How Auxiliary Power Unit Works | Part 1 : Starting
ฝัง
- เผยแพร่เมื่อ 27 ธ.ค. 2024
- 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)
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!
I'm not in aviation, but I can recognize an excellent graphical and verbal presentation when I see one. Good work!
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.
A-10?
@@po1ly414 yea, how did you know?
A-10.
One of the few that keeps its empties.
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 😂
Military aviation equipment is exempt from federal emissions, noise and fuel efficiency stds, so they are usually loud, smoky and toxic. Commercial is not.
I work on 777s every day and still found this presentation informative and well made! Great job!
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
Love that this video is in "dark mode". So much easier on the eyes.
Masterpiece of engineering. Like pretty much everything in aviation.
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)
I've always wondered where the air intake for an APU was. Very cool!
As usual, awesome animation and detailed. Keep going, we need such videos in our field for better understanding.
Thanks, will do!
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!
Thanks a lot!
this is a damn good animation for those that are visual learners. thank you aircraft science for taking the time to make this
crazy quality I’ve ever seen about APU
Great video. Interesting to see the APU follow the traditional British jet layout.
This was excellent. Your videos are getting better with every release. Thanks heaps!
My pleasure!
i am probably never going to need this knowledge, but it was very well broken down and presented, great job
It’s absolute and beautifully crafted animation and perfectly rendered here. Tombs up.
Absolutely brilliant, I really like and appreciate your job. Thank you. Always looking forward for more of your videos.
Many thanks!
I will be starting to make these in Honeywell in a few weeks!! So excited!
Absolutely amazing work. So helpful video!
Fabulous animation and explanation! Thank you!
Thanks ! Useful video ! I guess it took you thousands of hours hard work!
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.
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.
Fantastic graphics, excellent explanation. Superbly done. Better than the Boeing one. Teach them something.
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.
I will cover the pneumatic start system in the APU bleed air section of the series.
This complexity is the reason there are no competitors to Boeing and Airbus. Such a colossal undertaking building a single one of these aircraft.
The apu is awesome
Its more than just a starter
Its backup power and Emergency pneumatic!
Its nice
Dont stop please. Thanks!
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?
very helpful !!! thank you so much for this video 🙏🙏🙏
My pleasure 😊
Awesome video! Better than most CBTs
Very good animation.. waiting for part 2, thanks
Best visual video & best explanation ever!! ❤️❤️❤️
This will be very useful for a project I'm working on in a game I play.
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?
Hi, I have plans to cover this topic in the APU performance (part 3) video.
@@AircraftScience Thank you very much
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
Great presentation! can't wait for part 2
Your videos are bonkers man !! Love them ❤
Thank you!
What if it's raining and air inlet door are open? Is there some filter to prevent water getting inside the APU turbine?
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.
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.
why igntion and fuel supply on APU take plase with 7%, but ignition and fuel supply on main engine on 21%?
Where is part 2? This is so good thank you!
I'm working on it!
Great, ending this interesting episode without telling me HOW electricity and hydrolic pressure is generated... I assume it is coupled somewhere.
When will part two be done?
Hopefully, late January.
why compressor wheels look like centrifugal compressor, unlike compressor wheels of main engine?
The dark shadows with the black background make the details difficult to see. TH-cam animators like Jared Owen and AiTelly include more contrasting shades and colors to make the details more visible. Nice work. Your effort really shows.
Very nicely explained ❤
Brilliant videos!
First video watched, subscribed.
Remember that guy that asked you to make this a year ago?
Yes, thanks again for suggesting this topic.
Awsome bro....thank you for such videos
My pleasure!
it's good job, wonderful,brilliant
The Video: Informative, technical, intresting
The Music: Battlefield Butt Rock/ Command & Conquer
3:11 you say that fuel cluster consists of mech pump etc. Then you say that controller commands the fuel valve, and nothing about pump
Awesome Video 😊
Please make video on APU bearings and seals..
Noted!
is the RPM expressed as a percentage of maximum speed?
Yes!
Thank you very much sir.....🙏🙏🙏
Most welcome
This channel is amazing.
That was very well done.
Absolute GREAT.
Nice presentation but where is the generator part of the APU?
Coming soon!
Excellent👌❤
Waiting for part 2!
Small turbine works behind produce small amount of electricity and A/c to cabin and also bleed air to start engine
Nice education video ❤!
How about pneumatic start!
Never use on line ! Ha!😂
I love the graphics
Superb video!
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?
It is negligible. They shut it off after engine start.
Very dark. Nothing visible.
(0:23) Oooo... So shiny! 😉😎
Where is the generator?? You explain the mechanical turbine but… the electrical part?
Part 2!
Hello, I can translate your video?
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 %.
What software did u use bro
Blender.
Tq for ur reply and please upload some videos about modelling
We want a video of how to run the engine via the APU
The main engine start will be covered in the second part of the series.
Ok this video ends where the apu is running. You forgot to tell how is the electricity made. Where is the “auxiliary power” made?
turbine blades should be curved opposite to what is shown on the video . The angle is ok, but the curvature shape is not
Nice!
brilliant content
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.
Amazing video has been created...thanks a lot
Most welcome!
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 😊
Noted!
Can you do for airbus apu
Brilliant❤
Part 2???
Landing gear pls
The next series will be on landing gear.
@@AircraftScience Thank you so much!
Get rid of the black background. It will increase the contrast and makes your diagrams more visible....
When will come next part video
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.
Thank you, come again!
You don't really think about the fact there's a 3rd engine on a twin engine aircraft.
Actually 4 if you also take the rat into account
@@lilsnowycaraudiothe rat is a pump
yes gud thank's
Sooo good
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...
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”.
That plane looks very pimped
I got one at my house we call it a generator
👌
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