Відео

The engine had a dream flashback from a cartoon

Szacunek Szanowny Panie za cierpliwosc i upor. Taka ilosc zaluzji do wyregulowania to mega trudny i czasochlonny temat. Pozdrawiam👍🏻

The HPT blades on the Rolls-Royce Trent 1000 TEN have a life of 1000 cycles (flights) mandated by EASA (if they last that long before cracking due to creep) and cost around $25,000 USD each

hello, can you send a greeting to bocho please, I would appreciate it very much.

Still here at 2024 dude

Im gona be a master of an turbo jet engine within my friend circle 😅

Hey young man😊..you describe things very well😅..

Hi JayZ, can you plz do a video on Hydromechanical fuel unit which would be more understandable in your version 😅

Seem to remember early B52's and F4's smoking black..........Even the F4's suffering in Vietnam 4 being too visible...

Agentjayz i cannot believe people do not believe you when you work on and build jet engines and have to use fuel to make them run!! I have a shop neighbor that builds flat head ford engines and he thinks jet fuel is a hoax. Hes only flown in a jet twice in his life!! I told him that gas for his engines was a hoax and he needs to stop paying for the water he pretends to run his engines with!! People are soo ignorant when they have never been around or build these jet engines!! Keep up spreading facts!!!

That’s very interesting how the bell mouth makes up for the air’s angle change up to 98%

Remember my days in Cold Lake as a tech on CF-5's. J85 a great little engine but for some reason was prone to compressor stalls when fitted to this bird. Good thing it had 2 because it seemed like there wasn't a day went by without a 'bell' alarm as a result of a pilot calling in a stall on an engine. Double stalls were very rare & most of the time the pilots were able to get relights, so few crashes as a result. It was a busy time with many prospective fighter pilots from various NATO countries besides our own in their last phase of training to be full-fledged fighter jocks. So in the end it was probably a combination of engine inlet design of the aircraft along with hot shot rookies diddling with throttle position during various flight envelopes that caused so many stalls. The Tutors flown by the Snowbirds rarely suffer compressor stalls, same engine without afterburner..... Kind of makes one wonder about an engine being fine tuned on a stand in a test cell vs being installed in an aircraft with different intake geometries.... Not generally a thing with airliners as they mostly hang from the wings without lengthy intake tunnels.

J79 is a beast. You don't just hear it, you feel it when close enough. I did 6 months line servicing with 439 Sqn on CF-104 in Germany back in the early '80's. Being a rookie I was 'back end' man when we started the aircraft. On the 1st start of the day & for tactical exercises the bird was started in the Hardened Aircraft Shelter (HAS). Open front & rear doors of the HAS & light 'er up. The hydraulic panel below the power plant at the rear of the aircraft is lowered during start up so the 'back end' man, yours truly, can check for leads after the engine is started. Once all is good back end boy swings the panel up & latches it, then the 5 finger check coordinated between pilot & front boy (girl in some cases even back then ;) ) proceeds before the rocket is sent on its merry way. Anyhow, as back end you get to experience the J79 up close & personal at idle, which I think is somewhere around 60%, perhaps a little higher. Even at idle one can feel the beast....

What a good instructor im so impressed . So good explanations. Thank you so much.

Google the inboard retention plate on a Blackhawk. Safety wire nightmare.

The monthly view spike has struck again xD

@15:00 - talking about "the physical linkage" for VSVs and "it's can't detect a near-stall condition and back off" gave me an idea... You are probably aware of the existence of hydraulic lifters in piston-engine valve trains to modify the valve timing... i bet it would be possible to design a VSV ring linkage with a hydraulically-variable length to allow the FADEC to vary the pitch of individual VSV rings relative to each other.... It would be really interesting to see a modern airliner engine using such a system coupled with per-stage sensors to detect an oncoming stall and interrupt it by reducing the pitch of just the stage or stages experiencing critical airflow.

🤔🤔💯

Hello! While I understand your explanation of a compressor stall, i think it would be cool if you could assemble a hollow compressor case with the VIGVs actuating linkages intact and get a shot of them in action from the inside without the compressor in the way. Is such a setup possible for illustrative purposes? Thanks!

It’s pretty cool tbh mainly because I know nothing about planes, all I know is that I make some parts to make those turbines! It’s awesome

What a very informative video it is! ❤

what initialy starts the turbines? gas thrust?

I recently found your channel and have been watching whenever I can. My dad was an A&P for Allegheny Airlines in the 70s and worked on JT8Ds and JT9Ds. I took a different career path to a locomotive engineer but still love learning about turbine engines. Off topic from the video ,but I bought some compressor blades off ebay years ago. Is there any database to find out which engine they're from? Thanks!

Another feature i found interesting in school is that the compressor doesn’t stall all at once, when one blade stalls it perturbs the flow around it and can propagate or form waves and other nasty things

Good advice. I too, did not listen. Thanks, JZed

Great video. While they don't use hydraulic motors to start the main engines directly, some combat aircraft like F-15, F-16 and F/A-18 use them to start the small gas turbine (JFS or APU). The hydraulic accumulators are recharged when main engines are operating, but if the pressure is too low, ground crew has to manually pump them before start. If you google "F-16 manual pump" you should get some photos of ground crew with a big lever stuck in the left wheel well of the aircraft. So in a way these fighter jets are started with good old muscle power and a hand pump.... that charges the hydraulic accumulator, that powers the hydraulic motor, that starts the gas turbine, which cranks the engine through a gearbox (F-15, F-16), or air turbine starter (F/A-18).

Why was V1a covered up??

very nice video, but could you provide the subtitles for those with poor listening skill like me, anyway, thank you for your video which does me a favour a lot.

Drop the screw doobiedoobieding

As I watch this mams videos. I realize his education is way beyond an average gas turbine engine mechanic. He has a very good understanding of very complex concepts in design and heat transfer technologies and metallurgy. Metallurgy is a subject that is more difficult than a nuclear physicist. Metallurgy is so complex that many will specialize in a group of metals such as non ferrous, ferrous, Titanium and it's alloys, Grasses and bronze, etc... I used to teach Metallurgy and am impressed with his knowledge of so many of these areas of expertise. I also was a welding engineer who built gast tibine engine hot zone components, mostly combustion cans. Someday I want to visit his shop and learn more in person. My last bucket list thing to do while alive. May visit after I pass...😅

When I was an aircraft welder at Langley AFB in Virginia I was watching a mass takeoff of all our flyable F15s going in pairs, side by side when one infrint if me in full afterburner suffered a conoressor stall and lost lift. The wingman dropped his throttle and stayed next to him as he recovered very quickly and still took off, just used up a few hundred more feet of runway. Kept going and did not return to base as pilot didn't see any reason to return.i couldn't believe how quickly that engine recovered tho. I would say no more than 5 seconds and he was at full throttle again. F100 Pratt & Whitney engines.

Had a 79 in 1989 that when you snapped the throttle from mil to max would over temp due to nozzle not opening fast enough. The engine would over temp and drive the speed below 87%, that would take the engine out of A/B then the speed would recover and the A/B would light again and start the cycle again. NAC had an internal failure.

In the Air Force as soon as an engine cools down to a set temperature, the engine covers are put on the front and back if the engine to protect them from damage from flying from debris and any living critter from making a home inside the engine.

Enjoyed.

A good series Jz, thanks

thats how we polish granite aswell

omg why have I never thought of that?

My Grandpa used to tell me that. 'Don't get old', he said. Now I know why.

There's a well known video of 757 ingesting a crow on takeoff, engine stalls, with flames shooting out of it (why periodically?) until crew shuts it down, plane returns to airport.

I could be wrong here but I am under the impression that many compressors work best at a specific air ingestion rate. This has been told to me as the reason for needing the ramps and spaces between the fuselage intakes and engine intakes. Mt favorite example for this is the F-4 as it had two different engines EG the SPEY in RAF service. Apparently the intake ramp activation happened at the same IAS as the J-79 engine variant. I was told that since airlines should not hit transonic speeds so they do not need them. However in extremely turbulent air I'm guessing you could have a 100kt difference in airspeed which would give the compressor a really hard time. This is roughly what wiki says but TBH I do not 100% trust either source.

"Don't get old" is good advice bur inevitable. I just turned 70 last October and am going in for a left hip overhaul next month. Believe me, keep your carcass in shape, whatever it takes.

my mom told me to not get old and i didnt listen :< lol

You want to know my my old man at the first job said? I sat down. Put his lunch box on the table and took out his sandwiches. He looked at it and took a bite. 'Not cheese again;' I asked who made them. He did.

Don’t get old! 25 years ago I was waterskiing,playing hockey, working out, giving blood, riding bike and working 50+ hours a week, 10 years ago I was riding bike and working 50+ hours a week, these days I hope to do some of those things again someday and work 40 hours a week. By the way compressors stall because shit wears out!

I had a stall I was here at work for at a power plant, LM6000. The unit it approx 100 yards away. It shook the building, it got everyone’s attention. They trip immediately. Then comes the borescope. 😂

Appreciate the prelude. There can't be many here who don't understand that if they enjoy content, there are actions that may get them more of the same. We don't nedd the annoying reminders. Thanks! And I don't need a metal wallet or a VPN.

I am currently building a jet engine at 14 this video and many others like it have helped me a great deal in understanding how it all works

Now you got me worried! Compressor stall is not that bad, it could be flown with no problem, even if flames are shooting out at both ends, everything is OK. The stall may just be due to little dings, or just ageing. And then I worry. This thing is damaged! Better go into another plane!

And again, another very interesting video.

A word that was used a fair amount by one of my college profs that seems particularly apt in this case: You take a perfectly running engine then "perturb" it. Kick it, run a goose through it or volcanic ash - you perturb it. A manufacture will do this in a controlled manner but once your engine is out in the wild; what perturbs it is no longer controlled. The prob was fond of kicking things to perturb them. :^) Spinning tops, excessive voltage - you get the idea. Anyway, I also grew fond of the word.