ATR-72 OLYMPIC before take off - Strange Propeller Effect!!!

[Mobius2258]

The force thats causing the blades to bend is called thrust bending force.

[kinsley2108]

Ye olde rubber props, lol I think it may be the curve in the window combined with the camera angle that gave you that effect.

[TheLASERJAW]

The effect is created by the shutter speed at 30 FPS. As the speed of the prop varies slightly you see this effect as if you had a stroboscope on the prop. With the right strobe speed the prop seems to slow, stop or even reverse. The same with the shutter speed. The camera shutter speed is resonant with the prop speed. Common optical physics. Cute video tho. Good job. 73 de N0RJP

[morbidarr]

@TheMostFamousChannel Indeed. lol

[MisterBouncyBounce]

i gave this video a thumbs down because you disabled ratings and comments on your other shit video "amazing landings 3".

[toy2day]

@MisterBouncyBounce Sorry man. I had to do it in only two of my 150+ videos, as comments were too many and of no importance recently....

[MisterBouncyBounce]

@toy2day well now that you didn't reply back with an insult i feel bad. i'll thumb up some vids to make up for it.

[toy2day]

@MisterBouncyBounce It's ok man, just say your mouce was bouncing while watching my other video!!

[FluffyFries]

@MisterBouncyBounce

Well, I thumbed up the video for you! : )

[Vention3]

ATR's should be pulled from services world-wide. They tried in vain to copy (or even come close) to the Bombardier Dash series, but hey.. failed miserably. The ATR's were pulled from service in Canada during 'winter' months, but were eventually pulled because it was discovered they are USELESS in icing conditions.. I wouldn't fly in one if it were the only plane left on earth, thanks! Cool vid, though!

[toy2day]

@Vention3 I've flewn 100s of times with ATRs, and for Greece's conditions are excellent!! Even as a passenger, it feels great. Safety record is impeccable (all accidents were human error) unlike the DASHs which have many technical problems (latest was the main gear failures in Sweden and Denmark). These are nice planes as well though but I trust the robust ATR more!!

[itapirkanmaa]

@Vention3 The companies who use them in Finland are very happy with the dispatch rate, I've not heard of any icing-related problems here either. The ATR has been in use in Finland since 1986 -- that is 25 years already.

[FiveCentsPlease]

It's called image aliasing and it is related to how cameras capture images of fast-moving objects and it can lead to motion effects. See also: propeller aliasing. See also: wagon-wheel effect

[Ickglaubeshackt]

He's the man! Check it out! :D LOL! /watch?v=HBtIlTGJ_mA

[misterbonzai08]

Looks like a plasma weapon to me!

[quigley257]

It is known as "rolling shutter effect" caused by the way the camera(usually cell phone cameras) capture the image.

[RenderNan]

@quigley257

You're right.

[digitalbroadcaster]

Nothing to do with feathering, but simply as others have mentioned, the refresh rate of the camcorder chip isn't fast enough to allow it to look normal. If you changed the shutter speed on the camcorder, this effect would disappear or become even more diverse.

I film aircraft from helicopters and see this on our witness camera rather than our HD broadcast one.

[Anvilshock]

how it works: v=T055cp-JFUA

[Puma2113]

Prop blades on the ATR are composite, so they flex quite a bit when they start producing forward thrust, same way a helicopter's blades appear to 'cone' as collective is increased.

[cageordie]

This is about how the electronics scan the image sensor rather than about what shape the propeller blade actually is. I used to have to compensate for these effects when I was image processing infrared images in missile guidance systems.

[Flyglobespan93]

This is not a feathered prop, It is something to do with your cam corder, feather is only if an engine shuts down in mid flight then they feather the prop, not on the tarmac!

[Puma2113]

@Flyglobespan93 Props are feathered quite often on the ramp to keep the wind from spinning them. Especially with the ATR, since the prop isn't mechanically connected to the turbine, the prop weathervanes pretty easily.

[ca11um15]

You only feather the blades in an engine failure, so they are parallel to the relative airflow. The blades are changed to fine pitch (more or less the opposite of feathering) to allow better acceleration for take off, not to reduce drag. That's the change you see in the video. Pretty awesome effect!!

[BigFatLoserDude]

Frame rate distortion

[eltouristoduo]

so depressing when people post thier utter ignorance and fantasy explanations.

Not really that funny if they were joking and unfortunately they usually arent.

Too dumb to even keep the looniness to themselves. I dont know which is dumber saying the glass causes it or that the prop is actually bending.

[skazhiprivet]

The bending effect is due to the camera, not the propeller. Feathering changes the angle of the blade... but it doesn´t BEND the blade! :-P

[Jordan92rocks]

rolling shutter effect. caused by your camera

[GatwickSpotting]

This is the rolling shutter from a CMOS based camera.

[OverTaxed42Long]

If you look at pictures of prop driven planes you can tell if the engine was either not running, stalled, or had throttle applied. In those crash pics the plane under throttle will have blades bent forward when it hits the ground. When it hits, they freeze in that position. When you land safe they bend back to normal.

[OverTaxed42Long]

When a propeller is under load or rather the engine is transferring thrust to the propeller in order to allow the airplane to fly, what happens is the propeller wants to move forward much faster than the plane can move to keep up with it. Therefore you get what you see here, the blades of the propeller flex forward.

[bigtoyota479]

@OverTaxed42Long HAHAHA! Such a troll. Unless you truly believe this is true.....

[OverTaxed42Long]

@bigtoyota479 troll? try correct. Or right. Or educated. Or licensed to work on anything that flies. Both airframe and powerplant.

[krakerstaker]

@OverTaxed42Long YOUR RETARDED

[OverTaxed42Long]

@krakerstaker dumbshit I'm an A&P mechanic. Go learn something and you'll see what a retard you are. I'm right, I know I'm right and I will always be right about why the blades of the prop are bending forward like they are. Did you even look at any crashed prop driven planes and notice the ones that had the throttle applied at impact all have the tips of their props bent forward? Or the ones that crashed with a stalled engine had theirs bent back? Jerk wad.Get an education or shut up stupid.

[brooklynlulu]

nice and trippy lol.

[CJCA915]

It's called the stroboscopic effect.

[Tavio006]

put u hand in it do

[euonomous]

I like the strong tailwind explanation!

The effect is what's called barrell distortion. The window glass itself has a concave element to give the passenger a wider angle view. Your vantage point framed the prop. tips right at the corner where the apex of the curve would be. The window acts like a "lens baby".

[inlesrockstar]

i've been on an AE atr 72 but they didn't bend that much

[davo311066]

what you see on the video is an optical effect, the propeller bends and twits during operation but not at those limits.

[Richard19706]

they dont really bend like that idoit.....

[stuckinadazzee]

I think it's just a cheap chinese plane

[chueffer]

It was a cheap plastic Chinese propeller.

[a4ol]

@chueffer

It was his camera . maybe it was a cheap Chinese camera

[Gerrit22041992]

haha lol

[chenming863]

@chueffer , it's composite propeller you idiot, it allow some sort of bending during the engine running.

[365ways]

@chueffer check out THRUST BENDING FORCE OF AIRCRAFT PROPELLERS

[360T5R]

It is normal for propeller to curve... It is how the principle goes... The more the propeller curves (or Bend) the more it bites the air... Thats why most propellers are twisted and not design to be straight because it is applied in Aerodynamic principle just like an airfoil... :)

[a4ol]

@360T5R

lol

[360T5R]

If you wanna know why the Propeller bends during its rotation is because it "bites" the air creating this propeller to bend which is normal... The bending motion of the propeller creates thrust... And so thats why most propellers are twisted so that it scoops the air... The twisted design of propeller helps aircraft to gain thrust in mid air thats why it is bending... Most Turbo Prop and Reciprocating engine has the same operation of propeller bending...

[sabaqat]

it's because of the frequency of the propeller and the frequency of the shutter

[manhill]

it has to do with how the camera records. the camera is not taking a picture at a time, it`s "scanning" a picture. hard to explain, but you would not have this effect with a better camera.

[Thomtom701]

@manhill That's the same when you take a photo with a numeric camera. The propeller appears in (quite) horizontal strips because of the scanning.

Isn't it?

[365ways]

@manhill or maybe its due to :Forces acting on a propeller

Thrust bending force

Thrust loads on the blades act to bend them forwards, opposite to the direction of flight.

quoted from wikipedia

[smartycummins2500]

@manhill actually what a lot of people don't know is the propeller bends forward while accelerating. The tips lean forward because the farther away you get from the base of the propeller, the weaker the propeller blades are. It only does this when accelerating because it basically grabbing the air thus causing the tips to bend forward. This is normal so don't worry they are designed to handle this haha

[DerKauz402]

naaaaah.... if a prop would be so bendable, the plane wouldnt be able to take off

[Takkie32]

As manhill says. So it's kind of slow motion. And now you can see what the effect on the prop is. Wich you wouldn't be able to see on a better cam. Friend of mine is a aviation technician and he told me i was right ;)

[bajesus666]

ur fucking retarded

[waszak1977]

dude...thats just due to the plane using organic fuel man..just sit back smoke some weed and think about it..... way out man! bend for me baby! bend!

[Cielzerozx004]

sheesh..... its just Aliasing..........

[bokanist]

This is due to CMOS sensor in the camera.

This effect is called "rolling shutter".

[alexkrause]

aliasing still applies to video....

wow you guys are dumb

[DanTheCaptain]

sometimes it because one of the engines isn't on at landing and other times its because there starting the engines. in turbofan air craft the leave the engines on

[berzobe]

So what is so strange about it...i can do the same with my cooling fan in my bedroom...it has nothing to do with propeller...it is only because of the way camera records...there is aliasing involved...just like when it seems the tire of an automobile goes backwards...try it with your fan at home and camera on your cell.

[jaminhims]

Works :)

[1moredayof]

Now they've gone and done it. To save money they're using those cheap plastic propellers.

[ANTROS19]

i hope u dont mean it

[crazyfucker123321]

if you look at the video at the bottom part of the propeller in the middle it looks like its disapearing then comming back at the top. its a computer effect. this is stupid.

[greekozzi]

where were you headed to?

[toy2day]

To Samos island!!

[fsxelal]

The turning/shifting of the prop blades is called "feathering." It is done on ATR aircraft to reduce drag.

[toy2day]

thanks, correct!!!

[fsxelal]

no problem!

[sendmedem]

the plane doesn't feather blades on the ground! Feathering is only done when you lose power to one engine, yes to reduce drag in flight,

what you see on the video is the frame rate not keeping up with our eyes frame rate. sometimes seen in movies.

[DonBringer]

@fsxelal thxfor the information! because i am taking AMT course

[KimmurielBaenre]

@fsxelal Nearly all turboprop and even some piston planes have full feather props on them, it allows the prop sweep to be optimized based on power and flight conditions. It has nothing to do with drag.

[rossoarancione]

@KimmurielBaenre Well, not exactly. If an engine fails during flight, prop blades will be feathered to reduce drag.

[OverTaxed42Long]

@rossoarancione Wrong. Props are feathered during full throttle at altitude to reduce drag caused by the prop. Think about it. If you try flying an airplane with a propeller without allowing the propeller to feather to reduce the drag it would encounter if left flat facing foward(unfeathered) in flight, it would drastically reduce your airspeed.

[rossoarancione]

@OverTaxed42Long : You've got it all wrong. You would only INCREASE the drag on the prop, thus stalling the blades and making them pretty useless. At full throttle, Full pitch (minimum angle of attack) is used. Look it up.

[365ways]

@KimmurielBaenre actually it has everything to do with drag.

when you feather a blade its allows it to be ALMOST 90 degrees with the relative airflow.

you only feather a blade after an engine has failed, to reduce drag that reduces directional stability and increases fuel burn, also increasing load factor that increases stalling speed

hey you dont have to believe me, read up in wiki :blade pitch or pick up a POF manual

[scottys55]

@fsxelal The Beechcraft B1900D also has a feathering feature.

[DG121480]

Strong tail wind.

[MozTS]

its' the illuminati and the zionists

[koringeo]

that is a turbo prop!!!

[hrafn2k]

A lot cell phones have no physical shutter and instead use photon gating on its CMOS sensor. Some parts of the image are recorded before others, much like with a scanner. The phone's CMOS scanner seems to be a lot slower than, say, the CMOS sensor on your Canon point and shoot camera. Therefore, as the camera is recording the image, any changes over that small but significant amount of time are recorded.

[mattyohe]

nice copypasta

[hrafn2k]

:hf:

[koringeo]

yep your right!! its not the prop its the camera.

what fool the camera also is that thats not your conventional prop. Its a turbo prop.

[tbmavengerstuka]

i undertand the side bending due to picture capture, but I don't undertsand why they bend forward so much. it seemd like it was close to 90 degrees, and as a pilot myself, I know blades don't bend that much forward. So again, how is it that the camera is even capturing the prop's blade in that area which i so far forward of the propeller's plane of rotation.

[toy2day]

Exactly that I cannot explain!!! While I was in the plane, this bending wasn't so clearly visible, so I assume it's the camera that made it happen

[gastonyt]

oh my.. ive flown atr-42's and ive never seen that effect. lot of frames i suppose.

[toy2day]

not frame ratio, as if you see, the background is not blurry.

[ragemanchoo82]

These blades adjust, dont they? The slant of them, I mean.

[fangus503]

the wonder of frame rates

[stockhus]

W??

[tahrqa]

The blades not bending at all (maybe a little but you should not observe it). It is only an optical illusion. Try at the beginning of the engine start to pause the video but so that you can see one propeller pointing towards (vertically) you. It looks like it is bend forward. The camera can take only about 30 fps but the propeller rotates faster. So the camera captivates only few of the angles of the propeller (at a certain propeller speed, those witch look bend forward).

[tombow1234]

That's normal,that blade is probably an A12ZX with forward end curvature.The propeller try to move the plane and the tip of the propeller have cinetic properties that make it bend(only few cms)to front cos is stopped and dont have enough wind velocity yet. Visually is more impressive cos the speed, see at 0:57, the down blade is almost perpendicular to the rotor. Im aeronautics engineer,if the blade dont have this property, when the air flux and pressure changes too fast the blade would brk

[fangus503]

thats some serious bullcrap. if the propellers bent forward that much, efficient airfoil effect would not be achieved. the propellers would be so flexible, that they would only bend forward, thus not moving the plane due to no thrust because the propeller cannot "push" air backwards. it is simply caused by the low frame rate of the camera.

[tombow1234]

Im not arguing about the propeller direction, i know that is a visual effect cos the propeller goes faster than our eyes preception (or the camera frame ratio), im talking about the blade curvature. kayjakk is obvious that you have no idea about Fluids Mechanics.Back to school boy, Fangus503 "propellers bent forward that much"??? Only few cms, that reduces the impulse force only few Kp, not enough to stop a plane up of 70% of engine power, that plane is at roll speed about 15 or 17%

[relativeair]

your an idiot!

[kayjakk]

No, actually HE is right, and YOU are an idiot. (A bit like tombow, who claims to be an engineer, and can't even spell "Kinetic" right...)

You get the same effect filming a wheel in motion, where it appears to stop rotating and/or reverses direction whilst the car/bike is moving forwards.

The apparent "bending" can be both the overlapping of the propeller blades (blocking part of it from view), and/or the contours of the edge of the window it was being filmed through distorting the picture.

[relativeair]

oh no your the idiot! i was referring to the propellers bending as tombow stated not the effect of the camera! so before you go on and try to make yourself sound like the intelligent one here, my comment was replying to tombow and agreeing with fangus! idiot!

[kayjakk]

Abusive moron.

[DionysiosA76]

pou taxideves?

[toy2day]

de thymamai, synexeia mesa se ena ATR eimai, logw douleias sta nhsia. Pantws auto prepei na htan pros Samo, h Kythira

[DionysiosA76]

a edexi, yiati perno ena tetio aeroplano sthn Kefalonia apo Athina

[cxon]

Interference!

[NorcrossMedia]

It's the shutter speed.

[PilotOfNorway91]

Interference is waves dude. Building upon each other; it took down Tacoma Bridge back in 41 I think. I know the effect, but I can't be concrete with the real cause. I've seen it on other props too.

[kyrirhcp]

Thrust bending force. The propellers are trying to pull the plane forward but cant because its got its breaks on, the propellers therefore are trying to move forward so they bend outwards. this is compensated for by companies that make the propellers, completely normal

[bencaldwell08]

it looks well nice when they bend anyways

[F16wannabe]

Its just the camera, I fly turboprops and thats what happens when you have a slow shutter for video.

[Pokcetmon]

that looks so fake but cool

[Skunkoworks]

prob the camera or a serious case of thrust bending force.

[ComradeLynx]

Hah really funny :DD

[ATRpilot00]

oute ofthalmapati einai,oute i kamera ftaiei(an to parakseno den einai ta frames tou kinitou alla ta blades)..

sta atr sto condition lever yparxoun 4 epiloges: 1)fuel cut off,2)FTR,3)AUTO,4)100%

otan ta levers einai se FTR(2),ta blades gyrizoun etsi wste i kinisi tous na mi dinei thrust alla drag...diladi me full throttle kai epilogi FTR,to aeroskafos epivradinei..me apli fysiki o kathenas katalavainei(ta blades kanonika einai liigo gyrismena gia na dinoun thrust..twra apla ''xtypan'' ton aera

[toy2day]

Ναι, αλλά όταν το έβλεπα με τα ίδια μου τα μάτια, δε μου φαινόταν τόσο μεγάλη η καμπύλη!! Πάντως ευχαριστώ πολύ για την εξήγηση!!

[ATRpilot00]

oute ofthalmapati einai,oute i kamera ftaiei(an to parakseno den einai ta frames tou kinitou alla ta blades)..

sta atr sto condition lever yparxoun 4 epiloges: 1)fuel cut off,2)FTR,3)AUTO,4)100%

otan ta levers einai se FTR(2),ta blades gyrizoun etsi wste i kinisi tous na mi dinei thrust alla drag...diladi me full throttle kai epilogi FTR,to aeroskafos epivradinei..me apli fysiki o kathenas katalavainei(ta blades kanonika einai liigo gyrismena gia na dinoun thrust..twra apla ''xtypan'' ton aera

[LeonSzillard]

Amazing.

can only be due to a shutter effect - each frame of the video actually 'begins' at the left and ends on the right. Hence the distortion.

[sxyoda]

ofthalmapath einai

[toy2day]

Φαντάζομαι πως ναι, αν και όταν παρατηρούσα την LCD οθονίτσα ήταν και εκεί ορατό! Υπάρχει και σε διάφορα αλλα βίντεο στο youtube αν δεις!

[sxyoda]

ma nai to mati kanei trela pexnidia....eidika otan h taxytites antikimenon ayxanonte

[Irvine5312x6ma]

Ναι είναι παράξενο και ωραίο ταυτόχρονα! Τυχερός ήσουν που είχες θέση δίπλα στη μηχανή...

[toy2day]

nai, tha ksanampo syntoma se ATR elpizo na exo thn kanonikh kamera mazi mou..

[Irvine5312x6ma]

Roger!!! :)

[Irvine5312x6ma]

What's strange with that? It's just the guy's camera that shows the prop turning effect like that! My mobile phone does this also when I take videos! Στα ελληνικά: Τί το περίεργο έχει καλέ αυτό? Και το κινητό μου (W700i) έτσι δείχνει τις προπέλες των αεροπλάνων! Έτσι δείχνει το εφέ η κάμερα αυτουνού που τράβηξε το βίντεο! :)

[toy2day]

I think it's the camera, but it's still very impressive, isn't it?

[michailovits]

καλό!

[fschaoswolf]

nice,:D