Jet Engine Run: Right Behind It

[@bobqzzi]

Those shots straight up the pipe of full after burner are crazy. Bravo. Thanks for posting

[@jdos2]

Seeing the afterburner bits cooling down after they shut it off was amazing!

[@jreid641]

Those things are terrifyingly loud! I never get tired of watching these videos.

[@carpetbomberz]

Never gets old, evar. Always something new to try, something new to see. I thought it was cool to see the hot spots on the exhaust liner after the afterburner dis-engages, a constellation of little red rings.

[@AgentJayZ]

Those rings are the flame holder. It has been even more visible in some of my other J79 AB test vids.

[@peterbrown6224]

Fascinating. I'm trying to imagine the smell, too.

[@Pugjamin]

Canadians are just like us brits with units “it’s -4° Celsius and I’m 200 yards away” 😃

[@AgentJayZ]

We switched to metric when I was in grade ten. Our neighbors never will, and they are kind of a big deal n the world. So most Canadians are bi-systematic. We regularly mix the two. Today I was a bit more old-school than usual. In my field, you need to be fluent in both. Just don't ask me what a furlong is, or a hogshead, or a stone... How much is a stone? Like 12 and a half pounds ? How many grams in a stone?

[@HappyHarryHardon]

Everyone uses the metrics but the US, Liberia and Burma.

[@slidey1788]

The switch to metric went without an ounce of trouble....

[@ianmangham4570]

Imagine a mole on a cold winters day passing through/under jet wash ally, all of a sudden a nice warm feeling of heated soil above you 💯🤟⚡

[@AgentJayZ]

I once watched a raven fly over the jet stream about 50 yards back on a bitterly cold day. It circled back, even though is was deafeningly loud out there. Not sure if it was enjoying the heat, or if it was using it to gain altitude like a glider pilot in a thermal...

[@shoutout.kokain8713]

I’ve been waiting for this video for eight years. Today was a good day thanks J

[@donrideout4919]

Reminds me of my days running engines in Cold Lake.😊

[@grahamj9101]

I'm both alarmed and impressed by those two guys feet away from the engine in full reheat - sorry, afterburner. Their eardrums obviously needed all the protection they could get, but what about their innards? I've only ever been close to an engine on test with it running at idle, and my recollection is that I could feel it in my chest and the pit of my stomach.

[@justindetta1]

That's me on the left! It's hard to focus your eyes when doing a final leak check. Let's just say it's a little uncomfortable haha

[@zapfanzapfan]

I saw an RR Avon RA2 cut up on display at my local technical university and thought of you. That must be a rather unusual display piece?

[@janne65olsson]

@@justindetta1 Thanks for sharing. It is awsom then getting info from first the ones that were experians it. 😎👍

[@michaelmurray11189]

9:17 That’ll certainly warm you up in a hurry. On another note, one time when I was up in the observation tower at the Udvar-Hazy Center, I was actually wondering what it must’ve been like to see or even hear Concorde when she took off out of Dulles.

[@grahamj9101]

PS I've only ever been to Canada once, and that was in November 1975, for a visit to R-R Canada. I recall that we flew in to Dorval over the part-completed Olympic Stadium. The first snow had fallen and, to get from my hotel to the R-R Canada plant at Dorval, I was loaned a big American station wagon, which wouldn't start. The concierge helped me out and got a good tip. How I actually got to the plant, driving on the wrong side of the road, in a totally unfamiliar vehicle, I really can't recall. It had automatic transmission, of course, and , being a Brit, that was another unfamiliar feature.

[@obsoleteprofessor2034]

Amazing that as simple as the compressor, turbine appears to be, fuel scheduling from a non computer control has to be so precise so the engine is not destroyed.

[@realulli]

About the sound recording... you might want to chat with some of the guys commenting on Scott Manley's video, "Why do rockets 'crackle'". Those guys set up cameras and microphones rather close to a launching orbital class rocket. I think they left their equipment closer than you were from your engine... They calculated the maximum possible sound level and concluded it was less than the microphones were rated for. (The maximum possible noise level at sea level is about 197 db, everything else just rises the ambient pressure. Reason for that is, at that volume, the "troughs" between the individual sound waves create vaccum, pressure can't get lower than that. If you try to be louder, the zero level of the wave just rises...)

[@sciencefordreamers2115]

Unbelievable view!

[@christinadaly7743]

How do you keep all the Kids on bikes away ? Me and some friends made trips to the Rocketdyne facility when I lived in Southern California as a kid , what a treat to watch and listen as the ground shook ! Your a good Man for taking the time to pass this on , someday it will all be just history .

[@AgentJayZ]

All of our neighbors are very far away, and we're surrounded by large open farmer's fields. Sounds like you were a happy, lucky kid. Everything is history. When I started typing this, that was the past. I will finish it in the future. The "now" is just a vanishingly small amount of time, always advancing into the unknown.

[@LiveLearnProjects]

Great stuff! Videos unfortunately no matter how they are filmed won't realize the volume and intensity of these turbojets experienced first hand. I ran my J34 full throttle for the first time and it was spectacular! A fraction of the intensity compared to a J79 with an afterburner!

[@leodikinis7390]

Fantastic my friend! Thank You!

[@UKAviationMovies]

Awesome video as always. Something I've noticed when I'm out shooting jets is they tend to sound quieter directly behind than they do off to the side. I recently caught a B-1 taking off from a rear aspect and the reflected sound to the side (from buildings) was actually louder than the sound directly from the motor. Does anyone know why this would be? Weird phenomenon.

[@dsdy1205]

Wild guess: The sound comes off perpendicularly from the plume of exhaust gases, and a lot more of the plume's area is presented to you from the side. Same reason it's easier to see an AB plume from side-on

[@UKAviationMovies]

@@dsdy1205 Love that answer! 👍

[@stargazer2504]

I'm guessing it's the same phenomenon but the same thing happens with police / ambulance sirens. When the cop car is directly behind you, you cannot hear the siren as loud, but if you were off to the side but still in front, the siren sound is much louder. This is taught to rookies in academy to show the "why aren't they pulling over" reason might be because they can't hear the siren.

[@leeharris3061]

Sweet!! Thanks👍🏻 Hello from Minnesota

[@jkenny1]

If you wanna share the full sound experience I suggest looking at getting a used PCM recorder for around $100 (and "dead cat" fluffy wind break for it), it should have a lot better dynamic range than the piddly mems or electret mics put in phones and consumer cameras. If you really want to splurge, a dynamic mic like a Shure SM58 should be incapable of "clipping" even for very loud sources like that (but very understandable if that's outside your hobby budget!). I got a pair of RE20 mics for someday recording a rocket launch with if I can catch one, they worked quite well for fireworks sounds at least. Thanks for all the great videos and bringing us these experiences!

[@AgentJayZ]

I've tried an SM57, but the results were useless. The fluffy things do not reduce distortion from levels, but only eliminate wind noise. I've got one of those Zoom things, but even with recording levels at 1% and full compression, it's no better than my camera mic with a piece of tape over the mic. I keep experimenting. My main difficulty is the sound is better at 200 yds plus, and the visuals are best at 20 yds or less.

[@AgentJayZ]

Hey, if 1080 isn't enough for you, go ahead to the other channels that post real jet engine tests. I think it's time for you to upgrade your viewing experience.

[@erickborling1302]

Two things I know NEVER come across in any recording: 1) a majestic pipe organ 2) a jet engine.

[@AgentJayZ]

I am the second half. Your first half is Rob Scallon.

[@ChrisB257]

That worked extremely well :)

[@ianmangham4570]

Looks about a FURLONG away 🤣🤟

[@burlatsdemontaigne6147]

Fantastic stuff Mr Z!

[@quick65filly]

JZ - My remaining jet turbine question: The low pressure turbine shaft and high pressure shaft. I assume the HP spins on the LP? Never seen this good visually.

[@AgentJayZ]

There are some designs that use a bearing between the LP shaft and the HP. Otherwise, "spinning on the LP" can mean anything you want. Question rejected for vagueness. Also, what does "never seen this good visually" even mean? Please watch the MADTV episode "vague"

[@serpico1616]

Been waiting for this

[@Geomanb]

a blast from the past

[@joeharvey268]

The Norwegian cf104 will be ready for a run i guess :)

[@micstonemic696stone]

next to Jet Wash alley, behind Jet Rock alley, you could have been really hurt, we don't want that, was that a GE J79 and being AB Reheat maybe a flight engine ? thanks for your time, when you could have been in the Pub, like us your do like testing time especially AB, You do handle the cold very well and then an AB Roast, respect seeing you at work at -35c, in England we cannot operate anywhere near, hell we won't even get out of bed, Mic Stone so appreciate all your education love the Turbo-Jet-Shaft-Prop thanks, England

[@AgentJayZ]

Yes, this engine flies in an F-21 Kfir as a trainer.

[@micstonemic696stone]

@@AgentJayZ I was unaware of the Kfir fighter believing it was a French Mirage type That's a massive turbo-jet for what looks like a lightweight aircraft canard look new What I find interesting about Israel is the got first dogfight kills with the F-15 & F-16 and lead the way with drone technology, Thank you for the time you give us in all things Jet-Tech I have found the right man to educate me and I'm sure other's In a way that over time, I have understood, even a reply To assist with clarity, I am proud of all learned, though others Don't share my interest, but thats OK why would they I cannot fly but grew up with WHY ? Always Jets first And a healthy interest in propulsion Always a student, you are unique AgentJayZ ☺

[@landrus]

It's interesting that you can't really tell from the noise if its full military or afterburner. Could you feel any difference in air flow at your distance?

[@AgentJayZ]

The actial exhaust jet didn't even make it half way to me. You can see it as the distorted visuals of a heated stream of rising air.

[@zapfanzapfan]

Good experiment to test safety distance. Did one of the guys in the test cell manually engage something for the afterburner? I'm sure he didn't but it looked like he tapped a loose connection or something and then it lit.

[@AgentJayZ]

It's actually a switch that i am not familiar with. I have texted Justin about the question.

[@lorditsprobingtime6668]

Awesome 😁, even on here I got a pretty good feel for the POWER of that thing. And no, I doubt that real power rumble would come through properly, probably not without a more specialized microphone or something. I'm listening through a Logitech 5.1 sound system and even with that it doesn't seem to be coming through. I have been close enough to and behind a fighter jet and close to when given power to takeoff and think I know what you mean though. That is really impressive live and from where you were would be VERY impressive. Amazing what we can do with a bit of old Dinosaur drippings and some modern metallurgy and technology, thank you👍.

[@welltell.]

Hello AgentJayZ, another youtuber i watch called PaddyPatrone uses a double shotgun mike to record fighter jets at air shows and his sound quality is most excellent. Maybe you can ask him about his setup, so you can use it on your jet engines and get the real proper sound of a roaring jet engine.

[@AgentJayZ]

It's a good idea, but did you notice how far away I had to be for this video. I can either get decent sound, or good video. What I really need is a wireless shotgun mic that will transmit more than 100 ft or so. Also, it needs to be remote controlled. This 13 minute video took several hours of recording that was edited down.

[@seal010101]

I enjoy. Is that an actual shipping container built into the shed? Or maybe just the door of one? Just the door is cool. A whole container would be super cool.

[@cmsch180]

It is the whole container! thats the "control center"

[@Mrsournotes]

Another Conex put to good use.

[@obsoleteprofessor2034]

Candada...where's the snow?

[@damny0utoobe]

Thanks Agent JayZ. I always wondered how it looked/sounded from a distance. This video really highlights the power density of jet engines. So far away but you can still feel the power. The guys that are close to the engine during afterburner, what are they observing?

[@AgentJayZ]

I think they are looking for leaks at the 92 connections between the AB fuel manifolds feeding the spraybars.

[@davidclodfelter7147]

Could you feel the heat?

[@AgentJayZ]

Not at that distance.

[@jamesmason2228]

The first time I heard a jet really run-up was a fighter jet on the ground at "family day" at NASA Lewis (now Glenn/Lewis) in Cleveland. I would have been about 6 (so, maybe 1966). The striking thing to me at the time - I was within inches of my parents but I absolutely could not hear them speaking AT ALL. Neither could I make myself heard. Just beyond deafening. Could have been a Sabre - but not sure. I think they were working on something to try to make jets less noisy - but I don't quite remember otherwise what the point might have been.

[@Vortices27]

Glorious!

[@philipcollura2669]

Simultaneously very hot and very cool.

[@tommy13t]

Would jet wash ally be better built if it were paved or would that cause more problems?

[@AgentJayZ]

It was not built. It was eroded into the ground by jet exhaust. Our new stand is lower to the ground, so the erosion is happening more quickly. Unexpected consequences.

[@DT-ge8gd]

Is it just me, or when you were right behind it @ 4:40, at full power, the grass right in front was not even moving...(relative to the jet wash) but the grass of to the right was blowing in the jet wash... Why...? I thought for sure you would get some wind where you were standing... but nothing !! I note it was a windy day and the wind sock was heavily blowing 90 degrees to the right of the line of jet wash... but surely not enough to push away ALL the jet wash of gases travelling at speeds in excess of ~200km/h?

[@AgentJayZ]

The wind can deflect the jet stream, and I think the energy dissipates in a third power relationship with distance. Maybe fourth power? Need a physicist or an engineer here. I was much farther back than I needed to be for the exhaust gases. I was worried about rocks.

[@DT-ge8gd]

@@AgentJayZ wow. Cool. Thanks for the explanation!! Love the channel... keep up the good work !!

[@AxelC2020]

I know it is a bad idea to stay in front of the air intake, especially if the engine is running at max power. Do you have any OSHA like guidelines like at what distance you should be away from the engine, related to your position relative to the intake? In other words: there was a tech staying to the side of the engine when running at full power. I understand it is safer than staying in front, but are there any official guidelines?

[@AgentJayZ]

Each engine has its own safety distances.Many of the aircraft manuals have minimum safe distance charts. Nobody ever needs to get near the inlet, except to look for ice formation. Whatever the actual minmum safe distance is, we at least double it.

[@obsoleteprofessor2034]

Is the low/no smoke from a mod you made?

[@AgentJayZ]

It's a factory upgrade implemented in the 1970s, I think. There were nearly 20 thousand J79s made from the 50s through to the 80s

[@SirDeanosity]

Afterburner pulls. LOL!

[@LeDabe]

Nice shoots!

[@tommy13t]

Also would love to see a Birds Eye view of jet wash ally being used. I figured your near an airport so drones are possibly out of the question but maybe a roof mounted camera facing back? Love your videos all the way from Charleston SC.

[@AgentJayZ]

Tommy, this is considered a complaint. If you don't like what you see here...

[@TumbleTrashOfficial]

@@AgentJayZ how is asking for a birds eye view a complaint?...

[@thomasaltruda]

I assume you are running it on Jet fuel, or kerosene or diesel, right? Aren’t there times that you test run the engines on propane or natural gas? What dictates the fuel that you’ll run it on in the test cell? Can he afterburner light on other fuels too? And why do you think the initial AB pulls didn’t light off? Seemed to light just fine after the first ones.

[@AgentJayZ]

The aviation engines are built to run on liquid fuel, so we have equipment to feed them Jet-A, which we get delivered from the airport next door. Industrial engines are almost always built to run on natural gas. We run those on propane, because a big tank of liquid propane (also delivered by truck) and a vaporizer system is much more economical than having a natural gas pipeline built to our test stand. Gaseous propane is a near perfect substitute for natural gas, when considered as a fuel for any combustion engine.

[@18robsmith]

-4C - a nice warm day then ;-)

[@susbox5554]

That’s the average Kansas temperature in the winter time lol

[@BB..........]

The famous engine Art Arfons got his hands on, that he wasn't supposed to have. :D

[@RayeBay1]

Heavens to murgatroyd! @12:27 Double ear protection, plus their hands, even!

[@raygale4198]

And if you accidentally sneeze and open your mouth it's deafening, the sound transfers via your palate into your inner ear.

[@AgentJayZ]

Snagglepuss! I have never heard anybody use that word in my whole life. I did when I was in grade school, and nobody got it. I am impressed, sir. Of course, nothing in life is perfect... I spell it in my mind Murgatroid. But dang, am still mightily impressed. Cheers!

[@exiledintheus7251]

What is that? And how likely is it to get super heated and fly off and burn someone? Sorry I need to know to help my guys remember safety protocols.

[@AgentJayZ]

1) It's a J79. 2) What do you mean when you say "it"? 3) Your guys do not need to remember safety protocols for a jet engine test cell ... Unless they do, in which case you are in trouble if they don't already.

[@exiledintheus7251]

@@AgentJayZ I'm looking to prove or disprove to the staff from someone who has the more experience around operating jet engines. Do you test worn j79s? Is there ever a fuel leak or something else that may cause it to be more hazardous? We're working with Pratt and Whitney JT 9Ds

[@AgentJayZ]

Interesting. May I ask what you mean by "worn". Every engine I have ever seen has been "experienced" I have never seen a "new" engine in my life. But of course if you work in the biz, you would know that overhauled and new are both lumped into the category of Serviceable. "worn"? everything has wear, and every piece has allowable limits for wear before it becomes unserviceable, and needs either repair or replacement. I have only ever tested "worn" engines my entire life.

[@exiledintheus7251]

@@AgentJayZ thanks funny joke 🤣 also the people who sold you the camera have been waiting to sensationalize your Michael Bay production of a jet test cell

[@AgentJayZ]

I was definitely not joking.

[@brushitoff503]

Where's the KA-BOOM? There's supposed to be an Earth Shattering KA-BOOM! Exit, Stage Left ha ha! Love it. Great video

[@AgentJayZ]

The Earth? Oh, the Earth will be gone, in just a few seconds...

[@deani2431]

Have more balls then I standing next to it without any shielding should it come apart.

[@AgentJayZ]

This is actually a demo run after the first test run, so no worries. These engines come apart less often than Honda Civics.

[@steveg2294]

Is that my boy j detta ❤

[@AgentJayZ]

Your eyes are too good. Please report for a retinal scraping...

[@thomaswilson8634]

Now guys don't yall know dat a barn cant fly even with a military afterburnering engine.

[@sheep1ewe]

Not proven until properly tested...

[@lorditsprobingtime6668]

@@sheep1ewe It will happen! Agent JayZ will keep trying till it does!

[@johnbonham5951]

Ever work on a flight deck

[@AgentJayZ]

Not technically. Since the space station is in a vacuum, it's not actually "flying".

[@lorditsprobingtime6668]

@@AgentJayZ Eh what? Did you actually work on the ISS, or part of it? I wouldn't have thought so but, that suggests you have, also that you were in space doing it? You've piqued my curiosity with that comment. Maybe I misunderstood a reference though.

[@rickrudd]

Who's this Celsius chick you referenced? Sounds Polynesian

[@zapfanzapfan]

The average American has difficulty telling Sweden from Switzerland... Polynesia was a new level...

[@rickrudd]

@@zapfanzapfan I'm from Almaty, Kazakhstan. Anyway, was he talking about Cynthia Celcius or Jamal Jenkins Celsius?

[@zapfanzapfan]

@@rickrudd Anders Celsius, Swedish scientist and inventor of the Celsius temperature scale.

[@rickrudd]

@@zapfanzapfan No way in Hades. That's definitely Kojenwa Celsius from Senegal.

[@AgentJayZ]

I have intervened to keep us all civilized and at least pretending to be happy. Cheers!

[@1.6Kilometres]

B a z i n g a !

[@davidjohnson1134]

Why do they not use ram air for engine testing wouldn't it be desirable to put the engine to its max potential during testing after overhaul

[@AgentJayZ]

Because ram air is short for ram recovery air, and it is a result of the aircraft moving through the air as it flies. Do I need to continue, or do I need to point out the structural steel mounts that are literally bolted to the one meter thick concrete floor ? Also, probably for reasons described above, all aviation engines are rated for thrust while bolted to a test stand.. That's why you see the term "static thrust" used. "max potential" is a meaningless term. The proper term is maximum performance, which is determined through static testing, and what you see in this video.

[@lorditsprobingtime6668]

@@AgentJayZ: " Do I need to continue, or do I need to point out the structural steel mounts that are literally bolted to the one meter thick concrete floor ? " Holy f***! I wondered about how securely you anchored these down. To be honest I was thinking chains to very solid anchor points in front somewhere but, that's massively thick concrete you're bolted down to. Now I see why I haven't been noticing as much as I would have expected out front. That was very impressive, thank you.

[@AgentJayZ]

Have a look at an old vid about our previous test stand. It's called "the engine test stand".

[@lorditsprobingtime6668]

@@AgentJayZ OKay, a slab of concrete a meter thick and 8 pillars driven 16 feet into the ground. I read somewhere that the rotation of the earth was ever so slightly slowing till some time ago when it ever so slightly started speeding up again, now I know why! You'd change the spin of the planet before you moved that lol. And you were right then as now, "everybody DOES love an afterburner" 😁. I only just noticed, you have an Ozzy flag up on your wall but it's the smallest flag there. The Canadian and American flags look the same size while the Brits are clearly showing off with their big one but, us poor little Ozzies have (from what I remember seeing) the tiniest one there. During WW2 my father flew with a Canadian crew in a Lancaster out of England, the last time he ever heard a Lancaster fire up was in Canada at a memorial thing he went to to meet up with his old crew where they brought out what was then, I think still is the only Lancaster still flying. He went over with the guy who'd become his best mate, a Dutchman who also flew in them and as they were getting out of the car they heard those engines start firing up, both immediately recognized the sound and took off running to see it. That was a great time for both of them, so many never made it home doing that extremely dangerous job, they were a couple of the very lucky ones. Dad's brother was a pilot too, flying elsewhere in a different aircraft and didn't make it home.

[@grahamj9101]

@@lorditsprobingtime6668 Canadian Lancaster VeRA is one of two airworthy Lancasters. The other, PA474, is part of the RAF's Battle of Britain Memorial Flight. I saw it flying most recently at the Bournemouth Air Show on 2 September. I saw both flying together, back in 2014, when VeRA flew over to the UK, to do a tour together with PA474. The sight -and sound - was unforgettable. There might be a third airworthy Lancaster in a few years' time. NX611 'Just Jane' is being restored at the Lincolnshire Aviation Heritage Centre. I just hope that I last long enough to see two Lancs in the air together once more.

[@Wlodek1410]

Thumb up👍🏼

[@caseyjrthehybridengine3444]

Oh nicely done there with the monstrosity

[@gregknipe8772]

meh....

[@AgentJayZ]

Oi!

[@camojoe83]

"...there will be rocks..." You have my attention. I wonder how far it would throw a baseball of you toss it in the wash about 10 feet back...

[@weefek]

love this, brother