How Auxiliary Power Units Work

How Auxiliary Power Units Work | Part 1 : Starting

Рет қаралды 181,979

5 ай бұрын

Aircraft type.
* Boeing 777-300ER
APU engine.
* Honeywell 331-500
Aircraft systems explained
* Auxiliary power unit
* Electrical load management system
Major components covered.
* Main and APU battery, power distribution panel, APU engine, air inlet duct, inlet door, apu dc pump, electric actuator, fuel cluster, ignition unit, igniter plug and APU controller.
* Reverse flow annular combustor, centrifugal compressor, axial flow turbine, swirler, fuel nozzle, accessory gearbox, electric starter, pawl clutch mechanism, impeller, diffuser, stator, rotor, exhaust duct and fuel manifolds.
Software's used for making the video.
* Blender 3.6 and Filmora 10
Background music used in the video.
* (Filmora stock library)

Пікірлер: 132

@SplashJohn 4 ай бұрын

I'm not in aviation, but I can recognize an excellent graphical and verbal presentation when I see one. Good work!

@ryanreedgibson 4 ай бұрын

My dad and brothers worked on the industrial piping for the Honeywell plant that rebuilt these in Arizona. The plant did nothing but rebuild these APUs all day long. Awesome video!

@thabg007 4 ай бұрын

o man I remember the days on the flight line when I was in the Airforce having to listen to those screeching loud APU's 8-12 hrs a day, Yes I had (double) hearing protection. Its louder than the turbofan engine is (at idle). We used the APU to generate electrical & hydraulic pressure to load the gun system with ammo while at the same time removing the spent shell casings. There was a machine to connect to externally for electricity and hydraulics, it was taught to us in practice. But in real world use, it was never used, well at least not at the base I was at.

@po1ly414 4 ай бұрын

A-10?

@thabg007 4 ай бұрын

@@po1ly414 yea, how did you know?

@aarond.8831 4 ай бұрын

A-10. One of the few that keeps its empties.

@grumpyBSTRD 4 ай бұрын

Security forces and guarded c17’s and kc-135 refueler. Never knew wtf was screeching every damn day until I started getting into flight sims. It all made sense lol. Ear pro did nothing 😂

@Greatdome99 4 ай бұрын

Military aviation equipment is exempt from federal emissions, noise and fuel efficiency stds, so they are usually loud, smoky and toxic. Commercial is not.

@SimonButler 4 ай бұрын

I work on 777s every day and still found this presentation informative and well made! Great job!

@BlackFoxFalcon 4 ай бұрын

Masterpiece of engineering. Like pretty much everything in aviation.

@CHOXON2CHOXOFF 4 ай бұрын

As usual, awesome animation and detailed. Keep going, we need such videos in our field for better understanding.

@AircraftScience 4 ай бұрын

Thanks, will do!

@kellyfernandx 3 ай бұрын

I'm studying this to help my fiancé answer a test at work... omg this is so complicated lol the engineering behind airplanes is just insane... amazing

@user-mv6hy3pe4s 4 ай бұрын

crazy quality I’ve ever seen about APU

@rhiannacoady8370 13 күн бұрын

I will be starting to make these in Honeywell in a few weeks!! So excited!

@DavK637 3 ай бұрын

this is a damn good animation for those that are visual learners. thank you aircraft science for taking the time to make this

@gepset 3 ай бұрын

Great video. Interesting to see the APU follow the traditional British jet layout.

@john.enospahitamos3596 3 ай бұрын

Dont stop please. Thanks!

@grantnaval4519 4 ай бұрын

Now this. Is improvement! Amazingly done as always. From GE90 engine start and now goin' to the APU! Amazing and great! Thank you for this. As an aircraft mechanic with this type training. YOU MADE EXPLAINING. Easy. Always here to watch and see you go!

@AircraftScience 4 ай бұрын

Thanks a lot!

@demal1010 4 ай бұрын

Heading been a ramp agent for a certain amount of time for a regional carrier, who used CRJ200's that had the APU exhaust at ground level, you had to walk quickly past all the heat if you were walking back there. (However in frigid temps it was a nice heat source outdoors lol)

@DropBear69 4 ай бұрын

This was excellent. Your videos are getting better with every release. Thanks heaps!

@AircraftScience 4 ай бұрын

My pleasure!

@eneebarry6764 4 ай бұрын

It’s absolute and beautifully crafted animation and perfectly rendered here. Tombs up.

@oOSpecialProskillsOo 3 ай бұрын

i am probably never going to need this knowledge, but it was very well broken down and presented, great job

@flapjack413 2 ай бұрын

I've always wondered where the air intake for an APU was. Very cool!

@garyroachester1500 4 ай бұрын

Great presentation! can't wait for part 2

@vishwajeet7806 Ай бұрын

Very nicely explained ❤

@Humshkin 4 ай бұрын

Best visual video & best explanation ever!! ❤️❤️❤️

@11snakePlayz 4 ай бұрын

This will be very useful for a project I'm working on in a game I play.

@lunganzimande8056 3 ай бұрын

Awesome video! Better than most CBTs

@ccacrislan 4 ай бұрын

Absolutely brilliant, I really like and appreciate your job. Thank you. Always looking forward for more of your videos.

@AircraftScience 4 ай бұрын

Many thanks!

@formatogrande397 4 ай бұрын

brilliant content

@Magan-lg4bc 3 ай бұрын

Absolute GREAT.

@user-yf5td1zf6s 26 күн бұрын

it's good job, wonderful,brilliant

@seantaggart7382 4 ай бұрын

The apu is awesome Its more than just a starter Its backup power and Emergency pneumatic! Its nice

@alexkazzeo6208 4 ай бұрын

Fantastic graphics, excellent explanation. Superbly done. Better than the Boeing one. Teach them something.

@JanV29 4 ай бұрын

Your videos are bonkers man !! Love them ❤

@AircraftScience 4 ай бұрын

Thank you!

@southernpilot 4 ай бұрын

That was very well done.

@artysanmobile 4 ай бұрын

Superb video!

@stachowi 4 ай бұрын

This channel is amazing.

@sssaeedssahz.1434 4 ай бұрын

Excellent👌❤

@lmoraz 2 ай бұрын

Very good animation.. waiting for part 2, thanks

@richardbriansmith8562 4 ай бұрын

Awesome Video 😊

@zlatimirzdravkov8940 2 ай бұрын

Thanks ! Useful video ! I guess it took you thousands of hours hard work!

@chitralisontakke7186 3 ай бұрын

Waiting for part 2!

@n.s.shankar 4 ай бұрын

Brilliant❤

@demal1010 4 ай бұрын

Would have been nice to see the pneumatic start option as well as the electric. It's not available till an engine or exterior air supply is running, so i hope it will be covered in an upcoming video.

@AircraftScience 4 ай бұрын

I will cover the pneumatic start system in the APU bleed air section of the series.

@jepleas9159 4 ай бұрын

The dark shadows with the black background make the details difficult to see. KZfaq animators like Jared Owen and AiTelly include more contrasting shades and colors to make the details more visible. Nice work. Your effort really shows.

@dalemanolas5994 4 ай бұрын

Is the alternator permanently geared in or does it have an electric clutch to engage it once the APU gets up to speed? Presumably the APU drives a hydraulic pump as well. Does that have a clutch? I'm just wondering if the starter motor has to spin all that stuff or is all of that disengaged during starting?

@aviationnmaps 4 ай бұрын

Remember that guy that asked you to make this a year ago?

@AircraftScience 4 ай бұрын

Yes, thanks again for suggesting this topic.

@SticksTheFox 3 ай бұрын

The Video: Informative, technical, intresting The Music: Battlefield Butt Rock/ Command & Conquer

@RounakKushwaha 4 ай бұрын

Sooo good

@russchadwell 4 ай бұрын

Are there any "APU" engines that might be rigged to fly some sort of small aircraft? A means for some hobbiest to get some inexpensive second hand "jet" engines.

@CybershamanX 2 ай бұрын

(0:23) Oooo... So shiny! 😉😎

@BobSmith1980. 3 ай бұрын

I love the graphics

@dilandias4018 4 ай бұрын

Awsome bro....thank you for such videos

@AircraftScience 4 ай бұрын

My pleasure!

@lilawaffel186 3 ай бұрын

Where is part 2? This is so good thank you!

@AircraftScience 3 ай бұрын

I'm working on it!

@davecrupel2817 3 ай бұрын

So the 777 apu has a pneumatic start option. Interesting. Makes sense if it needs to crank at altitude, and you want to conserve bat power.

@matthaxx7137 4 ай бұрын

Thanks. Question: Does the pawl clutch run the ratchets continuously after starting or is there some sort of disengagement mechanism once the APU is up to speed? Seems that there would be a lot of wear otherwise.

@AircraftScience 4 ай бұрын

The clutch disengages once the motor stops at 50% RPM. As the engine speed increases, the pawls move outward against their spring tension due to centrifugal force. This eliminates contact and thereby reduces wear.

@maheshanura5413 4 ай бұрын

Thank you very much sir.....🙏🙏🙏

@AircraftScience 4 ай бұрын

Most welcome

@jaiyp77 4 ай бұрын

I'm very amazed with your animation videos, it really helps to fill my knowledge. But there's something I'm wondering about the engine, how does the fuel metering system work?

@AircraftScience 4 ай бұрын

Hi, I have plans to cover this topic in the APU performance (part 3) video.

@jaiyp77 4 ай бұрын

@@AircraftScience Thank you very much

@user-el9mn9fi8e 3 ай бұрын

I remember the noise of C130B’s GTC cranking up…. very loud…

@r.robbie7918 4 ай бұрын

Great, ending this interesting episode without telling me HOW electricity and hydrolic pressure is generated... I assume it is coupled somewhere.

@suhailummer2697 4 ай бұрын

👌

@motionsick 2 ай бұрын

This complexity is the reason there are no competitors to Boeing and Airbus. Such a colossal undertaking building a single one of these aircraft.

@troybowen3024 4 ай бұрын

You Really Haft To Be A Genius To Be A Pilot And Designer And Innovator Of These Jet Engines I Tip My Hat To Them

@orunabho 4 ай бұрын

I always thought there is an internal combustion engine there, a motor at work there. O, a jet engine!!! Nicely explained. What about thrusts it generates?

@justing42 4 ай бұрын

It is negligible. They shut it off after engine start.

@user-pg5px6qf7z 4 ай бұрын

Nice education video ❤! How about pneumatic start! Never use on line ! Ha!😂

@juggsauce 4 ай бұрын

Always wanted to find a timed-out, old apu and put it in an old truck. Power an electric motor. Wouldn't be very efficient but fuck would it be cool.

@udayakumar5348 3 ай бұрын

Small turbine works behind produce small amount of electricity and A/c to cabin and also bleed air to start engine

@erdum 4 ай бұрын

❤

@abdulla9042 4 ай бұрын

Hello, I can translate your video?

@mubashirghani9344 Ай бұрын

Please make video on APU bearings and seals..

@AircraftScience Ай бұрын

Noted!

@myheart-ok4ie 4 ай бұрын

We want a video of how to run the engine via the APU

@AircraftScience 4 ай бұрын

The main engine start will be covered in the second part of the series.

@ryanreedgibson 4 ай бұрын

When will part two be done?

@AircraftScience 4 ай бұрын

Hopefully, late January.

@WhyHow-vn6fo Ай бұрын

What software did u use bro

@AircraftScience Ай бұрын

Blender.

@WhyHow-vn6fo Ай бұрын

Tq for ur reply and please upload some videos about modelling

@randygravel2057 3 ай бұрын

Ok this video ends where the apu is running. You forgot to tell how is the electricity made. Where is the “auxiliary power” made?

@rickybrazzell7348 3 ай бұрын

Nice presentation but where is the generator part of the APU?

@AircraftScience 3 ай бұрын

Coming soon!

@musiegirma2728 3 ай бұрын

Can you do for airbus apu

@Takeitlightly6 Ай бұрын

That plane looks very pimped

@josephjeno6709 3 ай бұрын

When will come next part video

@agungdwif 3 ай бұрын

Part 2???

@MonkPetite 4 ай бұрын

And apu with an air starter as an option ? That’s a wrong stament. The igniters work before fuel is added. Fuel nozzles are mostly duplex. Meaning they have two stage function for starting and normal operations, you can’t dump all fuel less the 40 %.

@LezamaDamian 4 ай бұрын

Nice video. However, it's kind of too slow with long pauses, it would be way better if it were more dynamic. Also is it a human narrator or AI? A little more emotion would not hurt either 😊

@AircraftScience 4 ай бұрын

Noted!

@-fuk57 2 ай бұрын

Robot voice.

@apivovarov2 4 ай бұрын

turbine blades should be curved opposite to what is shown on the video . The angle is ok, but the curvature shape is not

@tumurbaatarchinzorig273 Ай бұрын

Landing gear pls

@AircraftScience Ай бұрын

The next series will be on landing gear.

@tumurbaatarchinzorig273 Ай бұрын

@@AircraftScience Thank you so much!

@keitha.9788 2 ай бұрын

Get rid of the black background. It will increase the contrast and makes your diagrams more visible....

@lordpickle8424 4 ай бұрын

Thank you, come again!

@Lx-photos 21 күн бұрын

Very dark. Nothing visible.

@jeffy210 4 ай бұрын

You don't really think about the fact there's a 3rd engine on a twin engine aircraft.

@lilsnowycaraudio 4 ай бұрын

Actually 4 if you also take the rat into account

@justing42 4 ай бұрын

@@lilsnowycaraudiothe rat is a pump

@user-jq2rf4nf3o 2 ай бұрын

This is what I do with APUs - GTCP 36-55-c from an AH 64 and the M1A1 gen set from the Air Force for the Jet Ecec kzfaq.info/get/bejne/nLigZdhyvr3Fj3U.html

@RounakKushwaha 4 ай бұрын

😮

@MrPLC999 3 ай бұрын

Nice to get an authoritative presentation for a change, instead of the usual tedious dumb-down BBC-style documentary where every sentence has to contain a word like enormous, massive, vast, prodigious, tremendous, monumental, colossal, immense, gigantic, mammoth, stupendous, etc, etc, etc...

@thardyryll 2 ай бұрын

Good point. I get so weary of the gearhead shows where every host has to act like he has just snorted 20 lines of coke and meth just to make the presentation sound “exciting”.

@zachansen8293 4 ай бұрын

that was a REALLY well done video. I'm much more likely to downvote a bad video than upvote a good one but I had nothing bad to say about this other than I'm sad the next one isn't out yet.

@engchoontan8483 4 ай бұрын

Get a truck mechanic to sit in class with paper notes version of this And similar to this, gas-turbine notes And also turbo-fan notes and turbo-prop notes and turbo-shaft notes Tell him to treat 28vDC as 24v truck battery. Impeller start as air-brakes of truck. Cascading battery to air tank to brakes to impeller to battery then battery and impeller the thingy. The thingy should impeller flow lub and fuel by crank and the battery should blow the bloody thing up. Redraw something over the weekend by combining 2 shafts like a cockster turboshaft into a 2 shaft turbo prop and use air around duct-in-duct to cool itself, vanes support. 2 shaft can exhaust thrust straight and rotor big. See what happens.

@engchoontan8483 4 ай бұрын

Cocksters use wire mesh covers instead of stators and no chicken-chop

@engchoontan8483 4 ай бұрын

Double shaft designs of turbo prop and turbo shaft allows intake to be almost anywhere and angle, same for exhaust and resultant thrust and also shaft. 3 items put almost anywhere and almost any angle. Terminology of variable geometry is expensive. Same for variable pitch and variable thrust vector (TVC - thrust vector control) Life hack = anti name-dropping, anti brand-dropping, anti deep-meaning, anti fancy wording, anti university terminology... Cross discipline, cross industry, ... Cheaper