The massive Fatigue Carousel helps keep roads safe

Dipublikasikan tanggal 22 Mei 2022
The "accelerated pavement testing facility" in Nantes can simulate decades of road traffic in a few months. Here's how. ■ More information: lames.univ-gustave-eiffel.fr/...

Editor: Dave Stevenson davestevenson.co.uk
Camera: Guillaume Juin www.guillaumejuin.fr
Producer: Axel Zeiliger at Block8 block8production.com

Thanks to Jérémie Chabot for the suggestion

I'm at tomscott.com

on Twitter at twitter.com/tomscott

on Facebook at facebook.com/tomscott

and on Instagram as tomscottgo

Komentar

  • I really hope the scale of this comes across on camera. Drone shots would have been wonderful, but unfortunately the Carousel is just a couple of kilometres away from an airport!

    • It looks small, but Im assuming it kinda is?

    • Hi

    • The prudent text-books give it In tables at the end 'The stress that shears a rivet Or makes a tie-bar bend- 'What traffic wrecks macadam- What concrete should endure And this is how they find out what to write in those books. Great video

    • Can you share a Google maps/satellite link?

    • Ha, what they need to make roads out of is the inner non-replaced track those wheels roll on. Bet they have never replaced it like they do the outer track.

  • Tom Scott: always pointing out things I didn't know existed but now that I think of them they make perfect sense

    • @MUZKF47 What about it do you think is overengineered? Given the forces it needs to apply and withstand over long periods of time, it seems to be very sensibly designed to me.

    • Looks like pointless over engineering

    • @Robbie James not really, we're used to it, and im sure most countries do sth similar

    • ​@Nenrikido damn! that's harsh.

    • 👆👆👆For investing guidelines🚀🚀....

  • I actually was just wondering about how civil engineers/scientists know what kind of abuse a road can take and how to measure lifespan of a road. Tom... always answering questions I never thought I'd get an answer to.

    • Psychotropni Lachtan před 1 sekundou They take a wild guess. Most of these companies get liquidated after a while just so nobody can hold them accountable when it starts falling apart. And politicians are more than happy to secure new contracts for their buddies in construction bussiness so its not a big deal. Everyone wins, except the tax payers ofcourse.

    • A lot of it is also just decades or centuries of experience. As the guy said, you cant speed up things like the asphalt deteriorating over time.

  • I feel like this could also be used to test tire durability

    • @Stephen Eyles It does not seem to simulate cornering to any great degree. The wheels appear to be always running tangentially to the circumference, thus running virtually "straight". The tires may experience some stresses across their contact area, since the outer cross-section has to cover slightly more distance than the inner. Sort of why the pivot axis of a vehicle's steerable wheels is not vertical, but canted asymmetrically on left and right in such a way as to force the right wheel to pivot more on a right turn and less on a left turn, and vice-versa.

    • @Stephen Eyles the tires appear to be designed for that, look at the closeups, I think ..., just a guess and 2cents.

    • @Melon Mann its not a bot

    • Yes, I was wondering if the testing tyres are specifically designed for the process, if they have any extra properties.

    • Xavier is everywhere

  • You have a knack for finding the most interesting stuff!

    • @Clarke Corvo okay.

    • @brot und wasser pff.. 520. get on my level, kid.

    • 500th like

    • I think Tom's special skill is taking otherwise mundane things and making them very interesting.

    • ok

  • I do wonder, how many wheels does this facility go through during a testing cycle?

    • Bet they'll last longer than ours, so we change whilst there's still tread, could run these to slicks few k more miles there

    • @Railnut Maybe they can cut a deal. modified road surface with standard tyres and modified tyres with standard road surfaces.

    • I wonder if the tire manufacturers use this to test their tires too!!??

    • Would be interesting to know, I would guess 1 as even though its constantly turning slightly theres no load applied through the turn like a real vehicle where the turn is caused by the friction of the tires physically changing the direction of the vehicle, and acceleration and braking which would also increase wear are again not being applied through the wheels, all they're really doing is simulating the weight of a vehicle but the tyres arent really having the same forces put through them as they would on an actual vehicle

    • This was exactly what crossed my mind too. The wear and tear of those tires must mean that they need to be changed very often?

  • "A fatigue carousel" is a great way of describing a really exhausting week and that's exactly what I'm going to start calling it.

    • trolldespair

    • Capitalism has us all on the fatigue carousel while the ownership class rides all the relaxing water rides and exciting roller coasters

    • @Masinary I'll do as I please.

    • Treadmill from Hell

    • Me too

  • As a civil geotechnical engineer, this is fascinating to me. I’d love to get ahold of their data.

    • @El Gatto Oh, spare us the usual geo-engineering soililoquy

    • A visit from a soil wizard. People think soil isn't so complex, but they would be very wrong.

  • When I worked for Minnesota Dept. of Transportation, the Research Dept. was proud of establishing a test site on a real piece of freeway with real traffic. This machine gets data a lot faster than that.

    • @FurnitureFan in the long term for a large area maybe, but I imagine this machine cost millions of dollars to design build and operate

    • Right, the fatigue carousel must save a great deal of public money by identifying the most durable materials beforehand.

  • At work (agriculture tractor parts supplier) I've seen something very close to this, but instead the test subject is the moving part, not the floor. Tractors ate tied to the center and kept driving in circles through many obstacles as a way of validating its fatigue strength. It is so similar to this that now I'm wondering what else is running in circles out there.

  • I really appreciate the way you can make a 5 minute video that feels like more than a lot of 10+ minute ones

    • I feel like they could have a similar carrousel indoors with cooling coils to simulate freezing conditions, and ice/thaw cycles.

  • One of the mysteries in life - how does Tom Scott find all these niche things that you never knew about - but sort of make sense when you hear about them!

    • @James ROFL nice troll there James.

    • @James citations needed

    • @James unless you've got some examples... your statement is factually inaccurate

    • Atlas Obscura

    • He's like a modern Mike Rowe with Dirty Jobs.

  • I hope Tom remembers to gets his cameras back when the testing finishes in a few months.

  • I feel like they could have a similar carrousel indoors with cooling coils to simulate freezing conditions, and ice/thaw cycles.

  • Reminds me of the days when I worked with non-rewind platter systems for 35mm film projection. I calculated that during disassembly of the film unto smaller reels, the outer rim of the platter would reach tangential speeds of around 100 km/h - and I would have my hand with a tea towel just a few centimetres above it, ready to stop it quickly in case of an accident - like a fuse blowing in the motor - so as not to end up with half a kilometre of a movie (or more) in a pile on the floor, and of course touching lightly to slow down in a controlled manner before a splice. When going fast, it also moved a lot of air, and could even lift cloths covering the movie on the platter below it. Good fun, but might be a little scary for people not used to it! (Now I'm only working with 1800 meter reels. They don't reach the same speeds, but still plenty fast, and the tea towel is still at hand. :) )

  • Unfortunately this wont test years of weather erosion, but it is still absolutely fascinating

  • I want not prepared for how utterly terrifying this machine is, even through a video. I think the scale really does come across on camera here (I imagine that shot of how much it squashed the wheel at the start of the video really helped sell the weight of it), its scary just to watch, I cant imagine standing next to it

    • Its ok, we will be ok.

    • @longshot7601 I love that idea. I once took a flight to a small island where they weighed each passenger before assigning us seats. Plus we got rearranged after the plane unloaded some freight on each island.

    • @Thomas Payne it is a large machine moving extremely heavy weights at high speed. I’ve worked on machines very similar to these, and I fear them for a reason. It’s not like a truck or Covid (not sure where your logic is on that) the forces these machines withstand is far greater than anything like that.

    • If you find this machine "utterly terrifying" then you must have been absolutely petrified when scientists told you about covid and cancer. How are you coping with the constant threat of nuclear war and terror1st attacks? You should definately avoid beaches in case you see a sand castle or seagull and faint. It's also probably best to avoid theme parks, trucks, cars, planes, ships and tractors...just avoid roads altogether that way you won't be terrified all the time.

    • Meh. It wasn't that terrifying. Y'all are feeble.

  • This was really cool! Would've never thought of such a contraption (or even testing things like this) existed, tbh...

  • I just want to say thank you for continuing to make the seemingly boring things of life absolutely fascinating! I love learning weird little behind the scenes tidbits on stuff

  • This was a really cool video. You always do such a good job putting these together. Cheers

  • I really admire your nerve Tom! It takes a firm presence of mind to stand there delivering a monologue Inna calm and casudk tone while also working hard to suppress your bodies dear response to the enormous, fast, heavy machine moving very swiftly behind you. You weren't even flinching, what a legend! Say, did you get to practise any of your high school french while you were out there? Thanks as always for the captions!

  • That carousel is ablsoulty terrifying, I'm going to have vaguely infrastructure-themed dreams for weeks, Thanks Tom! 10/10 would show to friends and family :)

    • @Paul Lowell In the middle of a pandemic, I'll pass.

    • You need to get out more

    • @Martin Finnerup Because i watched the video! Maybe you should! And charging cars by the road is a stupid idea! Try thinking about it!

    • Imagine trying to cross the road while that thing is running

    • @Dan Quayles ITS SPELT POTATOE! Not sure you meant to post that in this thread? Also, why?

  • Thanks Tom, never thought about how roads materials are tested for ware. Great video as usual :)

  • Makes me wonder how much additional ware comes from acceleration, deceleration, and the tires putting power to the ground rather than just rolling.

    • @Colorado Strong you ever hear the phrase pick your battles

    • @zach moyer _Alot_ is a town in India. _A lot_ is more than one of something.

    • in a state with heavy trucking its alot extra most trucks stay in the right lane and its like driving over constant speed bumps get in the left and its smooth sailing.

    • Unfortunately this wont test years of weather erosion, but it is still absolutely fascinating

  • 4:37 - as an aerospace engineer I totally agree with that. there are aerodynamics analysis tools called CFD - computational fluid dynamics. but my professors used to call them colorful fluid dynamics (bc they give you nice colorful contour images as results :D). because the chaos theory applies to fluid dynamics, minor changes in the initial conditions can cause massive differences. therefore you can only trust them *a little* after you validate its results with real test data by changing some parameters in the tool.

  • Tom: “Roads need to last decades French highways agency: “les routes doivent durer des siècles!” UK highways agency: “Roads need to last 5 minutes”

    • @zazak972 Montreal, the city which is in a permanent state of construction..

    • And there is Quebec....

    • Well, they don't last centuries. Those are not roman roads. Some roads are remade every few years (highway and heavy duty roads). Cars are not a problem, but as soon as you have heavy trucks on a regular basis, roads end up damaged very, very fast. This cost a lot of money, and is one of the reason I hate those trucks and loves trains.

    • Belgium: "you guys maintain roads?"

    • 😅 In fairness, UK roads have speed limits, which must slow down the deterioration process a bit.

  • I love stress tests that actually use these cool practical tests instead of some math along with tiny test samples. There’s a reason for both, but seeing the test in action is just a lot more fun.

    • @Tim D Hey, thanks for that info.

    • @Dezgesh I really loved and was bothered by an episode of How It's Made where they showed the machine that stress tests a new piano movement by rapidly and repeatedly running all of the keys through a rising chromatic scale. Loud, but hypnotizing.

    • @Tim D The question was not, "are my tires already wear tested or not?" it was, "Can a rig like this be used to wear test new tire construction methods?"

    • Other fun ones include machines that simulate mattress and cushion use by repeated simulated sitting, and that one college project where they tested how many (simulated) licks it REALLY took to get to the center of a tootsie pop.

    • @Simon Zerafathey also have ways of testing tire slip angle on F1 carsm

  • I actually live in Nantes and didn't know this carousel existed. It's great to learn something new !

  • Hats off to the engineer, his presentation was very informative.

  • Another amazing report, Tom. Love your work

  • I've often wondered how they do accelerated tests of road surfaces. And now I know!

  • Two fascinating things I learned from this video: 1. There are things called fatigue carousels responsible for testing roads 2. There are windproof mics

    • @Michael Scott-Joynt in those cases, it's more likely that the crew didn't prepare for a windy scene and/or didn't have access to a windscreen than them not being aware that they exist. it's extremely common for shotgun and lavalier mics to use windscreens.

    • @Luke Royle The way I read it, the person is surprised to watch a video like this which isn't ruined by wind noise, even though there's simple technology to address it. Most of us have probably lost count how many random videos we've seen where the creator acknowledges and apologizes for wind noise, but has nothing more to do about it. In just about every case, the creator shrugs it off as if they can do nothing about it. Seems more awareness is needed.

    • Haha ! I knew windproof mics existed because I've seen reporters standing outside during a huricane trying to film a short segment.

    • Most mics you see are designed to be "windproof" to some extend, with rough /fuzzy surfaces surrounding the membrane to dampen any air vibrations that aren't sound. The "windproof" mic he's talking about is just a regular clip mic with a small sponge to act as a windscreen, like a "pop filter" but all around the mic rather than in one direction.

    • 3 . Eye protection has been around for years .

  • "this spins terrifyingly fast" *says while posing with a smile and a thumbs up in front of the deadly machine* yup, that's our Tom

  • This is the coolest thing I never knew existed. And also smart considering the cost of infrastructure projects.

  • This covers something I deal with at work ALL the time. Management is always looking to do things more cost effectively, which makes complete sense, but they are convinced that everything can be analyzed on computers, eliminating the need to expensive real world tests. They actually asked the engineers "what additional modeling and simulation tools/packages do you need to eliminate testing?" It's mind melting trying to explain things to them when they have tunnel-vision on eliminating a large budget item. No matter how sophisticated and detailed your models are, there are always assumptions that need to be made in building them. You need that physical data to actually show the models are giving the correct results, and if not, make fixes/corrections/adjustments to the models to have them line up. You do this up front, the models can save tons of money and time down the line.

  • This is wild, I wanna stand next to this machine and see the scale in person. Also I couldn't help but notice one of the four wheel arms made a different noise as it was spinning full speed.

  • The fatigue carousel is what I'm calling my internship from now on.

    • Change your perspective: You are not running in circles! It's a downward spiral.

    • The same term applies to any job with a crappy boss.

    • read that as `relationship`

    • :(

  • The only remaining unanswered question: has anyone ever rode this thing? Speaking of amusement rides, French manufacturer Reverchon had to make a fatigue test machine that simulated jeans (> butts) rubbing on a coaster seat. Same idea, testing in months what several years of operation would do to the padding.

    • I'm glad I wasn't the only one to think of that.

    • My local IKEA has a machine running to show how they test out chairs to last. It's good to see.

    • Know Joe Scott though?

  • This guy can make testing pavement interesting. That’s how you know he’s done a good job at this

  • Damn I used to live next to this monster and I had no idea it existed. I even did my driving license test 100m from there. So weird to think this thing is running continuously

  • I'd love to see Solar Roadways tested on this. To be honest I think it would probably be too dangerous to even try.

  • For those wondering about tire life: At the typical speed of 70km/h, that's about 1700km in a day, or 50,000km in a month. Commercial truck tires are apparently expected to last somewhere between that long and twice that long, spending on which hastily-found online source one reads.

    • @FurnitureFan keep they stray elephants out?

    • @johno I assumed the strong fence was to protect wildlife from wandering in overnight.

    • @EhCanadianKid1 the curve produces wear too

    • Who asked?

    • This machine could double as a tire tester while testing roads.

  • Looks like this could also be used to test the lifespan of different tires as well.

  • What really sells it is how nervous tom is just standing there ^^ I haven't known about that test stand but it absolutely makes sense.

  • Thanks again Tom Scott! Again something I never new existed, and yet is quite fascinating. I really appreciate these videos

  • Wow this goes a long way towards explaining how French motorway surfaces are (generally) so damn smooth.

    • They replace surface when it's needed- up here in TARTAN MUNCHER LAND- WEE KRANKIE STURGEON - thinks we should walk 🚶‍♀️ hence back to a surface before roman roads.

  • Can we take a moment to appreciate how well this guy was able to communicate this in a second language. Amazing.

    • @【Chucklebutt】 ʘ‿ʘ France has some massive push towards language purity in the society. But as a non-native english speaker I found this french scientist quite easy to understand. And I agree on the USA/Europe comparison. In terms of area, population size, population distribution, size of subdivisions, and many other metrics the US and europe (or rather the EU) are quite similar. Similar enough to make them comparable. And interestingly Canada is closer to Europe than to the US in many metrics.

    • Found the american

    • English is the de facto language of science and technical fields, many engineers / scientists speak it for that reason.

    • @dereknalley And sometimes, not that much accented.

  • A amazing machine, I never heard of that before. Thanks for showing.

  • Congratulations on 5 million subs Tom. You are an awesome person!

  • Massive and fast spinning machine in the background, I bet Tom is wondering "What's the worst that could go wrong?" I wonder if they've considered adding UV spotlights, to simulate a longer exposure of the surface to sunlight?

  • I'm curious, when they said they can change out the tires, add axles, all that -- can they mix and match to simulate mixed use, or would they all need to be the same to keep the whole thing balanced?

  • 1:21 “Suspension compression” and “Thermoplongeurs” are exactly the kind of buttons I expect to find in a fatigue carousel

    • @jBurn! Indeed

    • ok

    • ok

    • this control panel looks like the LabView standard Frontpanel

    • @Dood Uhm ackchually it's "compresseurs suspensions".

  • Congrats on 5 million Tom! Well deserved sir 💖💖

  • I was thinking about how much they must spend on electricity over the course of several months. Then I realized that they probably spend just as much on tires.

  • That is quite interesting. Would be lovely to discuss the effect of the lateral force being applied to the wheels while spinning like this and how that affects the end result.

  • There is actually 1 of these Accelerated Pavement Testing Facility's in New York and 1 in Virginia in USA. I Remember a News Segment couple years ago that showed these in action.

  • Driving is my profession and I didn't have a clue about these machines. Mind blown as normal Tom 👊

    • @greatleapforwards this would be fantastic

    • @TheSphongleface How do you get your deliveries, by carrier pigeon?

    • Driving all day is just lazy

    • You’re welcome

  • I want to ask a question about the inner support wheels on the really narrow path, but I feel like it is like the "why don't you build the whole plane of what the flight recorder was built of" kind of question. So I guess the rubber and pavement is really, really heavy duty and long lasting.

    • they most likely only support the full weight of the arms while the outside wheels are being changed and have very little load on them during operation so they last longer

  • This is great, if only the US could use them to test roads too!! Would love to see roads that lasted decades here...

  • Always nice to see his town in this kind of video. Never heard of this system before, very interesting !

  • I love your videos. This is random (par for the course) and really caught my imagination. Thanks dude.

  • They need those here in the US. Freaking roads break up in a year or two!

  • would be interesting to see how long the solar powered road ways lasts with this.

  • Utterly terrifying

    • I don't think this would be very interesting in Slow Mo

    • 27 likes...

    • Only 10 likes as of right now 👀 Also, salutations Dan or Gav!

    • Hi Gav and/or Dan!

  • This experiment should be everyday. And congrats on 5 million subscribers Tom!

  • How do you find these places, Tom? Great video, cheers!

    • @Steve It's in the video description ;)

    • Not sure he’d want to give that information away

    • @rafaelskt4ever yep

    • legit

    • "I've got an email..."

  • This is exceptionally interesting! Especially to me as a gear head.

  • I wonder how accurate this is because I always thought that a major thing in road surface damage is the constant freezing and melting that this dose not simulate.

  • As always Tom, 10 out of 10. Please keep this up. More of youtube needs to mimic your skills.. love the work. Be safe.

  • It would be interesting to test IRD road sensors on that! Setup a WIM and compare ESALs (Estimated Static Axle Load)!!

  • That is seriously unnerving. I've had nightmares about being stuck to the outer wall of a machine like this, with incomprehensibly massive arms passing at astronomical speeds just inches from my face. I didn't know such a thing actually existed!

    • If you think oversized objects moving quickly is freaky, I'm not gunna tell you to look up what a ships propeller looks like in motion underwater

    • Could these hallucinations be from the body overproducing DMT?

    • Hey big fan of your flashlight UI software :) imo you changed the scene forever

    • If you were actually in that situation, that would be a great opportunity to practice controlling your mind/fear. Making your amygdala stand down can save your life!

    • ToyKeeper' Therepist: The giant machine which spins massive metallic arms at high speeds isn't real, the giant machine which spins massive metallic arms at high speeds can't hurt you. I mean, why would someone even invent the giant machine which spins massive metallic arms at high speeds? Tom Scott: Explaining exactly why the giant machine which spins massive metallic arms at high speeds was invented.

  • Thats amazing, I wishI knew where the other facilities were, and where major countries like America test them. Im assuming UK tests here in France, but even that wasnt obvious in the video. Very very curious.

  • That's all well and fine as long as the road builders do everything to the same specifications without cheating. This thing also doesn't simulate the bouncing of heavy trucks that has a severe affect on roads.

  • Seeing such a large object move at that speed is completely bizarre and so cool

  • That is quite fascinating. Goodyear used to have a test track out in West Texas. I don't know if it is still in use or not.

  • This is what I would call a perfect Tom Scott video. A really unique thing that does one job, and does it very well, that I didn’t know I wanted to learn about. Thank you!

    • This is such a Tom Scott subject that I thought I'd already seen a Tom Scott video about it until I realized that wherever I'd seen it previously didn't have in-person video with the person explaining it.

    • Nah, that's Tom Scott Plus

    • It's not a perfect Tom Scott video without Tom Scott strapping himself to the carousel and passing out due to G forces.

  • Considering how crappy some roads I've been on this must not work too well... xD Also, you could simulate anything you just need a powerful enough computer, which we don't have... yet.

  • Some drone video footage might have helped show the scale of this machine. Really interesting, thank you.

  • Thank you for your help! It works perfectly!

  • "Unnerving how fast and big this thing is" - we never think this about a truck on a city street because we're used to it.

  • I got three on my Tom Scott bingo today: "It's unnerving to be standing this close" "X doesn't just mean X, it can take months..." "I hope the size and scale is coming across on camera"

    • You also got the free center square "Tom wears a red shirt and jeans"

    • Technical commentary on a porn video???!

    • Don’t forget the “ah! I got x’d, ow”

    • Now make it a drinking game.

    • Where do I get a copy of the bingo card?

  • I wonder how much energy does this machine consume.

  • I question the real-world accuracy of the wear on the pavement. The wheels are constantly in a turn, which wouldn't happen on an actual road. The tires are constantly scrubbing and losing rubber in a turn. That will cause rubber buildup on the pavement, which might alter the wear of the substrate beneath over time.

  • This would make one hell of a fairground attraction.... imagine the g forces it pulls!

    • I'd like to try that. They should have an online lottery sometimes to attract participants.

  • Does the rate of tire change match that of the simulated number of tyres a road would come into contact with over say, a 10 year period?

  • Much respect to the small inner ring of apparently indestructible material, quietly holding up without being part of the test.

    • @Derrick Foster I now understand hydroelectricity!

    • @Boo Bah You need something to generate electricity for an electric motor too.

    • It's really the backbone of the whole operation.

    • @Boo Bah Of course, but that doesn't make it stop being a hydraulic motor, or it correct to call it an electric motor.

    • ​@Ben Hobby Hydraulics aren't a power source; you need _something_ to crank the pump.

  • Imagine being out on that when the machine starts up. Then you get to test 20-30 years of hit-and-run accidents.

  • I'm interested in the tyres on the carousel; how much wear do they go through?

  • Does the testing work in both directions? Can the carousel study the wear on new tyre compounds and sizes and shapes, or on those mechanisms being conceived of for transferring currents to charge EVs on the go? Or indeed the effects of new surfaces on existing tyre setups?

  • This is very interesting. I have never heard of a Fatigue Carousel before. Its amazing how the Romans built rods that could handle the technology they were driving at the time. Some of those roads survive today. While today our roads need repaired constantly.

  • The limitations Mr Hornych talks at the end are just as important as the benefits. I really enjoy listening to researchers because they try to look at every angle possible.

    • @Pat The Plant In this case I don't think it matters. The road surface should not experience any transverse force from the wheels because the centripetal force is on the rotor.

    • @Pat The Plant Hmm... Something with good shear profile, but bad compression response?

    • @Pat The Plant I imagine that ruts and grooves appear more in straights than on curves. I can't imagine that a lot of people will take the same exact route through a curve, but when it comes to straights, people will generally just follow the middle of the lane.

    • I wonder if there are materials that are fine on curves but fail rapidly on the straight.

  • I had one of those in my back yard. I never knew what it was for so we just cut it up for scrap. Oh, well. I could have used it to test my driveway.

  • I thought it's the seasonal change such as heat, rain, frost (and road salt) that deteriorate roads the most.

  • I found myself timing the rotations and thinking "I can totally move to the centre and back with it spinning in full speed!" hehehehe

    • @HappyBeezerStudios - by Lord_Mogul Nice one! If it wasn't clear though, we were talking about getting to the middle (as it is physically impossible to get to the actual centre) and there would be two rotating barriers to this. So, in short, less distance and two stops either way. =)

    • All it takes is maths. We know it can go to 100 km/h, but runs normally with 70 km/h. The average track perimeter is 120 m, means the radius is about 38.197 m. So the distance to run is about 76.394 m. For the wheels to run 70 km/h it would have to do 1166.666 rotations per hour or 19.444 rotations per minute or 0.324 rotations per second. That is 3.085 seconds per rotation. It has 4 arms, so the time between the arms is circa 0.771 seconds. To go to the middle and back you would have to move 76.394 m in 0.771 seconds or around 99 m/s which is around 365.5 km/h or 227.11 mph or 197.35 knots. For the full rotation speed at 100 km/h you'd have to move at around 141.47 m/s or 509.3 km/h or 316.46 mph or 275 knots. So if you can run about as fast as an F1 car or about as fast as a jetliner during takeoff, you might very well reach the center and back. Note: This is without the deceleration and acceleration necessary for the turnaround at the center.

    • Yep, Me too. "I could do a running dive roll and make it to the center nooo problem" ha ha

  • The modules at the ends of the arms look similar to the cross section of an aircraft wing. Imagine changing the shape slightly and increasing the speed it might just take off!

  • Yet another job nobody told me about during the high school job fair, along with flinging chickens at airplanes. Thanks Tom.

    • @Robert Pruitt Chickens aren't the risk to planes, but they are the best analogue for the average bird and most easily available. Bird strike can absolutely down a plane

    • @kat The alternative is 300 dead passengers on a commercial aircraft including children whose finally moments would be sheer terror as they plunge into the ground close to the speed of sound... The real tragedy is that after going through the engine there won't be anything left to BBQ.

    • @lunavixen015 Well TBH, if you're flying into chickens, you've probably got other problems to worry about.😄

    • @kat It’s used for testing for bird strike, a real phenomena when flying and using other objects would add variables that can’t be controlled or wouldn’t match what happens with a real bird

    • @kat Well simply put, nothing can more accurately tell you the effects a duck would have when hitting something, than a duck.

  • I just moved to the Philippines and can't believe how good the roads are. You can literally drive all day and not see a pothole. Most of the roads are concrete, beyond that I dont know anything about them...but theyre great.

  • In my area there's still a test patch in one of the industrial estates using different types of brick surface and they're still holding up today. Older than me.

  • Yes this is genuine hack and works as promised in my case. Thank you very much.

  • I have so many questions...what an awesome invention. Thanks for sharing.