up to you. You have my location. I guess the next step is to find out when the tests happen. that's like predicting the weather. The best i can do is give a rough estimate on progress of a project. They usually take a few months. I get a one day notice for engine runs of J79's If they remember. Otherwise it's that morning, or iI miss it altogether and hear about it later.

[@dohc22h]

Which is louder? The Ignition of the Fuel or the Sheer Volume of Air being Moved?

[@dohc22h]

I suppose Volume of Air isn't the correct term to use... More like Pressure or something.. Loud AF I refueled F18c's in USMC.. like 109-121db at idle or something.. Incredibly loud

[@dohc22h]

What's the difference between Jet A and JP5? Is Jet A the Civilian Version of JP8 and JP5 having the Anti-freeze additive? Im just babbling.. haven't talked about this stuff in years.

[@AgentJayZ]

I would have to check with Wiki, or...

[@grahamj9101]

It's not the sheer volume, it's the sheer velocity - and the shear of that jet of hot gas interacting with the ambient air. That engine is moving only a fraction of the airflow of a big turbofan, but it's far louder.

[@TeemarkConvair]

so, a question; on the run when the AB did not ignite, why didn't the exhaust nozzles [turkey feathers] still open ? i assume [yes , i know how its spelled lol] the fuel rate/ pressures are the same regardless? They only opened slightly. thanks for the thunder

[@AgentJayZ]

The fuel control is very smart. One of it's inputs comes from a thing called the temperature amplifier. The nozzle area is adjusted by the Nozzle Area Controller, which uses temperature to decide whether or not to open up. If the nozzle was to open to reheat position without the fuel actually burning, thrust would drop to almost nothing.

[@jasb78]

Why is the afterburner section so short? Wouldn't that engine produce more thrust if the afterburner section was longer?

[@AgentJayZ]

The length is what it needs to be to get the job done. It's almost as long as the rest of the engine, so is that short?

[@grahamj9101]

It just might be that the afterburner section of the jet pipe is actually longer than necessary for installation reasons, in order to get the aircraft CofG right. If you want to see a shorter afterburner, try googling RB199 engine cross-section - and, by the way, we used the term 'reheat' at R-R Bristol.

[@jasb78]

@@grahamj9101 Reheat? I would call it "Dragon's Breath"

[@AgentJayZ]

Might be an idea to read the info section, or is it called the description these days...

[@LAMethWitch]

do you have any hearing or tinnitus issues J? thanks for this great video

[@AgentJayZ]

eh?

[@lerkzor]

@@AgentJayZ Classic 'dad joke'. Love it.

[@Moin___Khan]

15:21 flame punch👊

[@raygud]

if engine come loose on full power?

[@AgentJayZ]

It's mounted on a moving swing arm, attached to piezoelectric load cells, and moves about a half mm during the test. So it is loose already.

[@mixerm93]

I can only imagine how big the fuel bills were 💵💵💵

[@obsoleteprofessor2034]

Snow melt came early in the GWN.

[@manifold1476]

You could try putting a microphone between two earcups of a pair of ear defenders, and bring them firmly together.

[@AgentJayZ]

Like last time... Too much attenuation.

[@AdamosDad]

I also find it very hard to explain how loud it is to stand near the muzzle of an 8" gun when it is fired, or when a Terrier missile is launched from about 30 feet away or when an F-4 flies by supersonic at sea level. This is my roundabout way of saying I know how loud you're talking about.

[@jovertgacgac7675]

Until you witness the Space Shuttle launch.

[@pinkdispatcher]

Except sound pressure drops at inverse distance squared, and the closest you could be to a Space Shuttle launch was some 5 km. If you visit the test cell, you could be as close as 5 metres or less to the exhaust, so at least 1000 times closer, which means the Space Shuttle sound would have to be a thousand squared, or a million times louder to create the same amount of noise at your location. Sure, the Shuttle was a lot louder than the J79, but not a literal million times. Case in point, to watch a rocket launch from a safe distance, you don't need ear protection, whereas close to a J79 in afterburner, you would be completely deaf in seconds without it. I think AgentJayZ once said he wears both in-ear and over-ear defenders combined.

[@bushelfoot]

I bet they sped up the earth a little

[@drysori]

I would really like to see that white cloud of fuel and air dragons breath to ignite into a huge fireball

[@AgentJayZ]

If you've ever seen Shockwave, or any other jet truck at an air show, they purposely generate a huge fuel fog, and then hit the igniter on their afterburner, shooting flame straight into the cloud. It does not ignite. If you want a fireball, maybe run your jet truck demo on gasoline.

[@majobis]

@@AgentJayZ Yes i have seen the Shockwave Jet Truck at an airshow before and know exactly what you are talking about. Very cool and it is all about putting on a show. I have taken video's of the truck and have some cool pictures of it. I will also guess you would like to take a ride in that truck for giggles down the runway.

[@erikwestrheim804]

FFS. Favorite Fastest Shed....

[@skybaucom7659]

So Rad

[@PastelComGini]

12:35 I'm surprised for the lack of a warning saying "GET THE F*** OUT OF THE WAY!" on that white wall.

[@kevinmerrell9952]

LOL - chemtrails! A self-administered IQ test.

[@shoutout.kokain8713]

10:25 Hahahahah

[@danawick9817]

1000 liters thats what 12000 bucks??

[@AgentJayZ]

One of the fuel delivery receipts was for 4300.00

[@darkseid6412]

HEY GUYS, IT JUST RAINED OVER HERE AND MY DRIVEWAY IS WET AND I HAVE A GARAGE...I'M SURE WE CAN COME TO AN UNDERSTANDING

[@jeremy7923]

Don't wake the trolls!!! Lol

[@markrichards9646]

Believers in chem trails must get their info from flat earthers. Did I miss something? Where’s the howl?

[@AgentJayZ]

Ah, I must have not used the footage where I mention this is a late model J79, with clean-burning combustors, and a long petal nozzle that doesn't howl.

[@donaldstanfield8862]

@@AgentJayZ Awesome, hope your doggie is safe and well, too! Thank you!👊🏼

[@bigboybuilder]

was at a full mill power test for an F-4 scarry for a 120 pound runt like me the amount of air it ate. best I remember the radar screwed up when AB was on.

[@eddieeriksson5830]

KZbin decide to throw in adds every 4 min to make this interesting video unwatchable! Have you thought about expanding to more watchfriendly platforms like Floatplane from your fellow countryman LTT. KZbin keeps telling me to avoid adds by subscribing but I prefer to give my mony to a smaller alternativ. Love your videos

[@AgentJayZ]

Never heard of it, which is the problem. Also after reading their FAQs, it sounds a lot like Patreon ; You pay a membership fee to avoid having commercials.

[@bcrx7]

Pay the $12/month for premium... It absolutely does not make sense for AgentJayZ to be on floatplane.

[@Turboy65]

I see no ads at all. Install adblockers. And a hosts file with ad blocking entries.

[@AgentJayZ]

Old and Slow: you can do that, and if everybody did, I would make nothing from my work, so why would I continue? I don't like ads, and please notice I never have non-skippable ads, but any part time job that pays zero get dropped, eh?

[@Turboy65]

@@AgentJayZ It's not my fault that you have decided to try to use the internet as as a source of revenue instead of a real world job. I'm an internet fundamentalist, and the internet should be free and without ads. Always. When ads started intruding, I got pissed. Still am, even though I don't see many. The internet WAS my refuge away from advertising, for a time. But of course people have to fuck up all good things.

[@777RiverRacing]

Got to love turbines 🔥🔥🔥🔥 @777riverracing