BA-609 Tilt Rotor tests at Ulrichen, Switzerland
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- čas přidán 17. 07. 2011
- In September 2009, a no longer operational Swiss military airfield was used for tests of the BA-609 at higher altitudes. This lengthy video shows ground checks and finally take off. The somewhat unreal impression when the airplane takes off is due to an optical illusion. The rotors seem to slow down when the real speed in the opposite direction actually increases.
- Věda a technologie
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!
Salam
Seriously cool how propeller speed almost matches frames per second huh!
Thanks for this video (all of it)) well worth watching
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).
Wow! That's the first time I've ever seen wingtip vortices from rotor blades. Really cool!
োুুু
the vortex curling off the blades is awesome!
Yeny paola
Zip@@yenytorres4155
@@yenytorres4155 ..p
love the optical illusion at the end, reminded me of other encounters with helios
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!
the1realanalogman giao'thnmới
the1reala
Fantastic video
That's awesome, the wash from the prop blades are visually going backwards.
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.
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.
0
@@subramanisubu12440⁹0
aaa aaa
man war das ein spannendes Video... total aufregend
Thank you this video Amazing
@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.
piebstrains1 thats exactly what the titel says...
those blade tip vortices are so cool i never seen that before!
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.
This flying contraption just looks epic.
I love the frame rate effect on this video with the reverse turning rotors
🐱🔛🐱🔛🔛🔛🔛🔛🔛🔛🔛🐱(/ω＼)╯﹏︶︿╯﹏╰︶︿︶🐱🐱🐱🐱🐱🐱🐱🐱
Is it due to higher frame rate or lower frame rate...??
@@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.
@@idrisali9809 ppopppppp
@@atigerclaw bro was waiting his all life for this
beautiful spotting
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
What is that wierd black line that keeps showing up in the middle????
Love how the frame rate shows the blade vortices
Please could you explain what you mean?
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
Woooow amazing 👍
So unique & so beautiful
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.
MU2 fuselage. Cool. They moved those Garrets out to the tips.
Sadly, this aircraft crashed in October 2015 in Italy near the factory. Both pilots died in the event.
OH shit. I am sorry to hear that. Do they know why it crashed and is there a video or pics of the crash?.
this aircraft doesnt seem to be very stable
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.
The standard Robinson R22 and R44, for starters.
Is this project canceled because of this?
The camera shutter captured those tip vortices perfectly.
00000000
@@thaysbispoaraujo5528 а
Great vid
the illusion of slow rotors is awesome :)
It's not an illusion, the propellers are accessing the sound waves. This is why you can actually see it.
@@dianavance1137 no the aircraft has anty gravity technology these are just Radars
@@dianavance1137 inuit iikiiii
This is so cool. I guess the three guys at the beginning are from the Airports answer to AAA
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.
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
Beautiful aircraft.
Da da da stil. Dav adică decolare si aterizare verticală. Da vă respect cu multă pace din tot sufletul meu.
nice camera frame shutter sync with rotors
Wonderful tecnology
In 1960-70....jet thrusters on gimbal system way newer and safer....🤔🇩🇪🇺🇸👎🏽
What are those ring that looks like born in the tip of the propeller and go to the center?
It´s awesome how the framerate of the camera makes it look like the rotor is turning once every second
but why is the shadow also so slow??
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.
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.
Well duh it is turning
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 !
Looks awesome! :D
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
Muito bom esse Vídeo. Parabéns 👏.
Thank you
Great the way it tilted the rotar to take turn
Nice video😊
"this lengthy video"...lengthy indeed...I have taken a nap in between.
Wow.. Amazing.. 👍👍
An engineering marvel, the plane can even take off when the rotors are spinning in the opposite direction.
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)
The optical illusion comes from the frames per second of the camera. Keep the motors tuned to each other or one side will out balance the other and cause a crash, even when the pitch appears correct. Tricky machines to learn.
New version coming soon i think may be?
How hard is it to fly as compared to a plane or helicopter?
Its been ten years now and still not clear if it already has its ratings approved
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.
7
It's a Shutter Speed Synchronization phenomenon! Not our eyes!
Look I don't know, but the shadows?
@@robertweekley5926 So why then do you observe the same effect with the naked eye?
Superb
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
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.
TheLT ko
Nice video
Cessna 500 nose, PC12 tail, body of a king air, gear of a Bell helicopter, wing of a Meridian, and osprey tilt rotors.
have they given up on this aircraft since the crash ?
Commercial/private conversion of the military Osprey?
that is seriously cool
Amazing
Heavy blades for a small craft. It was an interesting concept but certainly there are more agile and lightweight and safer alternatives now.
Does the optical illusion with the blades have something to do with how many FPS the camera can capture at?
I don't know but it seemed fairly logical :P
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?
Genial .....parabens para todo os projetistas...a inteligencia humana na. Fica devendo nada pra nenhum outro plano
How many licences does the pilot need to have? A chopper licence and fixed-wing one?
7
Manbearpig is real I'm cereal
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.
>>> 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
Can this thing start its engines one at a time?
So good
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?
Que hermoso gracias adiós por la sabiduría que aspermitido a que el hombre pueda de sarrollar sus conocimientos
In my head I keep comparing this to an Osprey and it just looks small.
Yes I know this is not a Osprey.
I would love them hills in the winter and a sled.
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.
@Myrtone Well, I took the video. It would be a bit hard to pilot the craft at the same time.;-) Actually, I just find the technique fascinating to get such an aircraft into the air and safely back down as well.
Hi, why fans appear to be moving very slow.
@@pp1studios868
Propellers
And it's due to the frame rate of the camera
@@StaceyIsles saw a video of a twin engine prop plane with the same effect, but in that it looked like the propellers where stationary, like the engines weren't running.
@@mustang6599
That's some high frame rate
Do you have the links to the video?
@@StaceyIsles www.reddit.com/r/oddlysatisfying/comments/aoikrt/this_plane_taking_off_with_the_propellers/
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.
What about the shadows of the rotor?
They are variable pitch ofc... It's simple, look at the prop spinners, they have cutouts in them. :) Every modern craft except very small civ aircraft has variable pitch propellers to control the load on the engine.
whats the price tag on this beast?
Do you mean engines inside the fuselage?
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)
Same basic idea but a straight wing and the engines don’t tilt but otherwise pretty much the same idea
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.
Carmel Pule' Just change the shutter speed/frame rate...
The engines have actuators on them, that's how it balances the pitch in hover. Are you sure you meant the pitch? :)
The cool thing about CMOS cameras is that you can see the propellers in slow motion without having the feature active.
Is this a prototype? Or an in-service aircraft PreFlight and run up seem excessively long
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
Is it copy of V-22 Osprey?
That cracked me up! :) Thumbs up bro!
The blades are spinning the wrong way it would be pulling it down?
I suggest you read a wikipedia article "Helicopter flight controls" to learn what a governor is.
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.🤭
RC? Red Crucible Firestorm?
I thought it was RC (Radio Controllled) first as well, I recognized the Air strip from the giant sized RC Models video!!!!
Wow!!
128 pirla che mettono pollice verso.....invidiosi che un azienda italiana precisamente del varesotto, e' riuscita a creare questo gioiello tecnologico....
Grazie ai tanti talenti italiani che stanno lavorando a questo magnifico convertiplano
e so pirla davvero
Should the guy be standing under the props while the props are being tested?
isn't only awesomer, IT'S AMAZING
those propellers must be very superior , at 4:50 they spin at just ½ revolution per second , and it still lifts fine
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
I guess if you rotate your propellers backwards slowly enough you can hover, ill have to try that sometime
For one second. I’m like how can it lift itself like that.
@i2sA Frohes Neues Jahr! Mein Sohn kann ein Flugzeug wie einen Hubschrauber Fliegen lassen. Es ist erstaunlich,
Most beautiful