Building World’s Most Advanced Rescue Helicopters | Ultimate Processes | Free Documentary

we live in a fast-moving world all around us the most extraordinary processes [Music] with access to some of the most fascinating factories i take you behind the scenes to reveal their production secrets from craft workshops to international industries [Music] join me francesca quirando as we explore the world's ultimate processes [Music] this show is all about a mind-blowing machine that's certainly got me in a spin [Music] [Music] hold on tight because in this episode we've taken to the skies [Music] if you hadn't guessed we're following helicopters this is my first time aboard one of these machines and it's really caught me by surprise i'm absolutely amazed at how smooth this helicopter is we took off and you could barely even tell that we've lifted off the ground flying along it's like you're gliding and you can see all the way to the horizon it's a reaction test pilot mark bernand is used to people imagine uh helicopters like some sort of egg pizza vibrating away and whirring but we spent a lot of time tuning these aircraft working on the vibrations to get as low as possible so for this aircraft corporate helicopters are not just smooth they're also extremely maneuverable with no need for a runway they are fast but don't need huge amounts of space that's just the normal reverse direction that is so much fun whether saving lives fighting on the front line or even reporting the news there's nothing they can't do and many of them start life right here below me is the augusta westland facility in somerset in the uk for over a century augusta westland designed and built some of the world's finest aircraft from the luxury corporate helicopter that i'm flying in today to the world famous seeking and many others but enough sightseeing i'm here to investigate the process of designing and building a brand new cutting-edge helicopter and its mission is simple to save lives is the very latest in search and rescue machine today aerospace experts leonardo are the manufacturers of augusta westland choppers and now they face one of the most exciting and challenging commissions of their history [Music] norway has ordered 16 all-weather search and rescue helicopters saving lives in extreme conditions calls for a very special machine it needs to be armed to the teeth with technology it's the augusta westland 101 the 101 is an awesome 15.6 ton beast designed to be the ultimate search and rescue machine one of the fastest military choppers on earth with a top speed of 309 kilometers per hour it's armed with five rotor blades and kitted out with the latest in aviation technology a gearbox that can run without oil for over a hundred kilometers the most advanced electronic radar on earth and three insanely powerful engines in my close encounter with this cutting-edge craft i will be checking out the incredible engineering looking into the painstakingly perfect processes i'll find out about the crucial high-tech systems when visibility is next to nothing they'll save lives investigate the science behind how this helicopter can actually fly that's the easy bit going up and down and i'll even take one for a spin i crashed it we'll follow the aw 101 from factory floor to the very first flight so buckle up because this show is about to take off [Music] the aw 101 begins live here a 4 200 square meter workshop called the final assembly line in here are nearly all the pieces needed to build 16 identical giant jigsaw puzzles tens of thousands of individual components waiting to be put together panels wires gears and engines assembly manager david collings oversees this complex task how many edgy one-on-ones can you build at any one time in here through this facility we can have around seven aircraft at different stages of build the aircraft is built over a six-month lead time the aircraft progresses through the various build stages and they normally move through the various stages around one every four weeks first up stage one the aw101 starts out as thousands of parts they're manufactured in the uk italy poland and portugal then assembled into modules here in yeovil to form the basic shell made from aluminium alloy kevlar and composites the fuselage is lightweight and damage resistant once the shell is constructed it's on to stage two [Music] here's where the fiddly work begins the fuselage is fitted out with the fuel system this allows the 101 to fly a distance of 1 363 kilometers on standard tanks of fuel alone the engineers are also fitting fire detection and suppression systems as well as the hydraulics this stage of construction is surprisingly dangerous if tools are accidentally left behind a real-life spanner in the works the results can be deadly engineer terry white keeps everything firmly under control can you tell me a little bit about this process this is tool control and it does what it says it controls the tools onto and off the aircraft can you explain to me how it works yes the tool control works on a tally system each operator has his own tallies the operator will remove his tally goes to a draw he takes the tool he requires he puts the tally in there and then take the tool onto the aircraft use it when he's finished with the tool brings it back we place it in his position and replaces his tally why is this important if they don't follow this process the tool could get left on there the tool then fell into flying controls it would cause a catastrophic effect on the aircraft the aircraft would go down and you could even have a loss of life so it's very serious very serious duty of care of the customer we have [Music] with all the tools accounted for the engineers push on to stage three now the aircraft is really starting to come together the curved cockpit screen is attached and locked into place underneath the body wheels are being set in motion landing gear is fitted and tested a single pair up front and two pairs towards the rear but the real magic is taking place up top getting up high on the scaffolding surrounding these giant machines gives you a great sense of scale from up here you get a real sense of how massive the aw101 really is it stands over six and a half meters high and is nearly 23 meters long i'm here on the aw 101 assembly line where specialist parts from all over the world are being painstakingly put together here they're in the process of fitting the three engines every one of these can deliver up to 2 500 horsepower added together that's around 60 times the power of an average car engine this triple engine system is the beating heart of the beast the source of all its mighty muscle but how does such raw engine power actually drive these machines [Music] all helicopters are exceedingly powerful their speed and maneuverability can take your breath away [Music] the engines are turboshaft which means their power output drives rotors instead of generating thrust like in an airplane but with this much power driving delicate fragile blades comes a tricky engineering problem take the aw101 when the engines are fully fired up they run at 20 872 revs per minute yet the roses must spin at just 214 rpm or they will totally self-destruct how do you reduce that power this is the answer a gearbox not just any old gearbox but one that can keep a chopper in the air when the oils run dry for a whole 30 minutes now that's clever the gearbox is built not in yeovil but in the sunny climes of caschina costa in italy for the designers conceiving such a complex bit of kits also known as the transmission is a tough task the first challenge is to handle the massive deceleration between engine and blades it's a huge speed reduction we are speaking about 100 times lower than the engine intake and they do that by using gears these gears progressively slow the machine motion down in four stages it's important the gearbox can run dry with no oil for at least 30 minutes it means the 101 can fly long range search and rescue missions as safely as possible the solution is to use special materials specifically heat resistant steels and ceramics what we use is of course specific materials steel materials high resistant in terms of temperature because of course when we take off the lubricant from the major boxer you can imagine the temperature can go up to more than 200 degrees of temperature the gears are cut from steel then shaved ground and polished on computer controlled gear grinding machines the gears are then meshed together and tested using a coloured powder this enables the engineer to work out how close the contact is between them next they're taken to quality control and checked using lasers capable of measuring down to the micron each part must be precisely engineered to within a few thousands of a millimeter less than the width of a human hair once the parts are checked and passed the transmission is assembled they're then fitted into the casing and inspected finally it's time to put the whole thing to the test engineers move the 850 kilogram gearbox from the factory floor to the test bed on a specially designed cart it's the moment of truth can the gearbox really run without oil for 30 minutes without bursting into flames the answer is yes proven practically perfect this transmission is now ready to be shipped to the uk back in yeovil they're putting the finishing touches to the chopper's power system gears check engines check driveshaft check looks like there's only one thing missing the helicopter's crowning glory the blades [Music] they are the defining feature of every helicopter mounted on a top rotor the aircraft can have anything from two to eight blades whatever the number is the blades that are the secrets of this versatile vehicle's success helicopters can do so many things that airplanes can't they can take off and land vertically they can hover fly sideways and zigzag totally maneuverable the one drawback is their speed they simply cannot fly as fast as a fixed wing aircraft and in search and rescue situations when every second counts speed is of the essence that's why the blades of the aw101 have been specifically engineered to fly really really fast when trying to fly at high speeds helicopters are usually hampered by huge amounts of drag and vibration yet the 101 is one of the fastest military helicopters on earth with a cruising speed of 200 kilometers per hour and a top speed of 309 [Music] its nippy nature is all thanks to the blades lightweight composition and their unique angled shape richard porter explains the clever people up in the engineering department came up with this design to improve the performance out of the blade okay now what we're trying to do is we're trying to lift as much as we possibly can with the set length of blade at the tip of the blade we're almost hitting supersonic speeds okay so very fast tip speed we're looking at lift we're looking at speed and also vibration as well is key to the performance of the blade the less vibration you get the less wear you get on the airframe greater ability to control the aircraft by the pilots as well the rotor turns three and a half times per second with each blade eight meters long the tips are traveling incredibly fast as the helicopter flies forward they reach near supersonic speeds of over a thousand kilometers per hour can you explain to me what the blades are made of the 101 main rotor blade made out of carbon fiber yep we have a foam core and the no mux honeycomb training edge okay so this is the spar of the blade this is the main component within the blade so it's carrying the weight of the aircraft this structural foam gives the blade its shape we then bond onto the back this training edge structure it's our nomex honeycomb core and two skins to complete the blade nomex is a lightweight material which replaces the old heavy and weak aluminium cores how does this relate to a full blade where is this so you'd imagine this sits in this direction okay okay yep so we have running through the length of the blade that foam spot foams bar we have no mexican to create the shape of the blade all of this and this is what we call our burp tip this anhedral shape berp stands for british experimental rotor program the mission of this 30 year long scheme was to design the most aerodynamically efficient blade the result this angled paddle shape which allows air to flow over and around the wingtip with exceptional smoothness the blades also have a hidden secret a gadget to help with the worst kind of weather one of the biggest dangers a helicopter pilot can face is ice when ice builds up on the blades it adds extra weight and changes their shape the rotor can't spin as fast and this could trigger a catastrophic crash but the aw101 has to be able to function in conditions well below zero and that's why they come equipped with a very clever feature this is an electronic de-icing system electric wires encased in a plastic shield like a solid electric blanket it's simple but this modest device allows the helicopter to fly in conditions as low as -40. so when the aircraft is flying in conditions which are below zero the pilot can switch on the de-icing system the heater mat will obviously heat the blade heat the erosion shield and melt in the ice which is on the front of the blade in the blades manufacturing facility engineers are assembling a wing skins have been forged from strong durable carbon fiber the bottom skin is laid into a mold called a press tool now the long foam spa complete with hidden heat mat and titanium metal edging is craned in on top finally the honeycomb wedge and topskin complete the wing the tool is then closed and loaded into a press all in all it takes a total of 25 and a quarter hours of carefully controlled heat and pressure to forge a fully formed blade engineers now fit a cover called a fairing to the blade this will house and protect the wiring for the de-icing system next the blades are taken to be balanced this means checking the weight distribution and center of gravity to ensure the blades are poised and stable the first step is to screw tiny weights into the wing tip each blade should weigh in at 128 kilograms and must be identically balanced uneven blades cause severe vibration and can be very dangerous finally the blades balance is put to the test they're fitted 20 meters above the ground atop an extraordinary outdoor facility called the world tower from the safety of a control room engineers drive them faster reaching a rate of around 200 revolutions per minute if one comes loose right now i'm not entirely convinced these nets are going to stop it [Music] luckily they're perfectly balanced [Music] there's no question these blades are incredibly powerful yet the 101 weighs 15.6 tons what's the science behind how these blades lift a helicopter into the air ted could you tell me what this is right well this is a model which is designed to show people how a helicopter works very very simply what we have are two rotor blades here all right and the rotor blades are what generates the lift that is the force that actually lifts the helicopter up off the ground lift is generated when blades spin they force the air beneath the blades downwards which propels or lifts the chopper upwards and so we now have to make sure that these things can generate this lift in variable amounts because we want to be able to go up and down okay and so the way in which we do that we have two controls for the pilot first of all we have this one here which is a collective control the collective control moves a metal ring the swashplate which raises and lowers the blades as second control the cyclic tilts the swashplate this moves the rotors back and forth and side to side so i need to centralize everything up and then we'll just switch it on if you're standing here standing well back for a moment okay so here we are now first of all we're going to do collective now with the collective we're going to raise both rotor blades at the same time now you can't actually see much happening but what you can tell is that it's slowing down and that's because it's using more power because it's pushing down more air in a helicopter as the collective raises the rotors more lift is generated driving the aircraft upwards all right and so when i lower the collective again you'll see it will speed up on a real helicopter we don't allow it to slow down and speed up like that our engines will alter the power to compensate so that's collected now we've got our cyclic and now you'll see if i push this in the same direction as before in the forward direction you'll see it goes down on this side it's gone up on that side which means now we're in that position the column of air which was previously being pushed directly down is now being pushed back at an angle okay so we can go in the opposite direction there so now our column of air is coming this way and our helicopter will be flying that way and now if i move it over this way you can probably feel the breeze coming over your side because now the column of air is being pushed at an angle it's amazing that this simple control system just a few levers directing currents of air is behind the maneuverability of these an extension of machines really few vehicles can move in three dimensions with such ease no wonder pilots love it first time i flew a helicopter it still kind of blows me away and still gives me a great buzz just moving myself three-dimensionally through the environment because going sideways backwards turning around you know just putting the aircraft where you want to uh you know for a search and rescue only got to that could be putting yourself on a mountain peak somewhere just hovering yeah and positioning where you need to be to get survivors up uh yeah you know it's a great feeling we've discovered the simple secrets behind how a helicopter works but back in the lab there's one question i have left for ted so helicopters have the blades on the top yep but i've always wondered why they have the blades on the tail as well right well that can be explained relatively simply because there's an engine inside the helicopter which is driving the road around yeah then there will cause newton's third law says there will be a reaction in the opposite direction and i can show you that by just putting this bearing underneath the center here now it's free to rotate okay now when i switch it on you'll see that the blades going around that way means that the body is going to be pushed around in this direction okay so there we are you can see this is the reaction to the torque and that's why you need the tail rotor is pushing air sideways and that's going to move keeps it coming back to keep it steady and when i switch it off again of course you'll see it it'll go back the other way so if anything ever went wrong to the to the tower you'd be in big trouble big problems yes in short tail rotors keep you on the straight and narrow without them you'd be spinning in circles something i had a little taste of earlier just a little coordinated exercise so that's the mechanics behind the magic of helicopters but it takes a lot more than that to keep a big beast like the 101 in the air to navigate to search and to rescue it takes the very latest in aerial technology the aw101 is a flying supercomputer with the processing power of 25 pcs running two and a half million software lines of code [Music] it's an incredibly complex feat of electrical engineering firstly the 42 kilometers of wiring that will thread throughout every aircraft are assembled they're laid out on giant looms the circuitry tested then plugs are attached next the looms are fitted into the paneling and tied off bundling them like this protects the wires from vibration abrasion and moisture once they're all fitted then every circuit is individually tested and checked eventually all this will be hidden behind paneling but not until the very final stage of delivery [Music] with the body of the helicopter complete and the nerve center in place as well the engineers turn their attention to the brain the cockpit this is the smart and extremely complicated bit the home of a critical system called avionics scott plimley explains can you define what avionics are forming avionics are the electronics that are involved in the aviation business in the original setup of aircraft everything was mechanical but as computers got involved there was a need to develop systems specifically and they became the avionics now it's got to the point where the computing power on board manages so much information gathering it all together producing all sorts of displays but also doing all sorts of calculations on behalf of the pilot really so this is like an extra member of the team yeah it can be seen as an extra member of the crew in the old days that would have been flight engineers on aircraft a lot of the systems monitoring is done by the avionics now and all these avionics must be thoroughly tested long before the chopper takes to the air this happens back on the ground in a room called the avionics test suite where they can be driven to destruction we control the whole environment here which is what you you can't do on the aircraft so we can make sure scenarios that are impossible in real life or would be unpleasant in real life we can test that all the numbers go to the extremes making sure that we have no strange software glitches or hardware glitches before they go flying exactly like the real cockpit five digital displays show the pilots everything they need to know the ones on the outside are flight instrument displays their job is to give the pilot the slang instruments that they would have had even in the mechanical days the center display is used for system management most of the time this is where all the old engine instruments have now been replicated electronically in this case you're looking at a lot of engine data at the top hydraulic pressures temperatures but the 101 has a lot more than just digital versions of all the old dials and gauges it has an automatic flight control system better known as fly-by-wire as well as gps collision warning systems voice recorders and communication systems to name but a few all designed to work even in the toughest environments [Music] advanced avionics allow the pilot to fly this helicopter even in the most extreme weather conditions but more importantly they'll save lives for rescuers when visibility is next to nothing these instruments will allow them to detect even the slightest signs of life the most powerful is a new type of radar open up the nose of the 101 and you'll find it this anonymous looking great panel is actually the most advanced helicopter radar on earth it's been designed and built over 700 kilometers from yeovil at leonardo's airborne electronic facility in edinburgh chief engineer tim bunge explains how important this bit of kit is [Music] this is the most important piece of kit on the aircraft as search and rescue missions go you couldn't do it without the radar it's the thing that does the searching for you if i'm a small boat lost at sea in the dark you can't see me with with a camera it's too dark the radar provides its own illumination so in simple terms it is the torch that you shine around to try and find something [Music] that innovative new radar is called the osprey and it provides a 360 degree view unlike traditional radar it's not mounted beneath the helicopter leaving plenty of clearance a key requirement for some customers they're flying in very rough terrain they can be rescuing people at snowy conditions rocky conditions they can't guarantee there's a nice flat place to land a helicopter when they need to so they want to have maximum ground clearance they give them ultimate flexibility to set down wherever they need to for their rescue mission but how can a panel just 51 centimetres wide with no moving parts provide a 360 degree view the answer is to have three of them so what we've done with the osprey solution we have our helicopter we now provide the 360 degree coverage by three fixed panel antennas mounted one in the front and two are mounted in the sponsons facing backwards each panel provides 120 degrees of coverage together you get the whole picture we cover the full 360 degrees but with no moving parts three antennas mounted internally effectively to the aircraft structure and hence no impact on the aerodynamics of the ground clearance what gives the radar its exceptional power is this the transmit receive modules there are several hundred of them inside every grey box we can't show you it's top secret but tim explains in simple terms how this unique radar works if i'm in a dark space and i want to see something what i need to do is switch on a light the light travels out if there's something there it'll be reflected back and i can pick that return up with my eyeball what happens with the radar is very similar it's a different frequency so it's not visible to the eye but we generate electromagnetic energy it travels out reflects back of anything that's there we receive it process it and then put it on a display for an operator to visualize [Music] each little module both emits and receives energy put hundreds together and you get a powerful imaging system this light panel as you can see is made up of hundreds of small bulbs each in its own right not the most powerful but put them all together and they provide more than enough illumination to light up this whole room the osprey antenna works very similarly we have an array face made up of hundreds of transmit receive modules each in its own right a miniature antenna each in its own right not the most powerful but combined in an array they provide more than enough energy for the high performance detection we're offering as part of the antenna the individual transmit receive modules are constructed in the micro electronics lab first they're assembled from an array of tiny parts just a few millimeters in size then a machine called the auto bonder connects the parts together all 140 bonds are just 25 microns wide the width of a human hair and made of gold one of the most conductive metals now the modules are complete in the workshop the frame they'll sit in is prepared tiny pads absorb heat generated by the electronics vents are screwed in to allow variation in air pressure as the chopper changes altitude finally the radar is finished it's time to put it to the test with a range of 370 kilometers you might think the only way to try it out is from the top of a very tall mountain but they have an ingenious setup where they can test the radar without leaving the factory [Music] this facility is our compact antenna test range this is where we test all our antennas before we deliver them to make sure that they're functioning correctly we can test the full capabilities of the radar in here so what you see in this room is effectively simulating a much longer antenna test range but in a compact and condensed form the foam spikes are designed to completely absorb straight electromagnetic waves to stop them interfering with the measurements the panel is mounted on a five meter tall six and a half ton tower it emits an invisible beam of radio frequency energy as it slowly rotates to test its transmissions we transmit the energy into the first mirror it reflects into the second mirror and finally we detect it in the horn over here on the wall vice versa the receive functions the antenna we can transmit out of the horn through the mirrors and receive it in the antenna the total distance of that is actually only about 35 meters that path but what you'll see is the mirrors have a curved surface on them which actually flattens the wavefront and allows us to effectively synthesize or simulate a range that's more equivalent to about 13 kilometers once the radar has been fully tested it will be fitted to this whole batch of aw101s electronic radar like this will greatly improve their search and rescue capability its high sensitivity and fast response time will save lives not just those in peril but also the crew themselves [Music] [Music] the final phase of the process is about to begin welcome to the flight shed in here the engineers are carrying out final preparations ahead of the 101's first test flight side doors are checked and rechecked they must slide easily without sticking the bubble windows which allow the crew greater visibility are fitted to the frame at the rear the gate is slowly opened revealing this helicopter's cavernous capacity [Music] the cabin of the aw 101 is huge 27 cubic meters of space which can be customized for many different uses you could drive a 4x4 in here or carry up to 50 people and still take off thanks to those three powerful engines but for search and rescue this space will be kitted out with stretchers medical supplies and even the facilities to carry out surgery whilst in flight that fit out will happen much later on right now engineers are working on getting this helicopter completely ship shape they run the aircraft through a giant car wash it's designed to test whether it's completely waterproof and spot any leaks that need fixing over three hours the rig is moved slowly along the length of the chopper the final stage is the most important attaching the blades one by one they're carefully fixed to the rotor head the first of this consignment of aw 101s is fully loaded and ready to fly but when will it take to the skies it's early morning here in yeovil i've heard there's a chance the very first test flight of one of the new aw 101s could happen today there's an air of anticipation as we wait for the final approval no civilians are allowed into the test aircraft but in the meantime i've been told there's one way i can get my hands on the cockpit controls this is a cockpit procedures trainer or to you and me a simulator [Music] okay so if you'd like to sit there look there's a hand hold up here and another one over there so you can i'm going to take it for a spin after all how hard can it be here's our cockpit you can see here is our collective control yep there's our cycling control and down there in the distance you'll see the pedals which are going to control the tail rotor and this action okay okay if you want to just then gently raise the collective so just raise it up okay yeah just that's it so you can see we're going up that's fine and now if you just let it go it'll come down on its own see we're going down quite rapidly at the moment turns out a little bit harder than i thought i crashed it it's all right no problem maybe second time lucky it's just a little gentle push to the left yeah and now the same again to the right oh yeah okay now we just need to wait for it to stabilize again it feels like you're moving doesn't it it does yeah my second flight's going remarkably well but all good things must come to an end because it's time for the hardest challenge of all landing all right so you just need to pull back with your right hand just keep pulling back you see our speed is starting to decrease how slow do you want to be when you start a little bit slower than we are now we're doing about 90 of them probably want to be doing less than 60 if we can just back a little bit on the cyclic now and see if we can get uh get over onto the wrong way okay oh that's fine 42 41. 150 feet all right we're just gonna oh all right just a little bit short of the runway but that's okay too close there we go your first landing in the helicopter thank you very much that i really enjoyed it sorry i crashed that's okay this has given me even greater respect for the job the pilots do while the simulator was fun i can't wait to see the real thing in action here it is the finished product this is the norwegian aw 101 and it's about to take off for the very first time it's a nerve-wracking step for everyone who has poured their heart and soul into crafting this machine but this aircraft was born to fly and it's time to earn its wings finally we have liftoff [Applause] now after 20 minutes of dizzying maneuvers they touch down looks like a successful flight to me but let's ask the guy who really knows chief test pilot andy strachan we've just seen you take the aw 101 on its first test flight how was it it was great it was very good for our first flight and we managed to run through all the things we wanted to test on the first line and there were no problems uh there's always odd little snags here and there but no major problems at all no it was actually quite good for a first flight is it a fun machine to fly yes it's great it's a big helicopter but for its size it's very agile and and it really is a pleasure to work with the systems while it's always fun to fly helicopters it has a very serious purpose to test the entire machine and what is it that you are looking for in a test flight we have a script that we work to so we're looking to make sure that all the various components the aircraft are working the way they're supposed to be working we run through checking first of all the really important bits like the rotor system and the engines and then we go on to check the handling and then we start to look at the systems in detail as the flight progresses so it progresses from a nice and safe incremental manner really we don't rush off into doing something before we're happy that it's it's safe to move on as chief test pilot with nearly 40 years flying experience andy knows exactly what makes this aircraft perfect for search and rescue it's a very nice aircraft to fly it's for its size it's very maneuverable which helps when they're now having to maneuver close to ships or cliffs and things like that and the whole basis of the design is to try and make the handling quality of the aircraft and the systems on it reduce the workload of the crew they're going to be working in difficult conditions with a lot of stress and pressure on them and our aim is is to make that better so when they're doing the difficult bit the searching and getting somewhere to look for people part that's made an awful lot easier and i think we've achieved that with this aircraft [Music] the aw 101 is a highly advanced flying machine packed with technological wizardry and innovation but it's only when you see it in action how this huge helicopter can take off and land on a sixpence that you truly understand why it is perfect for search and rescue in desperate situation when conditions are too extreme for most helicopters this machine could be the critical difference between life and death [Music] [Music] you

Channel: Free Documentary

Views: 144,303

Keywords: Free Documentary, Documentaries, Full documentary, HD documentary, documentary - topic, documentary (tv genre), engineering documentary, engineering, technology, technology documentary, tech documentary, mega manufacturing, helicopters, helicopter documentary, helicopter engineering, helicopter manufacturing

Id: iZU4Q-LEPdI

Length: 48min 14sec (2894 seconds)

Published: Fri Mar 04 2022