BA-609 Tilt Rotor tests at Ulrichen, Switzerland

[@Dirk80241]

Great to see the tips so clearly at the end, and to realize the rotors are spinning much faster than they seem on the video. Great work!

[@apagla3518]

Salam

[@geraldstahlman7036]

Seriously cool how propeller speed almost matches frames per second huh!

[@77trashman]

What is that wierd black line that keeps showing up in the middle????

[@MiG82au]

All but the simplest planes have variable pitch propellers with a constant speed governor. This is especially important when you are hovering using high inertia rotors because their rotational speed can't change fast enough for good vertical control. The vortices have a low pressure region in the centre that causes the water in the air to condense. It's never compression that causes this, it's always rarefaction (sometimes the result of a compression wave having passed).

[@jetstream454]

Love how the frame rate shows the blade vortices

[@thesisLAx]

Please could you explain what you mean?

[@bigbeartr57]

I love the frame rate effect on this video with the reverse turning rotors

[@idrisali9809]

🐱🔛🐱🔛🔛🔛🔛🔛🔛🔛🔛🐱(/ω＼)╯﹏︶︿╯﹏╰︶︿︶🐱🐱🐱🐱🐱🐱🐱🐱

[@alirehan4021]

Is it due to higher frame rate or lower frame rate...??

[@atigerclaw]

​@@alirehan4021 We can work it out with some assumptions. First, a quick one: Since the blades are 'retreating' instead of advancing, we know that the blades are reaching the same position later and later with each pass, losing the race with the frames the camera is taking. So the camera has a higher frame rate than the blades rotate. But we can take this further. Let's say the camera is recording at the standard rate of 30 frames per second. That means the camera takes an image 30 times every second. It takes, based on a quick eyeball count, about 3 seconds for the blade to 'retreat' all the way around the rotor, or about 90 frames of camera recording. That, conveniently, leaves us with a nice 3:1 ratio. It takes 3 frames for the blades to rotate once. So you get ten rotations in the thirty frames the camera captures. Ten Rotations per second. That's an RPM of 600. Which is pretty inline with how much RPM you want with an engine that big. You don't want 4,000 RPM with blades that large, because the bigger they get, the more stress rotation will put on them. I have it on good authority people generally don't like blades the length of a car snapping off and flying edge-on into nearby bystanders. And you can also get a pretty good idea of RPM ff you listen to the blade slaps. You can distinctly hear how they have a sort of almost-drone to them at a very low pitch. Each engine has three blades going by at ~10 Hz (cycles a second), producing 30 Hz overlapping itself between the two engines. The human ear can hear tones starting around 20 Hz. If you listen to the audio, the blade slaps slip in and out of real sharp 'clippy' noise and a more smooth drone, entirely from the combination of the distance between the two engines from the camera, the wind moving the air, and the turbine exhaust blowing the air.

[@jeanlouispelloux4658]

@@idrisali9809 ppopppppp

[@dumbassgreek]

@@atigerclaw bro was waiting his all life for this

[@the1realanalogman]

Man, it's hard to describe the impression this creates. There's so much power there and yet I everything seems so subtle! For me at least, it is vastly different than watching an Osprey, which seems to always be operating outside its design envelop! Thanks for this cool vid. The scenery is very beautiful!

[@ketnguyen6642]

the1realanalogman giao'thnmới

[@ketnguyen6642]

the1reala

[@piebstrains1]

I tried to show what it takes to get airborne on such test flights. And if you read the description, it prepares you for the fact that you need a bit of patience.

[@subramanisubu1244]

0

[@tanmoydutta7277]

@@subramanisubu12440⁹0

[@l.rolandolupiacr.8535]

aaa aaa

[@RuiPlaneSpotter]

Fantastic video

[@Michael-ss4gy]

man war das ein spannendes Video... total aufregend

[@asagk]

I am wondering how this thing can land, I do not mean crash but land, if there is a single engine failure while at flight. --- I mean, it is obvious, it will crash when in hover mode and an engine fails. But what when flying like a plane and an engine fails. Because of the rotor size it cannot land like a normal airplane, since no high forward flying landing speeds. Is one engine still enough to not crash on a landing strip, or does that mean that in both operation modes, hovering and flying, a crash is inevitable with a single engine failure?

[@BackGround909]

love the optical illusion at the end, reminded me of other encounters with helios

[@MasonCleveland]

the vortex curling off the blades is awesome!

[@yenytorres4155]

Yeny paola

[@เมืองไทยลิสซิ่ง-ฅ7ฝ]

Zip@@yenytorres4155

[@prasannankumar4287]

@@yenytorres4155 ..p

[@bryanrussell6679]

I don't know if it's the camera's speed or the refresh rate of my screen that makes the props look like they're barely turning, but it looks cool. You can also see the little vortices from the tip of the blade.

[@filipipauli]

nice camera frame shutter sync with rotors

[@piebstrains1]

@Afrocanuk: Switzerland has not got anything to do with this aircraft. The Italian company only made use of the high-altitude location in Switzerland for their tests.

[@paulkrimmel6384]

piebstrains1 thats exactly what the titel says...

[@andrewjenery1783]

This is a well-known phenomenon. The increased rpm is high enough that we cannot possibly observe the actual speed of rotation, so we compensate by seeing what seems to be a reduction in speed. These are counter-rotating rotors, one going clockwise and the other anticlockwise.

[@knutgjerse772]

7

[@robertweekley5926]

It's a Shutter Speed Synchronization phenomenon! Not our eyes!

[@BeasleyStreet]

Look I don't know, but the shadows?

[@andrewjenery1783]

@@robertweekley5926 So why then do you observe the same effect with the naked eye?

[@roxximusik8958]

re: Connor Vaughn - I'm in line with your thinking. Just how does the pilot cope with c of g fluctuations whilst in hover mode ? Either there's an incredibly sensitive auto pitch system, or NOBODY'S allowed to visit the john !

[@obliviousfafnir01]

Wow! That's the first time I've ever seen wingtip vortices from rotor blades. Really cool!

[@apagla3518]

োুুু

[@piebstrains1]

Sadly, this aircraft crashed in October 2015 in Italy near the factory. Both pilots died in the event.

[@AviationNut]

OH shit. I am sorry to hear that. Do they know why it crashed and is there a video or pics of the crash?.

[@TheDormonid]

this aircraft doesnt seem to be very stable

[@superskullmaster]

Name one helicopter that is WITHOUT autopilot? Plus it was testing, not flying paying passengers. Most modern fighter jets would fall out of the sky in seconds without the fly-by-wire.

[@Itapirkanmaa2]

The standard Robinson R22 and R44, for starters.

[@inekemateman273]

Is this project canceled because of this?

[@moonshinefuel]

Heavy blades for a small craft. It was an interesting concept but certainly there are more agile and lightweight and safer alternatives now.

[@mrJv2k7]

are those caused by the air reaching supersonic speed? or just compression? i love how you can see the blades change pitch when he takes off... was he taxiing with engines on full rev though? it seems that way since the apparent speed of the blades remains the same after maneouvering into position for take off and the actual take off... only the pitch seems to change

[@alejandroarndtjack4095]

It´s awesome how the framerate of the camera makes it look like the rotor is turning once every second

[@DerNetteFette]

but why is the shadow also so slow??

[@mike_van_in]

If you look at the pitch of the rotors, you'll notice that it's even worse! The rotors look as if they are spinning backwards.

[@mike_van_in]

That's how the frame rate affects what we see. Remember that the camera can't "know" the difference between a solid object and a shadow. It is simply recording an image approximately every 40 milliseconds. The shadow moves at the same speed as the object causing it - since the light is travelling at ... the speed of light. =) The rotors on the AW609 (previously called BA609) turn at 570 rpm in helicopter mode. That means one of the three blades moves into the same space (570 rpm x 3 blades) / 60 seconds = 28.5 times per second - or every 35 milliseconds. Since the frame rate is faster (at these rpm), the image will be captured "earlier", i.e. before a blade is in the same position again. When the difference in time is so small, the "animation" effect will be to show a slow movement - in this case backwards. If the frame rate was slower (by the same amount) than the time taken for a blade to move to the same position as the one preceding it then the motion would appear to be forwards. Some cameras (like the iPhone 6s, Sony and GoPro) and can record at up to 240 fps (frames per second). If the camera recording this aircraft had such high frame rates, then just about any effect could be reproduced by selecting the right frame rate for the desired effect.

[@joescheller6680]

Well duh it is turning

[@mrcannotfindaname]

An engineering marvel, the plane can even take off when the rotors are spinning in the opposite direction.

[@walterbrown8694]

It can, but you'll notice it can only fly backward when the rotors are spinning in that direction. To go forward, the engines have to reverse direction of rotation of their crankshafts, which is quite difficult once the aircraft is flying. (The copilot is quite helpful in that operation, in which precise timing and dexterity of the pilots is extremely critical - simulators are used extensively in this because training for engine reversal in flight using the actual aircraft is extremely hazardous)

[@carlosalbertoespinosaramir2556]

What are those ring that looks like born in the tip of the propeller and go to the center?

[@SmoochyRoo]

The camera shutter captured those tip vortices perfectly.

[@thaysbispoaraujo5528]

00000000

[@ЗарнишанЯрмамедова]

@@thaysbispoaraujo5528 а

[@marculatour6229]

Inhaling exhaust fumes from aircraft will definitely make you super high.

[@MrMilanoLau]

How many licences does the pilot need to have? A chopper licence and fixed-wing one?

[@tonistolevski2555]

7

[@dennism103]

Manbearpig is real I'm cereal

[@abcxyz-nd6xh]

>>> The rotors seem to slow down >>> when the real speed in the opposite direction actually increases. Perhaps due to "resonance" with the video frame rate i.e. the rotor speed might be near multiples of 30fps

[@haroldasraz]

This flying contraption just looks epic.

[@josephastier7421]

4:55 is why you are here.

[@arpandrozario7959]

Saved my time bro

[@kek2045]

Wow to rotor..

[@farerse]

those propellers must be very superior , at 4:50 they spin at just ½ revolution per second , and it still lifts fine

[@rakeshmehrotra8837]

I knew someone would think that .. when i also recorded a plane landing with propellers the same thing happened and the reason is that the camera cant keep up with the high speed of propellers and hence records accoording to its maximum refresh rate.. in real life with human vision its revolving really fast

[@killingfields1424]

Its been ten years now and still not clear if it already has its ratings approved

[@N330AA]

That's awesome, the wash from the prop blades are visually going backwards.

[@michelleendo3626]

I wonder which system is more efficient and better than other, one the system is, like this, rotating engine with propellant part together, or like Bell, rotating propellant part and gear only, the engine part stays.

[@collectionneur111]

Toujours pas en service en 2022 ?

[@johncarold]

This is so cool. I guess the three guys at the beginning are from the Airports answer to AAA

[@tarakjoshi2250]

New version coming soon i think may be?

[@haroldasraz]

How hard is it to fly as compared to a plane or helicopter?

[@delscoville]

I wonder if it has the rotor driveshaft through the wing like the V-22. The reason why the V-22 won the contract was that it can land if a one motor dies. Although it can't keep flying like a helicopter with one engine, it can fly in airplane mode but will be forced to land when the engine goes into vertical mode (the props are too big to land as an airplane)

[@chrissmith7669]

Same basic idea but a straight wing and the engines don’t tilt but otherwise pretty much the same idea

[@liefbrunhilda926]

Cessna 500 nose, PC12 tail, body of a king air, gear of a Bell helicopter, wing of a Meridian, and osprey tilt rotors.

[@carmelpule6954]

At 3:33 the stroboscopic effect of the camera photographic sequence makes the rotors look as if they are rotating the wrong way around in reverse, as that is not a lifting mode in which they APPEAR to rotate. This is an optical illusion that also makes wagon wheels in cowboy films rotate in the reverse direction when moving forward and he could solve this illusion while filming would become a very rich man.

[@erikarneberg11]

Carmel Pule' Just change the shutter speed/frame rate...

[@randallhuston1466]

It's not an optical illusion. It's because the rotation of the props is matching the frame rate of the camera recording the event. Your eyes wouldn't be seeing the rotors as they would be a blur

[@jh5kl]

the illusion of slow rotors is awesome :)

[@dianavance1137]

It's not an illusion, the propellers are accessing the sound waves. This is why you can actually see it.

[@twixxtro]

@@dianavance1137 no the aircraft has anty gravity technology these are just Radars

[@yoharissantos3282]

@@dianavance1137 inuit iikiiii

[@killingfields1424]

Its more of a helicopter than a fixed wing aircraft. You need to get to speed of around 200 knots so that the wing gets lift before the nacelle can be streamlined for cruising speed. To slow down, you need to angle the nacelle a little bit upward like that of a helicopter rotors.

[@chrissmith7669]

I don’t know where you get that. Transition starts around 40kn and is complete by around 80kn when the wing is generating enough lift. You can see it when they do a vertical takeoff off and are fully horizontal by the time they’re halfway down the runway

[@justinsteeves582]

Commercial/private conversion of the military Osprey?

[@remdizzigovic5018]

Ovo su stvari koje ja ne da volim nego jos pre 30 godina sam ih voleo i zeleo bas ovakovi eto doziveh da vidim to i u javnosti.Hvala ti Boze sto si mi moje sne ostvario.

[@Make-Asylums-Great-Again]

In my head I keep comparing this to an Osprey and it just looks small. Yes I know this is not a Osprey.

[@luizsouzasantos6609]

Eu já tava quase chigando. O vídeo inteiro pra começar voar???

[@kontang6656]

4:45 起飛，好似轉得好慢，系假像，有白色圓氣卷。

[@xenothius]

Thanks for this video (all of it)) well worth watching

[@Mr91495osh]

Should the guy be standing under the props while the props are being tested?

[@connorvaughn7968]

One of the most unstable and unperfected aircrafts ever. It takes a very special pilot to not fuck up when flying one of these.

[@alexanderhoward122]

Конвертопланы это поинтереснее, чем вертолёты. Винты у него расположены в чуть разных плоскостях, или мне кажется? И он может ездить по земле как автомобиль, без использования винтовой тяги, за счёт вращения колёс двигателем? Или это просто не видно, как быстро крутятся его винты.

[@theeltea]

The tilting blades (prop pitch) are designed to manage the load on the engine in fixed-wing aircraft. The tiltrotors and helicopters have governor devices to manage this.

[@michaburakowski671]

TheLT ko

[@4schitzangiggles]

The "effect" is due to the rotor RPM nearing the shutter speed of the camera. That is why it seems to slow down, stops and then reverses.

[@szema]

how does this maintain stability with only 2 rotors? why doesn't it slide forward or backward?

[@huydo7512]

2 rotors spinning in the opposite direction i guess

[@szema]

huy do that doesn't really answer my question. that can give stability to avoid spinning right or left, differential thrust avoids tiliting right or left, but I don't know how this doesn't tilt forward or backward.

[@foobar201]

Tamás Szemadám It either has a cyclic pitch mechanism in the nacelles like a helicopter, or it is balanced such that the nose rises when both nacelles tilt forward a bit. I can't say for sure which method this thing uses.

[@BoopSnoot]

With various computer controls, so the pilot really doesn't have to do much. They just deal with a stick and a thrust control lever that is more like an airplane's throttle than a helicopters, and as the aircraft gains forward speed, the computers automatically compensate the angle of the nacelles. And the answer about the raw physics of it is that it has both variable pitch rotors as well as automatic nacelle tilting. The pitch really just controls the amount of thrust delivered primarily, and the balancing act is handled by the angle of the nacelles with relation to the body.

[@foobar201]

So It only has collective pitch?

[@shahriarbinrouf9049]

Is it copy of V-22 Osprey?

[@AlexManfredini]

Is of italian air force ?

[@0MoTheG]

I don't understand how it balances the pitch axis. Does the wing move along the plane? What if they load it, does it not drop its tail?

[@ВикторМашковцев-ж9р]

Можно подсчитать с какой угловой скорость вращаются винты летательного аппарата !

[@milltonfreedman8674]

Does anyone know what the price range is gonna be on one of these?

[@chrissmith7669]

Lol. If ya gotta ask ....

[@gilbertdrieux9983]

..."The rotors seem to slow down when the real speed in the opposite direction actually increases.".... Effet sroboscopique ! ....

[@اليسارياليساري-ج4ر]

نثح1ع1سسهيشحسحححصخبزشثبمنصمك

[@sutedisudarmono9838]

Thank you this video Amazing

[@ciapekmoj8988]

Why don’t they show flying? And how fast ! 🤔

[@doncangrejo]

¿No es la misma nave con que se reemplazó al Blackhawk pero en versión experimental?

[@cardashcamview9044]

why rotors are slow???

[@gnb2026]

So unique & so beautiful

[@MrDenniski]

That optical illusion is called the rolling shutter effect. its caused by the inter-meshing of the frame-rate and the RPM of the propeller.

[@BeasleyStreet]

What about the shadows of the rotor?

[@SuperIwatch]

Can this thing start its engines one at a time?

[@splendensregan5270]

What if one motor fails?

[@SargeRho]

They could, but it wouldn't be cheaper. On a sidenote, the engines are connected with eachother, so when one fails, the other one keeps both rotors spinning.

[@hkk92]

V22ospray??

[@seanmasters6383]

The blades are spinning the wrong way it would be pulling it down?

[@albertoramonacosta1212]

Cuando va despegar estoy esperando un buen diseno

[@haroldpearson6025]

Why dont digital cameras show actual rotor speed?

[@julioaldanapalma5784]

Wonderful tecnology

[@rudyho3790]

In 1960-70....jet thrusters on gimbal system way newer and safer....🤔🇩🇪🇺🇸👎🏽

[@frogsin7850]

have they given up on this aircraft since the crash ?

[@Infidel7153]

This is a remarkable aircraft it will save countless lives when its put into the SAR role only question is how does the coast guard afford such a pricey toy .

[@hello_work]

Это слишком не надёжно. Большая вероятность аварии, данный аппарат может использоваться только в военных целял.

[@chrissmith7669]

@@hello_workit’s not unreliable at all. Osprey has a safety record equal to most other helicopters. The price won’t be that outrageous

[@bartybum]

Do you mean engines inside the fuselage?

[@welcometowilloshouseregula7171]

5:13 | can see shockwaves. And by the way the rotors sound like an H145

[@paulbarbet4613]

Does it only go up and down

[@girishthakar1561]

Jayshrikrisaana

[@erikarneberg11]

Paul Barbet No, it also goes round and round...

[@jlcreations9990]

The cool thing about CMOS cameras is that you can see the propellers in slow motion without having the feature active.

[@charlesgstockmeister8128]

Is this a prototype? Or an in-service aircraft PreFlight and run up seem excessively long

[@charlesgstockmeister8128]

If it can't get in the air it'll just be a flaming hulk on the ground. Short take off applies to time as well as space

[@TFOKillSwitch]

is she modeled after the us offspra. or how ever ya spell it lol

[@paulachapel2269]

Osprey?

[@rubentorrespina9188]

No. The Osprey was derived from the XV-15. The '609 is supposed to be the production version of the XV-15, so this is an earlier generation aircraft.

[@craigc6769]

Your shutter speed is the source of the slow motion rotors. Try experimenting with that as it makes a significant difference in the end product. It's a shame that opportunity to film this aircraft in a realistic manner was lost.

[@piebstrains1]

@BA609tiltrotor Thanks for the flowers, glad you like the video. I would have loved to see the transition too. But they seemed to just be interested in the hover position under the relative high altitude conditions. They later moved back and forth over the runway without ever doing more than just a slight tilt of the engines as seen here on the ground. And they did not want to have much wind for the tests either, probably to standardise measurements.

[@garyanddebwi2857]

MU2 fuselage. Cool. They moved those Garrets out to the tips.

[@satosantosaitosan]

Osprey's brother.

[@StaceyIsles]

No the v-280 valor is the brother of the osprey This is more a child of both

[@enzogalli2762]

AW609 twin-engined tiltrotor prototype number 2 crashed and burst into flames near Santhià, Italy during high speed trials. Both occupants, one talian and one US test pilot, died in the crash. 30 oct 2015

[@pbansal23]

Great the way it tilted the rotar to take turn

[@oscarzt1652]

those blade tip vortices are so cool i never seen that before!

[@killingfields1424]

Still no news on its FAA rating since 2008. Will this really gets a go signal for production or just a fantasy.

[@prathibhayr6594]

Nice video😊

[@RodrigoAlves-yr1ct]

isn't only awesomer, IT'S AMAZING

[@madhubantimukherjee8138]

Woooow amazing 👍

[@tonywilliams3253]

OMG this video was in the RC Model airplanes list. And when I saw the taxi guy walk around the airplane, I thought all this was RC operated.🤭

[@wodzimiezlenin961]

RC? Red Crucible Firestorm?

[@MyronDYoder]

I thought it was RC (Radio Controllled) first as well, I recognized the Air strip from the giant sized RC Models video!!!! Wow!!

[@theeltea]

I suggest you read a wikipedia article "Helicopter flight controls" to learn what a governor is.

[@RcAddict88]

i love flying these in my sim games they are just so awesome to fly and its hard dont get me wrong but the feeling after u land is just so saticfying :D

[@okrajoe]

Beautiful aircraft.

[@0MoTheG]

Yes, I meant the pitch of the plane. It must have cyclical control like a helicopter. It must have collective too, because the turbine would not be responsive enough.