J79 Smoke, Howl & Burn No Talk

[@tatdexter2334]

The J79 howl never failed to send chills up my back when I'd hear the German Luftwaffe F-104s taxi out at Luke AFB in the '70s. Yes, even when it was over 100°F (40°C)! It's great to see a small part of the effort that goes into maintaining equipment like this. Thanks for taking the time to put together the various educational and “watch it work” vids.

[@skeptical2649]

After USAF tech school my first assignment, in 1966, was Nellis. I had never been around fighter jets, and my first experience was 4 F-4's overhead in landing break. That howling sound was unworldly to me at that time! The smoke and smell of JP4 was intoxicating too! Seeing QF-4's with newer J79's years later in airshows was cool, but no howling or smoke was disappointing.

[@weofnjieofing]

Love the smoke and howl! seeing one of these in an F104 is sensational. No need for upgraded burner cans, just light up the afterburner for clean, guilt free emissions!

[@survantjames]

Seeing this in person must be a quasi-religious experience. Thanks for sharing.

[@jamesshepard1606]

Almost everything I know about turbine's is because of you Sir, from C 130s to a Saber jet...Sir Thank you for all the KNOWLEDGE you have given me. I hope to meet you in person someday...

[@TheInvisibleOrange26]

1:55 you can really feel that BOOM when the burner ignites.

[@alpharomeo15]

I remember hearing these engines @ our house as a teenager in the 60's... we were several miles from the USAF base... when the wind was blowing just right they sounded like they were in our neighborhood! ☺️ One of UR best videos so far... keep'em coming! 👏🏽👍🏼☺️

[@AgentJayZ]

You know I have a pretty extensive back catalog of J79 afterburner tests, eh?

[@AdamosDad]

Was a little worried for the dragon fly. What a terrific engine, with a huge history.

[@phantom1298]

Chills and goosebumps. Reminds me of my younger days in southwestern Germany where we had our Luftwaffe and NATO allies fly the 104s and F-4C/Ds. Good times with way less airspace/altitude/airspeed restrictions. Some treetop action was always highly appreciated.

[@sionekulu7912]

Ooh ok thanks J , I m a Big Big fan of your videos and the more I watch your videos the more I understanding about Turbine Engine and how its works , your videos are base in the basic knowledge and understandings of turbine engines in general and its covered alots of knowledge about jet engine which its very useful to a poor guy like myself , I now understanding more about jet engine better than ever before , and I feel very happy , some of your videos covered jet engine in more details about different engine components , I watched with my note book write and draw pictures and diagrams to make it penetrate deep in to my head and never loose anything , amazing I m so proud of myself understanding something I never dreams of , something I thought its hard to study about but when I first meet your videos straight away its changed the way I see at Jet Engine , last thing I remembered lately you comment about " Pressure and Suction " I believe in the word PRESSURE in any Industry what so ever Buildings and constructions Industry , Medical and Hospital Industry , Shipyard and Engineers Industry and so , everyone using the word pressure , I never see anyone using the word suction , and even ourselves for instance , if I drink a cup of soft drink with a straw or without a straw Im using the air I breath to pressured the drink through to the stomach and many other industries which they used the word pressure , we dont use this word suction , sorry for my notice which too long apologised for that , even plumper or electrician can always used this terminology PRESSURE for electrons travel through thick cables and thin cables etc so thanks for everything mate cheers

[@jim5870]

Cool! Thanks! Wish I could go to Jet City and watch a test run in person, that would be awesome.

[@AgentJayZ]

In this world, anything is possible.

[@HuntersMoon78]

That howl is cool and at the same time sounds haunting.

[@pauldietrich6790]

Sweet. We had the F-4C for a few years when I joined the Guard. They were the smoky ones...lol! But on a close low break they'd howl like a banshee as they had blown slats to help with the slow speed / AOA flight regime. Scare the heck out of you if you didn't know...and sometimes when you did know... right over your head!

[@nmccw3245]

As an Air Force Brat who grew up on TAC bases, this brings back very fond memories.

[@micstonemic696stone]

cannot tire of the J-79 in Reheat thanks

[@reab8286]

The Ultimate BBQ Appliance, When you have the Inlaws Over. Long Live The J79 MMM Jet Porn!

[@Zeroniner3]

I think its the early versions from starfighters,anothertime stunning shots big thanks from Greece!!

[@bruce2225]

OMG...the Power comes thru thank u! 90 gallons per Minute is mind boggling!

[@patrickdouglas3498]

so friggin beautiful. thank you! #dreamlife

[@welltell.]

This is totally ASMR for jet fans.....

[@AgentJayZ]

That was the intention...

[@donaldstanfield8862]

I would NOT want to hear that coming after me! It's like a built-in air-raid siren! Chilling! Stay safe, everyone!

[@AgentJayZ]

If a Starfighter is coming for you, it's likely out running the sound it makes...

[@AxlMetcalf]

That dragonfly is gangster 🤣

[@williamb.9110]

Mankind sure has come a long way from rubbing two sticks together to cook his dinner

[@andycoppes]

And this thing qualifies for senior discounts at the drive thru

[@sebastianbraun7073]

Great Video and I like the Sound very much.

[@SuperMcmoo]

Hi JayZ Is this the engine out of the Norwegian Starfighter LN-STF tailnumber 104637? I know they shipped the engine out a while back.

[@kennethsalomonsen6244]

I think so, they sent it to the same town. And it's not that many flying straighter with that original howling sound. Vestfjordoksen lever snart igjen :)

[@jonpardue]

The afterburner appears to have a "full fuel flow" setting and a lesser fuel setting. Wondering if the afterburner is on/off or adjustable? Thank you for taking time to make videos, this is great!

[@AgentJayZ]

AB is fully progressive from min to max. A big improvement over the earlier "all or nothing" designs.

[@RockyAllenLane]

The ABs on the J79s used in the CF-104s at Cold Lake were 2-stage. When the pilot pushed the throttle to full AB, you got a 2-stage kick in the ass.

[@robertboykin1828]

It is 4 stage.

[@AgentJayZ]

These have four individual spray bar manifolds, each set to "crack open" at a different pressure. But the total fuel flow to the afterburner is smoothly progressive from min to max, with no real steps.

[@jonpardue]

The controller on this engine does an amazing job balancing several tasks at once. Curious now, have to study how it works, thank you @AgentJayZ

[@dominicsavioribera8426]

All those flies (that dragon fly was particularly keen) wanna update themselves with jets!

[@stubi1103]

Great pictures, love it but what is the fuel consumption per hour at full load with afterburner please ? I'm afraid the fuel pump has a big delivery rate.

[@AgentJayZ]

I just added that info to the description, because A lot of people are asking the same question.

[@stubi1103]

@@AgentJayZ Thank you very much !

[@SkinnyBiker]

Brings back memories of Desert Shield, Desert Storm allied F104, F4 fighters screaming overhead.

[@jeremymurphy7320]

I can't be the only one who was ready to see the dragon fly at :15 get blown into a low Earth orbit...

[@majobis]

An afternoon afterburner cookout. I did not know you could partially close the nozzle in the afterburner while it is lit off I always thought the nozzle had to remain fully open.

[@jbrauertn]

Most prop planes are designed to keep the prop tips at sub sonic speeds in order maintain efficiency. Doing some quick calculations based upon my estimate of compressor diameters and rotational speed like in the Jet boat project it seems that the compressor blade tips may become supersonic. Is this true? Even though it’s obviously considered during a turbine engine design, does the efficiency of the compressor section suffer as a result? Does the fact that the compressor is enclosed keep the tips sub sonic? Love your videos and thanks for sharing your knowledge!!!

[@AgentJayZ]

I just measured it. The radius of the tips of the first stage blades is 15 inches. So, using 2(pi)r(rpm)/12(60)= fps Max rpm is 7685. So 1006 fps Mach 1 at sea level? Wiki says 1100 fps. I would expect designers of a military fighter jet engine to push the limits... Either way, subsonic at max revs...

[@shaunwest3612]

Amazing agent Jay z, epic sound OMG 😀👍👌

[@tomshelton435]

Very very cool machine.

[@cornfilledscreamer614]

So Jay, out of curiosity, what is the loudest engine y'all have had to work with so far? I'd imagine this one was fairly high on the list, but just wondering. Thanks for the videos, man!

[@AgentJayZ]

The afterburner adds a lot of decibels, and this is the only AB equipped engine we test. Without AB, the Avon, Spey, and Olympus are all louder than the J79.

[@cornfilledscreamer614]

@@AgentJayZ Very cool. I can't even imagine how loud those things are up that close. Has to be a rush!

[@robertboykin1828]

Try a t-37

[@skeptical2649]

I was at Nellis with F-4's, 105's and 100's. No contest, the F-105's with J-75's and explosive afterburners were the loudest among those 3 fighters.

[@iancurran6041]

Hi JayZ please could you tell me if (in your opinion) it is safe doing what I am doing I own a RR Avon I could never afford to get it a safety run up so it will probs never be live run but the local kids like to come round and watch me spool it up to about 2000rpm they will probably never get chance to get close to such a machine she has oil and the pumps seem to be doing their job no blade rattles or anything like that.

[@AgentJayZ]

2000 rpm for an Avon is above starting rpm. If you can get it up to that speed, you only need a few things: A sturdy frame to hold on to it, some electric power to the igniter box, a way of measuring EGT, some fuel, and a cable to operate the throttle. All of those things are covered in my vids... Even at idle, you'll terrify all of your neighbors!

[@dremwolf5419]

Only things that would make this video better would be if the run was done at dusk and if you could smell the exhaust!

[@robertboykin1828]

I used to stand behind them on a cold winter day. That kero stinks.

[@dremwolf5419]

@@robertboykin1828 I loved the aroma of JP4. Unless I was drenched in it.

[@leodikinis7390]

Nice!!

[@dhawald3]

Why do Jet engine actuators like VSV, IGV are operated by fuel pressure and not pressure from the hydraulic system?

[@AgentJayZ]

The engine does not have a hydraulic system. There are drives on the gearbox for hydraulic pumps used by the aircraft hydraulic system. The engine and the aircraft are totally separate. Somebody designing stuff way back when decided that a critical function of the engine should not share its mechanism of operation with the aircraft hydraulic system. I agree with that decision.

[@MicrophonicFool]

Even for this run-up, feels like an expensive day for Kerosene sales

[@ch0cchip704]

That's a can of violent energy!

[@wallaceshackleton1889]

Nothing quite like a bit of Starfighter porn. Takes me way back.

[@easydoz1]

Bravo! Cobweb and mosquito removal at spare no expense pricing.

[@GeofreySanders]

Cobwebs, dust, ceiling tiles, entire ceilings, floor tiles... you name it, we'll blow it away!

[@easydoz1]

@@GeofreySanders Lol. Sand blasting. Building humidity removal. Water damage restoration. Tornado structure testing. Wartime bunker clearing. And many more...

[@hackbyte]

'Turbojet Engine ASMR' *Eg* ;)

[@0000SYL]

any idea what the certified noise level is in dB?

[@AgentJayZ]

At idle and 50 yds, it maxes out a 130dB meter. At full dry power, my guess is above 150. With double ear protection, and your hands holding the earcups against your head, when the afterburner lights, it nearly knocks you back. My guess is 170 plus. I realize it's a logarithmic scale.

[@AgentJayZ]

If you are concerned about noise, then no jet engine will be suitable. The J33 is the oldest, least powerful and probably least noisy of the list, but will be a shrieking monster. A Nene is roughly equivalent to a five thousand Hp piston engine, and may be quite interesting. A museum is a place for a demo run, when you know the engine is reliable and will not have a disastrous and dangerous failure. A test run is risky, and should be done at a test facility. I suggest you visit a test facility, and become familiar with what's involved, but it sounds like quite the project. I wish you luck and success.

[@0000SYL]

@@AgentJayZ I told them to instead buy a small micro jet engine, place it in a see through safety structure and let vistors interact with it (supervised ). They liked that suggestion. Actually the J33 we have is rated at 20 kN and is more powerful than Nene, Derwent, Marbore II. In any case i think it will be one with centrifugal compressor as it simple and less blades that can result in uncontained failure. Thanks again!

[@dhuber78]

Love a J79. I do have a question. What causes the howling? Is it from the engine or is from your test cell’s intake cone? I guess similar to howl from the Vulcan bomber that was due to it’s intake ducts if I am not mistaken.

[@AgentJayZ]

The short segment exhaust nozzle, as explained in the video. Later versions of the J79 have longer segments in the variable jet nozzle, and they don't howl.

[@Zodliness]

@AgentJayZ I'm not gonna pay for that run either! 🤣 How much fuel does the J79 consume during a typical twenty minute run at full open throttle? ✈

[@AgentJayZ]

Full afterburner uses 87 gallons per minute. Per engine.

[@ShadowOppsRC]

Did not know the actual amount but knew it was a lot!

[@Zodliness]

@@ShadowOppsRC I asked because a while back someone said to Jay in a video that jet engines run on air not fuel. He offered them to pay for the test run air, but they declined.

[@Zodliness]

@@AgentJayZ I'm amazed that burning through that much fuel could ever be considered a 'fuel efficient' production of thrust.

[@AgentJayZ]

Nobody has ever called an afterburner a fuel efficient way of producing thrust...'cept maybe a rocket engine designer...

[@lordred7462]

does turbojets or turbofans need warm up and cool down time before taking full power and shut down? I know jets are hottest when you introduce fuel to them during startup but what's with external gearboxes fluids, oil and bearings?

[@AgentJayZ]

20 sec warmup, 2 minute cooldown recommended. Check out my vid: Cool Your Jets

[@stewarttyler6445]

A proper jet engine. Love the howl. Back in the days when pilots flew planes not like now aided with electronics and computers.

[@DeltaV2TLI]

Jay do you have any thermal constraints to running the engine on a test stand that wouldn't be there if the engine in an actual aircraft moving thru the air? Maybe duration at AB or full military?

[@AgentJayZ]

With the J79, no. The Orenda is limited to 5 minutes takeoff power on static, and ten minutes in an aircraft. With modern jets, fuel is your limiting factor, so keep the tanker in range!

[@rabidbigdog]

I hope these engine has the nickname 'Sooty'.

[@johnmelling9950]

Jay, i keep seeing the video of events unfolding in Afghanistan with people all around the huge military plane whilst its moving on the runway with the engines running. How is it they are not sucked into those huge turbofan engines, even people stood directly under the front and rear of the engines seem unaffected

[@AgentJayZ]

Inlet danger depends exponentially on power level. Those engines are at idle.

[@johnmelling9950]

@@AgentJayZ I see. I was always under the impression that its very dangerous to go near the inlet of a running turbofan at any speed. I guess you learn something new every day on here. Thanks for the reply. Your new videos have stopped appearing on my home page btw and ive no idea why as im still subscribed.

[@zigwil153]

In regards to noise, any restrictions on when you can test?

[@gyzfr6]

Could it be modified to run on something else than Jet B or whatever ?

[@AgentJayZ]

No mods needed to run on any low viscosity flammable liquid. With adjustments to the fuel control, it'll work well on ethanol, methanol, kerosene, gasoline, diesel, lamp oil, home heating fuel, any aviation fuel. Different fuel system required, but the core will also run on hydrogen, natural gas methane, propane, anhydrous ammonia, or even acetylene. Hmm, that last one might be a bit of a worry.

[@HiveQu33n]

@@AgentJayZthats really cool. Are most jet engines like that? Or is this a unique quirk of the J79?

[@Artisan322]

Good weed killer

[@leadsolo2751]

12:05 _ The Sight of Freedom

[@sionekulu7912]

G day J hows things ? That test amazing eh , we can tell how powerful of the thrust force are eh , maan amazing jobs by the boys . Quick question , does the engine loud sounds affect and impacted on your neighbours ? May be things work out normally with the rest of the neihgbourhoods , thanks for sharing cheers

[@AgentJayZ]

Our nearest neighbor is the airport control tower, at over 1000m. When testing, we use sonic dispersion mechanisms to rapidly attenuate the destructive sound pressure levels. Everything is fine. Nothing to see here. Nothing to hear here...

[@sminton85]

Sonic dispersion mechanisms... Trees? Lol

[@GeofreySanders]

@@sminton85 Cellulose-based, organically and locally sourced, dispersion mechanisms.

[@sminton85]

Hilarious!!!

[@jimbailey1731]

Dear Agent JayZ, on April 18 1969 a B-58 bomber crashed near my home in Illinois. I was it as a kid and searched many years to find it again after realizing the magnitude of what it was. I had 4 ……I say four, J-79 turbo jet engines on the great aircraft. I have looked all over to find how many stator fins and how many turbine fins would each engine have. I have only found 8 turbine fins from the hot section (I believe) and some small engine parts. How many should be out there looking for a new home ? The ones I have look new except for being bent to hell. Any help would be great.

[@AgentJayZ]

There are no parts in the J79 that the manufacturer calls fins. The moving airfoils are called blades, and the stationary airfoils are called stators. A lot of times the turbine inlet stators are called nozzles. The J79 has over a thousand compressor blades and a similar number of compressor stators. The turbine has several hundred blades and several hundred nozzle airfoils. I've shown all these pieces in several videos. Probably the best one to watch would be my tour of our J79 cutaway: it's called J79 - Turbine Engines: A Closer Look.

[@Zaaap-z5t]

I’m really confused. This video says 2 minutes ago. What? Also, what is your job like?

[@perseus068]

Wonderful! Is that the GE-11A version right?

[@AgentJayZ]

It just says -11 on the data tag.

[@obsoleteprofessor2034]

Maybe the smoking will stop once the rings get seated.

[@ShadowOppsRC]

Lol!

[@easydoz1]

Lol Only Suck Squeeze Blow then occasionally some Reheat...

[@andycoppes]

Every time i see this i cant help but imagine the need to run up and slap someone as fast as you can- because inspiration lies somewhere in that scenario.

[@kearneyboy]

👌

[@magoid]

The J79 is the most powerful engine you guys had work with, or there is another bigger and more powerful?

[@AgentJayZ]

Olympus, LM2500, Iroquois.

[@robertboykin1828]

I think it's the J-75.

[@AgentJayZ]

We have never had a J-75 in the shop. Would like to...

[@danawick9817]

@@AgentJayZ speaking of the iroquois is there any headway with that

[@easternwoods4378]

And a tank truck just out of the frame

[@ayuse01]

Nice! How many gallons of jet fuel was burned for this awesome spectacle?

[@AgentJayZ]

description

[@ayuse01]

@@AgentJayZ sorry m8 didn't noticed. Crazy numbers!! More than one hot water tank full of jet fuel a minute!!!! What a gas guzzler! Oh and while you're here, what is the orange glow at the bottom of the exhaust at 16:46?

[@robc3056]

Is making a bad video even in your vocabulary J Superb....As always ..Thats gotta be the longest burner run youve showed us aswell ?? and thats one hell of a way to do the weeding in the garden !

[@_Max_Headroom_]

Greta Thunberg's Nightmare :-D :-D The howling is....absolutely phantastic..... *Avro Vulcan* memorial..

[@AgentJayZ]

Vulcan roar was from the inlets built into the wings. This is a Starfighter tribute. Similar sound though, eh?

[@besday1]

Little bit assistance if possible, any colleague that can provide me with the number of blades for the (IGV, 1st Rotor and 1st Stator) for the J79-GE-17 Engine.

[@AgentJayZ]

Why that particular engine, and why does the number matter, for only the first stage and IGVs?

[@besday1]

@@AgentJayZ as I said in another reply, I make a study on the compressor of the J79-GE-17 type. And I don't have the manual nor able to have it. I want any version of J79-17 either -A or any other type but should have 17 compressor stage. If could be possible count them and pass it to me. I see the video of the close look to J79 and I barely counted the IGV 20 blades but i am not sure, and still need the number of 1st. Stage bother (rotor and stator). Thanks @AgentJayZ

[@besday1]

@@AgentJayZ any help for me. Any J79 engine type that have 17 stage.

[@deathk26]

She's a screamer!

[@Nighthawke70]

You know what would be cool (or hot), is employing a IR camera and recording the heat coming off the engines. Oh course, the price tag on a good FLIR is a stinker...

[@AgentJayZ]

I believe I literally did just that. In the accompanying (previous) video. My hand held IR camera does not record, but I put it in front of my camera for a couple AB shots.

[@Nighthawke70]

@@AgentJayZ Oh, nice. There's a nice add on camera line that can be had for about 500. I wonder if it could be sold to you Canadians. They are named Seek Thermal. They are the ones that keep FLIR up at night and forcing pricing wars on their NICE stuff. I had one of these and they are VERY good at what they do. Sadly, when I upgraded my phone that had the USB-C plug, I could not get the imager to work with any adapter I could get my paws on.

[@greghelms4458]

Only thing wrong with this is no witty AgentJayZisms

[@18robsmith]

The J79 has silenced Agent J-Z :-) If a small, quiet, engine can do that I can't help but thinking what would an Olympus 593 do?

[@mikehanks1399]

If I wanted? Of course I do. Duh.

[@keithglaysher9201]

Frie4d & blasted dragonflies anyone?

[@GeofreySanders]

They've already got a much larger dragon, that flies. Those insects are just posers.

[@RaidifyLifts]

why does it sound like a vacuum cleaner

[@AgentJayZ]

I don't think it does.

[@Andrew-13579]

Because they are related. One is like 1 hp, this one is like 10,000 hp. 😄. When I was a teen, I connected the old Hoover upright vacuum to a variac so I could vary the RPM to sound like a jet engine. …until my dad said that’s probably not good for a motor with AC windings to be given variable voltage. It was a 1-stage, centrifugal-flow, electric motor-driven compressor. I’ve noticed how the output of a vacuum cleaner is warm air. Its not the heat from the motor’s windings making it warm. I would say it’s from compression, but the air is free blowing, no longer compressed. Maybe it’s due to friction?

[@mgandhi785]

Oh my... Tinnitus anyone?

[@AgentJayZ]

You're so witty and superior, that your condescension isn't even annoying.

[@Andrew-13579]

What? What? I’d assume all involved used proper hearing protection. And animals probably instinctively applied the inverse square law. 😀 I walked up to a police Jet Ranger helicopter, once, while it was idling. (Pilot wanted to show me the new helo with FLIR). Man!!! That’s what I call ear-piercing!! Pretty quickly pressed my fingers to my ears to block the noise. I heard temporary tinnitus after that one, though. It gets loud real fast as you approach…inverse square law!