Don't panic! Its normal!

[@WayTwo]

Why am I watching this I don't even have a plane xD

[@x-f45apthorianclassmegabit19]

WayTwo same

[@dirtbikemaster8057]

WayTwo same

[@sephirothtwo]

You dont have a plane? pfffffff peasents

[@nokobz2624]

Peasonts*

[@Alles1998]

Go and buy one

[@NateCraven318]

The reason for the looseness of the blades is to prevent any vibrations from building up in the fan, which could cause a catastrophic failure. When the engine is operating, their is an immense centrifugal force on each blade, which seats each one very tightly in its slot, so it no longer wiggles. The looseness allows the blades to find their best position as the engine spools up and this makes the fan very balanced and eliminates vibrations.

[@DatamasterCorporation]

*Rich people problems*

[@txav8tion]

The Real rich people problem is decided where they want to go! always changing times and destinations. Thanks for watching!

[@SgfGustafsson]

Man those rich people would have a pretty big problem if those blades were rigid.

[@itzpepi143]

/r/fifthworldproblems

[@kimfucku8074]

Nope, same on big engines for the poor people

[@420f37]

if you spent money on a plane i'd assume youre now broke

[@hebelehubele872]

Now i need a plane for this non problem thing to be my problem

[@CarbonComp]

When you have so much depression having problems are your hobby

[@stanford6397]

Platinum GT why does your profile pic match and not match your comment at the same time

[@oliverkeating4894]

Very interesting - I read up, apparently this is to prevent resonance from occurring, if they were connected rigidly then at a certain rpm they might resonate and cause the engine to disintegrate! In fact, rust and corrosion can cause them to cease up, so if you find the blades are rigid you actually do not want to fly!

[@Drakey_Fenix]

This is really cool. I didn't know that

[@new.handle]

That is it ;) and that resonance could than be sent along wing to fuselage... to prevent this (among other things), wings are also flexible...

[@FatalTaco]

Oooh so that's why. Which reminded me when the Germans were trying to make the first jet fighter it was delayed for years until they figured out resonance was breaking up the engine into bits so they shortened the blades for a quick fix.

[@florin604]

plus the engine takes less mass

[@gabrielsasala1875]

Really because my college has several engines they are sold like a rock.

[@Nox665]

I just got my airplane from the plane dealer down the road and I was wondering what this noise was... Thank you for this informative video!

[@timmanboy1]

I'm already panicking

[@NoobieLandCity]

I'm Patrick too

[@jaromirandel543]

The reason of the noise is that there is small gap between every joint. The reason is to kill the resonance.

[@saprpavel]

I'm pancake

[@Qualitaetspruefer]

Use some duct tape and the noises are gone.

[@txav8tion]

True! or super glue...that would work too!

[@Crankiebox99]

TX av8tion FLEX TAPE

[@mikewizz1895]

Why would you duct tape it, *surely* you would pritt stick it

[@GlitchedBlox]

it only make it heavier.

[@findingpebble8615]

why do I feel like youre a mechanic LOL

[@rhubarbpie2027]

I was NEVER taught this in my tech school and here I am, having been working on F-15Es for nearly 10 months and I learn about this through KZbin. Thanks, Air Force.

[@HDTomo]

Well you can fix a board? Yes? Well there you go thet didnt need to teach you

[@luaking84]

Expensive fidget spinner!

[@txav8tion]

Yep! you can't afford one!

[@BrandonLe621]

And is not a fidget spinner

[@seymorekuntz9152]

they sound like they are made by Harley Davidson.

[@txav8tion]

we wish! it would much cheaper from HD.

[@Dasdembo]

More likely by ducati

[@justinatorification]

Nah not a Ducati.... the electrics wouldn't cut the mustard......

[@ccubsfan94]

Sounds more like a dry clutch on a Ducati.

[@vector6977]

You mean Triumph and their world famous Lucas Electrics?

[@gerlingtascam1907]

@2:10 “Wheel of Fortune” I like to buy a vowel please.

[@yak55x]

Engineer 1 - "The blades keep cracking." Engineer 2 - "Let's just let them be loose and clank around"

[@maximilianbeyer9268]

This is actually really important. The rotors need to be a little bit loose to damp vibrations (which can damage the engine pretty badly) while the engine is running

[@spoogle621]

I never knew this, pretty fcking amazing considering these spin at a ridiculous rpm. I always though that they were rigid like the fans on a turbo charger.

[@AgentJayZ]

Excellent!

[@txav8tion]

Thanks! I have watched almost all of your videos over the past 2 months. Great information.

[@santinojozefmiller7721]

@@txav8tion What if they were tight?

[@gilli8669]

I have never heard that before... but it sounds really cool! for some reason I like the sound... it seems like it would make sense because the size of the engine...

[@txav8tion]

The sound and vibration of fuel being intruded as you are right under its feels really neat too. You can feel the low vibrations. I will film our P&W 306A engines...they have a really neat sounding startup.

[@theevilmeister]

The point of this is to reduce vibration by allowing the blades to find their natural center when the centrifugal force beings acting on the blades when spinning. It's a very clever solution to a problem which plagued early turbojet development.

[@adhdaviator]

Thank you!This helps me understand the turbine engine more......since I am an aircraft technician student currently

[@txav8tion]

Glad it helps. Enjoy your education and have fun! Aviation is fun and interesting ...most of the time.

[@adhdaviator]

yeah.....studying this is...complicated...really2 suffering at times

[@geoffreyherrick9900]

The blades can move to prevent stress buildup at the root.

[@sduru]

instead stress build up with passengers

[@ErobbClips]

hahahahah your comment made my day dude

[@bagochips1208]

OOF

Geoffrey Herrick Is thermal expansion also part of the reason they have play in the them?

[@roybm3124]

Yes correct

[@ranavalona24]

Thanks. That was interesting. The last one especially showed very well what was happening. It's just the top one that clangs as it goes over-centre.

[@worokgaming2379]

I was never expecting the blades are loose. I'm flying on an airplane 7 times and I never knew that.

[@txav8tion]

We get asked often what that rattling noise is from our guests...its very common not to know. Thanks for watching! and Now you do KNOW!

[@SgfGustafsson]

kzbin.info/www/bejne/eYm2mmd9jbqioNEm15s

[@dawsonthehoonigan6180]

Phew I'm glad I found this video because I was too scared to fly my jet that I don't own because of the noise I didn't hear in the jet engines I don't have

[@yanaros134]

As long as you don't hear that on startup you're goooood

[@txav8tion]

If you hear that on start up...Im OUT!

[@yanaros134]

TX av8tion haha I worked as a lineman for a while when I was at a&p school and every lineman used to get a bit cautious

[@ronparrish6666]

I remember year's ago in Toronto on the ramp when the Air Canada L1011 was shut down the wind would turn those blades of the Roles Royce engines and they would be making one hell of a banging noise

[@paawian]

LoL, thanks for explaining, if I ever heard that while stepping in or out of a plane I would certainly be worried, Now I won't.

[@txav8tion]

Many of our passengers ask what that noise is when they exit the plane. That’s why I made the video... info is gooood. Glad your won’t be worried! Thanks for watching.

[@paawian]

Sure thing :) btw: the guy in 0:29 is weird :D

[@txav8tion]

I agree!

[@marvinkitfox3386]

OK.. Learn something new every day.

[@Nathan-fs2bz]

that's something a jet engine would say

[@coltendixon1782]

Awesome! Now I dont have to worry about replacing my imaginary plane engine fans!

[@toazterxd6378]

Actually I love those sound :D

[@txav8tion]

you and me both.

[@MikadoRC]

2:03 omg, shit is about to fall apart xD

[@spicyprovolone4986]

From the thumbnail I thought it was a joke about dropping a tool in the engine lol

[@SLIMRISKY]

Engine blows up Pilot: don’t worry guys it’s normal

[@garonfr]

Thank you, that's good to know 'cause I was really wondering.

[@txav8tion]

Glad the video helped ya!

[@NickJustWill]

Negl this really cleared things up for me

[@DemarticusStoneGaming]

Guy's got bigger balls than me, standing directly in front of a jet engine lol

[@txav8tion]

It's a SMALL jet engine!

[@TempoDrift1480]

Woah... That's wild as fuck but after reading some comments about resonance I totally get it.

[@txav8tion]

it does blow your mind how loose some of the fan blades are....but all by design!

[@Rahul-ey1oq]

Thank you, now all I need is a private jet

[@txav8tion]

@rahul you and me both! and a dump truck filled with money so we fan fly our private jets!

[@crispy-k]

Glad i didn't watch this before getting on a plane, kinda creepy to see that they are just sitting there "loosely" xD Nice video ;)

[@noobbassist1352]

O my goodness big fan blades creep me out

[@txav8tion]

but keep you going forward!

[@evanbrace5111]

That's not a fan blade, (pulls out GE90 blade) THIS is a fan blade!

[@DroneFragger]

It's for Thermal Compliance. essentially, when the blades were close fitting when they were at room temperature, when the blades heat up from the engine being on they will expand into the housing and sieze solid. This is obviously bad. hence, the blades are designed such that they're a rattling fit, but during usage conditions and temperature, they'll expand slightly and be a perfect fit inside the housings.

[@chrisward4576]

Well, that pretty much did it for me. I ain't flyin on one of those things anymore

[@WormulonDCP]

When it's 12 am and I find I'm in this part of KZbin.

[@cjuk81]

Ridgid is bad in this case, in the same way if a tree didnt bend in high winds. its a good thing they wobble a bit and they are not loose

[@antonove-1752]

Chris White I

[@ghitaciprian]

0:29 clandestinely walking underneath the plane 😂😂😂

[@txav8tion]

The engine was shut down....and coming to a stop. But we are under the engines when they are running very often. We check for fuel leaks, oil leaks, and other inspections with the engines running. Not dangerous... unless you put something in the inlet! Thanks for watching.

[@gilangrr21]

I thought this was similar to that "the sound you didn't want to hear" video thingy

[@BlackCatRedScarf]

Interesting. It's much more loose then I expected.

[@rainstormm1]

always hear that noise and it personally kills me because 767 engines are so loud with the clicking

[@triv7252]

Sounds like a new Ducati

[@darodjati]

0:28 did you notice it ?

[@ovimaltine1680]

My guess is that if you didnt have the extra space, the blades would burst due to thermal expansion while running after a while because they would be pressed against each other, leading to unhappy dying passengers, which wouldnt be too nice. The same as the Sr-71 Blackbird, which LEAKED FUEL at launch, because otherwise the tiles it was built of would burst due to them expanding and with that pressing against each other. Dont complain about them not knowing their stuff: if you think the design and assembly of this wonder of technology is easy, then i beg you to redesign this engine and send me a link of its testrun. Sorry for sounding mad, but people should not judge things, of which they dont even grasp their fundamental rules. I applaud the thousands of people that worked for decades, creating this wonder of engineering and science.

[@陳亭蓁-u7s]

Could you please make more video about this?😆

[@rob8529]

Cool vid. I had no idea those were loose like that

[@Arkadix11]

I wonder how many people google "strange noises in my plane's engine" to make this video worth making

[@Frederikgliding]

It is like a car you pull back and when you releases it drives.

[@txav8tion]

Yes!

[@qp5448]

That makes me think the turbine blades will break off.

[@123dodo4]

You mean like this wing aint really molded into one but many pieces then they put the pointy hat?

[@txav8tion]

you got it!

[@123dodo4]

TX av8tion Simple.. i can know it by the looks of it..

[@ryanm.191]

as a semi consecutive private pilot, i hear this sound from the fuel pump, and naturally assumed it was a fuel pump trying to keep pressure up in the turbine for some reason.

[@groundshakersociety6637]

Ryan M. Soo can you give me a free flight?

[@SgfGustafsson]

He'd probably get you killed after reading his comment

[@Patrick-zr8tv]

Alright I don't know what you're supposed to learn in your pilots course but I'm fairly sure you're supposed to know a lot about most parts of your aircraft and it worries me that you didn't know this.

[@1MineGuy]

Oh, I thought its not normal, okay thanks, useful gotta go fly

[@american0153]

Agreed 100% I've known this is normal for years too

[@jowenjv4463]

Lol as mechanic on Mirage 2000, fan blade are not free like those. It depends on the engine. Pretty impressive.

[@TheBijouis]

If the engineer put a treble and some bass, the sound must be more good!

[@txav8tion]

Could be the next HIT....the aviation community would love it. Thanks for watching.

[@Wildlifesupernannyfan]

The sound of a realy healthy engine. If it dosnt rattle, something is wrong.

[@brandonlarue9706]

I love Boeing 747s it’s my top #1 favorite plane

[@h.cedric8157]

From Falcon Heavy launch to here, because of the phrase Don't Panic

[@kingghidorah8106]

This is the exact moment when you know you were fooled before with "airplanes are way complex engineering and ensuring constructions... _(Firstly the wings are almost split surfaces attached with BIC pen-sized screws and cylinders, and now the engine is halfly unassembled. Ha ha, and they call us Avgeeks)._ Just taking it with humor.

[@allhandlesaretaken666]

skädäm xD true

[@SgfGustafsson]

The all the blades (fan blades, compressor/stator blades) are fitted extremely securely, consider immense centrifugal force and centripetal force they have to withstand at insane rmp. They are also fitted in such a way that they can "wiggle" as you see in the video, so they do not shatter from vibration. *So yes, "airplanes are way complex engineering"* Have a look kzbin.info/www/bejne/eYm2mmd9jbqioNEm15s

[@derbigpr500]

They way they are built makes the FAR MORE COMPLEX than if they were just attached with bolts. They don't actually move or rattle when the engine functions, but if they weren't "loose" like that they'd break in function.

[@erikhendrych190]

Look up SR 71 Blackbird, they couldn't even seal the tank so it just leaked fuel all over the runway... (JK guys, calm down)

[@StrongEnough78]

What do you expect when someone doesn't know squat about how planes are built or simple physics.

[@mrc14_2]

The P&W JT15D reminds me of an old diesel that runs very badly

[@txav8tion]

I haven't hear one of those in person..but I bet those old engines are loud.

[@superstocklo2398]

These turbines are designed in such precision that they rarely fail and break

[@blakefrost8303]

The sound you never want to hear while working on turbine engines.

[@jeefcake9269]

That sounds like something a turbofan engine would say

[@txav8tion]

Lots of truth in that statement!

[@MadNut321]

Touching turbines with hands. I'm shitting myself just watching this.

[@txav8tion]

These are fan blades not turbine blades. Like big propellers. Thanks for watching.

[@MadNut321]

Ah! Thanks for the info.

[@floppydolphins4123]

Second one you almost got sucked in. Be more careful!

[@txav8tion]

NOOOOOOOOO not even close!

[@randyfatiha]

Me Before watching the video: I want to be A pilot. Me AFTER watching the video: I changed my mind.

[@marcovalentinoalvarado3290]

I remember when i was going to the school on my AH64, old times, it did too much noise like those ones in the video

[@jlalbee]

Blisk components lack this feature, and are used in some very modern turbine engines.

[@tsall100rubiksovler6]

That is scary. There was a part were the engine was turning off. That guy is lucky to be alive. If you get too close to a running engine you can get sucked in.

[@txav8tion]

Noooooo not these engines at idle.

[@mysterygamer48]

Interesting I always thought the blades to be fixed to the hub. The more you know I guess.

[@Waltham1892]

Classic symptoms of a maladjusted turbo encabulator.

[@soobinsbread590]

You spin the engine like its a fidget spinner.

[@txav8tion]

Thats one EXPENSIVE fidget spinner! Thanks for watching!

[@berkahpowerindo8815]

Clearance.. it is man's made..

[@Battlegoblet]

I always wondered abut that noise.

[@txav8tion]

Your not the only one! many many of our passengers ask about that noise.

[@realflow100]

I want to see someone spin a turbine as fast as they can via human power via belt/pully/bike/pedaling/hand/anything to see how much air it can move xD WHY HAS NOBODY DONE THAT YET?????????????? AAAAAAAAAAAAAAAAAAAAAAAAAAAAGH ITS KILLING ME!!!!!!!!!

[@christopherhampson265]

Bollox to that !!! I'll meet you there !!

[@ssaammeelliiss]

Now all i need is a plane

[@txav8tion]

and lots of money so you can fly that plane!

[@Volvith]

So basically, the dove-tail joints have play that get's eliminated during flight because of the g-forces acting on the blades?... Ok. :3

[@txav8tion]

Yep! Its actually eliminated during the first seconds of start up.

[@jacman6409]

METAL EXPANDS UPON BEING HEATED

[@txav8tion]

Yes it does!

[@nickson_2024]

This should be the least of your worries unless you hit bad turbulence and those bladelets ripped off the engine and straight through your window :O

[@txav8tion]

WHAT?

[@wkruse84]

I've never heard a jet engine make the sound it does at 0:29. That sounds like a person trying to compress a sphincter during bowel evacuation.

[@txav8tion]

It could be the sound of a contorted stretch on my tiptoes to reach the inlet of the engine...or trying to compress a sphincter during bowel evacuation...Both sound about he same! Thanks for watching.

[@shawndubay3736]

Kinda scary!! Would have thought theses blades would be welded or very tightly fit and reinforced. Don't want one of those getting sucked into the engine. Kinda wish I didn't see that.

[@txav8tion]

Knowledge is good for you!

[@Qui-9]

Wouldn't movement become a wear point? If resonance is a concern, then why not make them self-dampening? Because this feels like it detracts from precision.

[@demetrijohnsonssirenvideos3590]

When the turbine spins faster the centrifugal forces pull the blades outwards and makes the joints tight preventing the blades from rattling at high speeds

[@luuk341]

Sounds like your average Ducati motorcycle

[@emrekocamese3848]

it sounds like floating brake disc rotors

[@txav8tion]

yes it does!

[@zain786ification]

Put some rubber gaskets for that noise to be insulated

[@txav8tion]

That would probably work!

[@pnkata5169]

I wonder if there is a rich kid watching that and be like ooh so thats the case

[@DarkGT]

That clearance tho.

[@friedchicken1]

is this to permit metal expansion with heat without breaking components?

[@txav8tion]

nope!...Not heat related. The fan blades do not get hot.

[@ravenouslove1]

Im guessing as the engine heats up the fins tighten through thermal expansion.

[@txav8tion]

@ravenouslove1 Nope...the fan blade do not heat up. Thanks For watching!

[@ravenouslove1]

Certain rpm they pull tight then

[@numayerarazi598]

It sounds like my 25 year old A/C if turned on

[@txav8tion]

Get that AC fixed!

[@tommasozucol4160]

Wow nice video!

[@txav8tion]

Thanks!

[@darkdjo]

I heard this suspicious noise one time before onboarding in an aircraft, and I was not really confiant. haha :S

[@txav8tion]

Dont panic! it's normal! now you know.