Can we reach the Speed of Sound with Lego? 767 MPH Tip Speed! 4k

[@GazRsExtremeBrickMachines]

Thank you for the positive response to the video everyone! I really appreciate it :) I’ve just figured away of getting much higher speeds! I feel silly for not even trying this before as i didn’t think it would work originally. I’ve just hit over 650mph tip speed so hopefully they’ll be a follow up video soon. Thank you

[@rs37_]

Wow, incredible, over 1000 km/h, thanks for the spoiler ;)

[@Cole218]

Try to make it lift off the ground

[@nathansaldanha5445]

Brick Experiment Channel can go up to 19000 rpm!

[@r3b0x91]

@@nathansaldanha5445 He uses a modded Lego motor with the limiters removed and a stronger power supply instead of the Lego issued battery. This channel is strictly Lego.

[@Mattiaeragiapreso]

Sound speed is directly proportional to the square root of the absolute temperature (v = 20.05*sqrt(T) = 20.05*sqrt(t+273.15) ), therefore you can try this experiment in a colder environment. For example, the speed of sound at 20°C is 1235 km/h but at 0°C it is 1192 km/h, a little bit less (4%) I hope this can help you - maybe, in your next tests you can at least turn you air conditioning on :)

[@joenagel6644]

Try a hard drive disk platter. They're kinda heavy but they're balanced really well. I think valve and the losses from it are what's holding you back

[@ardwordcross5632]

I think a CD or DVD could do as well

[@Claptrax]

@@ardwordcross5632 if you really wanna save weight use a mini disk

[@Yishuu]

69 likes and i don't wanna ruin it

[@AiOinc1]

I second this. They're also designed to rotate at high speed for long periods of time. Sadly they are designed to drag air with them (for the head stack) but it's worth a try

[@GazRsExtremeBrickMachines]

Hi thanks for that Joe! I think the balance is the key like you say! I tried some really light paper and it did worse than the normal 80 gsm paper which I featured on here :)

[@basilicon.]

When your tin foil disk exploded, it was experiencing 1400 g's of centripetal force around the edges. Pretty incredible if you ask me. At this rate, you might actually hit material limits before you break the sound barrier.

[@Rheologist]

He *is* hitting the material limits

[@Markomilicic012]

@@Rheologist yes but its ye cheep aluminum foil from martwal

[@LutraLovegood]

@@Rheologist I don't think he has hit material limits yet, tin foil is capable of more but just a thin sheet of it was never going to hold up to such high speeds.

[@person8064]

I calculated about 12000g's of force with a speed of 358 km/h and a diameter of 17cm

[@minecraftgod3171]

It also shakes a lot which helps the dissasembly

[@ezrarichardson279]

The fact that all these people in this comment section are being helpful and trying to propose ideas on who to achieve a commun goal is pretty cool and relatively rare. Great video! I want to see the project succeed!

[@pollosasadosalcarbon]

lego wheel go fast

[@JasonMitchellofcompsci]

No it's not. If anything youtube comments are obnoxiously positive. What's rare is that they are giving genuinely helpful and thoughtful comments instead of low effort positive comments that could fit onto any video with the either the absolute minimum effort to tailor it to the video, or going way overboard with it but poorly.

[@ezrarichardson279]

@@JasonMitchellofcompsci True. The actual good feedback is what’s surprising

[@racer927]

@@JasonMitchellofcompsci Why not have constructive criticism with a positive, encouraging tone?

[@grapefroot6515]

@@JasonMitchellofcompsci you look like you have an entire phone book of discord “kittens” and their social security numbers written down with a death note hardcover on it

[@whoiam5838]

This might be something useful which I learned from XKCD: The edge of a spinning disc can't go faster than the **square root of the specific strength** (tensile strength divided by density) of the material it's made of. So, to get a disk that can spin faster you need to pick a material that has some combination of stronger an lighter.

[@jaffarebellion292]

Graphene. It seems to be the answer to everything nowadays.

[@mOries0795]

Carbon fiber?

[@whoiam5838]

@@mOries0795 If I'm remembering how to read my Ashby chart correctly then yeah, carbon fiber looks pretty good. However, I do think it depends on how the carbon fibers are arranged.

[@LutraLovegood]

@@whoiam5838 Considering how most computer fans just use regular plastic, the shape /structure of the spinning object seems pretty important.

[@JoeParkerAndThePower]

I reckon CNC cut carbon fibre or even GRP might work. CDs as some have said here seem heavy but you'd want to check the maths. Has anyone ever tested the tensile strength of a CD lol (I'm kidding, it's basically polycabonate with a shiny side obvs)

[@melcrose]

"aluminum foil clearly doesn't work - Let me try... ALUMINUM FOIL."

[@GazRsExtremeBrickMachines]

😂

[@BODYBUILDERS_AGAINST_FEMINISM]

this is actually my favorite comment on all of KZbin. Screenshotting for future laughs

[@TheSuperGuitarGuy]

Aluminium

[@scorpsamus]

Seeing it attempted a third time is what sent me

[@AshrellStudios753]

@@scorpsamusthe 4th time sent me

[@MTBCrafter]

6:50 look at the black pins turning due to the vibration. Thats soo cool! Love it.

[@simonjelley]

The rotor has significant pumping losses, it acts as a centrifugal fan. If you sandwich a disc closely between stationary discs it will go much faster, as less power will go to pumping air. That said, you’ll need a balanced, precise and stiff disc for the rotor. Beware that if you use CDs etc. if you reach failure the fragments are vicious. Gluing radial carbon fibre ‘tow’ will improve strength to weight but will be difficult to keep balanced. Pairing with a prop balancer for RC plane/drone props might get you there. Beware there will be vacuum generated either side of the rotor as it centrifugally removes the air, so side discs also need to be stiff.

[@emiliaolfelt6370]

in english, air is sticky. cover the sides of the big spinning disk and it will form a vacuum. less air make less sticky. like when u put ur hand over a vacuum cleaner and the bwaaaa speeds up.

[@aech_two_oh]

@@emiliaolfelt6370 thank you for the translation

[@GazRsExtremeBrickMachines]

Hey thanks for that info, really appreciate it cheers :)

[@greystonegamer]

@@emiliaolfelt6370 thank you for the translation, I cannot speak smart

[@ENCHANTMEN_]

Is it really supersonic if there's no air, though? 🤔

[@cooldude6527]

6:44 when the intrusive thoughts win

[@josephj807]

Fr lol

[@3_or_more_characters.]

lmao

[@sage5296]

the tin foil disk slowly disintegrating from the rotational forces at 3:50 was pretty cool. Mach 0.5 is still pretty impressive with lego motors and axles all things considered

[@humanitysenterprise]

Slowly?

[@Ibloop]

Blame it’s diameter

[@That-One-Aviator]

it littrally rips itself apart

[@JeffHB123]

This guy and the slow mo guys need to do a collab. Would be awesome to see the vibrations in the object spinning.

[@alexandreman8601]

It'd awesome to see a video with both channels.

[@Jaceb164]

We need this collab!

[@haflingerfan5800]

The problem with using bigger and bigger discs is that if you double the radius you get twice the circumference and twice the speed but the mass of the discs quadruples because the area goes up with the radius squared. So it's probably better to go with a small disc and increase the gear ratio instead

[@GazRsExtremeBrickMachines]

Hey yes bigger definitely made it worse! I need something so thin but rigid :)

[@WaluigiisthekingASmith]

Technically it's the moment of inertia which makes it worse. Since moment of inertia is 1/2 mr^2 for a disk it goes up with the 4th power of radius

[@namedescription320]

Why would moment of inertia limit maximum speed? The cause is just air resistance, not mass

[@namedescription320]

​@iRian I agree that moment of inertia affects acceleration, but not the top speed.

[@namedescription320]

@@finalstarmandx6644 Top speed is reached when sum of all torques is equal to 0. Here we have 2 sources of torque - engine and air drag. Moment of inertia does not affect any of these.

[@saturatedpotato8797]

At 7:15, you can see the black rivets holding the frame, are rotating from the vibration, just thought it was cool

[@trattoretrattore8228]

This is extremely cool! Sound barrier or not, I think you reached a world speed record for Lego.

[@LHS_Shadow]

Did actually reach the sound barrier on the edge of the aluminum foil. That’s why it kept exploding

[@ananazaaaztheman3425]

Achieving the speed of light with lego

[@Iv_5489part]

​@@ananazaaaztheman3425Humanly impossible. You'd need 1 rotation per Planck time

[@PaulFisher]

Amazing how the aluminum foil discs tear themselves apart. It would be so cool to see that happen in super slow-mo!

[@GazRsExtremeBrickMachines]

I’d love that too Paul, I’ve been looking for an affordable slow mo camera! Hoping to get one soon, most are silly money.

[@technicalfool]

@@GazRsExtremeBrickMachines Lots of youtubers use Chronos cameras. They'll do thousands of FPS and while they're not cheap, they're a lot cheaper than Phantom. Probably cost less than what you've already spent on crazy-level Lego gear. :P

[@TheLionOfOrange]

watch 'CD shattering at 170,000 FPS' by the Slo Mo Guys. Not exactly what you wanna see, but pretty damn close

[@Blox117]

not that amazing when you can rip it apart easily by hand

[@maxedbricks589]

It’s because the disk hits the resonant frequency of the material. Once resonance occurs the material experiences amplified deformations and explodes because of it

[@ethancotton1549]

The foil disc's are actually a great example of tensile strength of materials, and are a great way to show why Tesla's hydroelectric generator would never work on a large industrial sized generator scale. At the time of its creation no materials could take the centrifugal forces. For context the generator had a peak efficiency when spinning at ~45,000 rpm iirc, and when used with a disc similarly sized to our current hydroelectric generators at around 2 meters, the tip would be reaching speeds in excess of mach 13.

[@Athens69420]

Breaking news: Man built makeshift hypersonic missile using LEGOs making LEGO stock rise 1000%

[@blau6832]

Fkn military-industrial-Lego-complex...

[@GazRsExtremeBrickMachines]

😂😂 hey there! :)

[@Athens69420]

@@GazRsExtremeBrickMachines hey

[@blob0000]

Stepping on a piece of Lego already hurts, now imagine one coming flying at you with 400 km/h

[@teknikadam9001]

Most people are wrote about the loads but I think an important portion of the power is lost on the plastic axles and gears, their flexity reduces power greatly so maybe a design could adress that, also having lots of rotating things increase the intertia and cause air friction so decreasing the number of gears could work better, maybe some gears can be put in the same axle. Although as I think about it, inequalities of the motors also a problem for the system maybe flexity of gears is a requirement for alignment of all motors.

[@GazRsExtremeBrickMachines]

Hey thanks for that! The one problem is axle strength which is why I need so many inputs to spread the torque load. :)

[@teknikadam9001]

@@GazRsExtremeBrickMachines For this problem, I think the best solution is steel axles, Legos plastic axles are not enough for this projec

[@nikolasvip121]

@@teknikadam9001 that would break the entire objective of doing it by legos

[@2fxst2drxft]

5:24 try more things like this, make crazy things that attach and spin on it like that, perhaps try and get such high speeds that it lifts itself up!

[@ahjsbkdjhavkcjhvac]

wonder what would happen if we just keep adding more motors and eventually make a propeller to try lift the craft

[@rrieux]

Somebody already did it :-) kzbin.info/www/bejne/ioXYmmapnbGFhs0

[@blau6832]

Well, would that be a bigger relative increase in power or in weight?

[@shoty_x1693]

To make a craft you need enough power or lift force to lift the motors up. Or else it's just a high speed fan

[@mftripz8445]

If you weren’t behind some kinda of shield, that was pretty ballsy. The Centrifugal force of that rpm range has to be insanely powerful, especially with those weights attached with a string, one blow to the head from a breakoff would be most likely fatal.

[@ezmatt]

nah there isnt that much kinetic energy in those little weights, its kinda like sparks, they're thousands of degrees but do no damage when they hit you because of how little total enthalpy there is

[@HL65536]

you need very aerodynamic "arms", and as few as possible. Try just one "arm", balanced out by a counterweight. And the "arm" has to be propeller shaped, but with a flat angle, so it does not move air. Then try to find the torque vs speed curve for different gear ratios and use the setting with ideal power and construct "arm" length accordingly. And while centrifugal force gets better with increased diameter (if you want constant tip speed), air resistance depends on total area, so a smaller object at the same speed creates less of it.

[@GazRsExtremeBrickMachines]

Hey there thank you for that! Appreciate the input! I may have found the answer! Video soon hopefully :)

[@coolskywizard]

@@GazRsExtremeBrickMachines try RC helicopter blades. They are usually well-balanced and are aerodynamic

[@escain]

Actually a flat disk has much better aerodynamic than any arm.

[@MGSLurmey]

@@escain Better aerodynamics but significantly worse losses from pumping, or in laymans terms literally dragging the air around. An aerofoil shape is ideal, or sandwiching the disk between two static disks to remove the air pumping.

[@suqma]

what about fishing line or dyneema that has incredibly good tensile strenght to weight ratio

[@zanus5591]

I love how pins spinning from vibration at 7:07

[@WalkerO-dp8jq]

5:00 the ultimate weed whacker

[@TheSmallL3]

IKR

[@zejayeeisme9226]

Uh, honey, I was cutting the weeds and it went through the house. "HOW?" Legos

[@KOEGMD]

0:16 sounded like demonic screams from hell at first

[@FAT_SUSAN]

I think it sounds like a train

[@mattsteel7220]

The sounds that the foil discs made when disintegrating were amazing! Bit like a cyberman dying 😂

[@GazRsExtremeBrickMachines]

Lol, I wish I had a good camera to see this in super slow mo :)

[@Nobrainn]

@@GazRsExtremeBrickMachines you should try to record it on your phone if he is able to do slow mo

[@thelarryman482]

aAaAAAAaAaAaAUUuUUUUuUUAAAAAaAaUUuUGGGHhHHhH

[@TratUsYT]

“it looks so circular and smooth! i wanna touch it!” *famous last words*

[@ms2649]

That ending made me laugh so hard That disk was like "nope im out, not havin it today" 😂

[@guts60]

Fun fact: the sound of a whip cracking is literally the end of it breaking the sound barrier. The whip was likely the first man-made object to achieve supersonic speeds, even if only for a small moment

[@AidenTheBaconFR]

3:41 sounds like a jet taking off in ptfs

[@Arjan732]

Yeah it kinda does

[@HaydenHellyer]

It does bro. Also how did you know I played ptfs man. You should friend me.

[@andreylyutikov8348]

3:05 United airlines flight 232

[@Obama231]

💀

[@zhanglihussey8222]

American Airlines flight 11

[@Yes-i-card]

AA191

[@jareddeckard2703]

That's so cool! 330 mph is incredible!

[@GazRsExtremeBrickMachines]

Hey thanks Jared! I Appreciate it :)

[@hensema]

Spinning a bullet to the speed of a bullet and hoping a glove and/or sweater will stop it is my new definition of optimism.

[@2fxst2drxft]

4:09 it sounds like a car!

[@59ftgb]

Same

[@ilovelmg]

my i4 honda jazz after I installed a turbocharger:

[@ci.netproductions]

2:52… interesting how the aluminum disc shatters under immense centrifugal force. It reminds me of how TheSlowMoGuys did a video about this phenomenon showing amazing footage of what a spinning CD or Record looks like just before it shatters.

[@GazRsExtremeBrickMachines]

Hey thanks for the comment, much appreciated! I wish I had better cameras :)

[@wumbosaurus9121]

Was gonna make that exact comparison. Love that video, incredibly educational as well. Was insane seeing the disc warping, with the warp moving at a different speed than the actual movement of the disc

[@Ibloop]

It’s stiff and light and when it changes/folds too much under the immense speed it shatters

[@ilovelmg]

3:14 sound like my annoying neighbor car Yes his car exploded

[@MorganSaph]

This video just seems to prove that a bigger diameter is slower. Also, you need to use materials that have a terminal velocity higher than the speed of sound if you want to reach it. Also, the flatter and less warped the disc, the higher the speed it will withstand, before further deforming.

[@GazRsExtremeBrickMachines]

Hey there thanks for the comment I appreciate it! I’m continuing with this right now, I’m getting close :)

[@JOAOPROGAMER00]

6:37 sounds like a car

[@JDAirlines1]

Exactly like a Mazda rx7 fc

[@JDAirlines1]

I meant fd

[@susq_345]

6:05 contraption sounds like black mesa anti-mass spectrometer

[@2fxst2drxft]

6:24 weedwacker moment

[@barefootalien]

A very valiant effort! But I think you'd need to optimize your rotor a _lot_ more than this to get to Mach 1. Something like a precision machined aluminum flywheel might do it. Also, maybe consider aluminum axles for the last few stages? I imagine they're better balanced, straighter, and will lose a lot less energy to vibration losses as you pass through resonance bands.

[@dannypipewrench533]

3:00 Looks like aerodynamic instability.

[@Mesias_3447]

imagine aliens studying this piece of footage and going, "well this is an interesting way to disintegrate tinfoil "

[@ZachIDE]

it might help to stabilize the open end of the output axle. I feel like the primary vibrations caused by unbalanced rotating mass are really holding it back

[@randomdev8735]

take 3 is amazing to see how the disc just shrinks

[@ryalexstudios]

8:02 sounds like a propeller airplane

[@goodtheme-wl1he]

0:09 bro’s already got the best machine! 0:22 HOLD ON, WHAT?

[@dingdongmcnugget]

Try ironing the paper, it should help to flatten it out and minimise vibration issues

[@2fxst2drxft]

For those of you who don’t know, 0:46 that’s how cars work to get high speed.

[@phlave]

I noticed something really interesting in the "tower assembly" you used in the later tests in the video: the bolts connecting the two segments laterally were spinning in their sockets! Could this be some sort of resonance in the structure, maybe even sapping away energy from it?

[@LutraLovegood]

Yes, definitely losing a lot of energy there. The whole construction was shaking.

[@Outdoors_kid]

people spending years of their life to make a plane that can reach the speed of sound. this guy: LEGO LEGO LEGO

[@NelKeu]

Wow! It's impressive that wheels reach such crazy speeds! 😎😲

[@Sillybug_]

Cringe

[@SirFiggles]

@@Sillybug_ ironic

[@twen7yseven]

That foil spinning needs to be filmed in high speed! Looks like it stretches out, very neat.

[@freenickor]

From the point of physics, I must tell that to reach the maximum possible speed, sideways from putting all the weight to the center and making maximum diameter, you must minimize the possible air resistance, bc on high speeds it's taking much of the power. That's why you made out only 124 km/h with those lego bars

[@GazRsExtremeBrickMachines]

Hey yes I do agree! The drag was insane on that bar! I’ll experiment with other things in the future :)

[@clawsoon]

@@GazRsExtremeBrickMachines If you actually want to get up to the speed of sound, you might want to look at something like the Busemann biplane for the shape of the thing you're spinning: en.wikipedia.org/wiki/Busemann_biplane The problem is that once you get up past about 0.6 times the speed of sound, resistance starts increasing dramatically, up to ten times what you'd expect based on the (already huge) quadratic increase that you see at lower speeds: en.wikipedia.org/wiki/Drag-divergence_Mach_number So to get from half of the speed of sound up to the full speed of sound you'd expect to experience 4 times the drag (and require 8 times the power), but instead you experience about 40 times the drag (and require 80 times the power).

[@Chevsilverado]

Putting weight to the center will only make the disc accelerate faster, not raise top speed.

[@freenickor]

Well air would create more stopping power, if it encountered the parts which're more far from center, therefore creating longer lever for air to push against

[@Gforce_2398]

I love how the 17cm one sound like literal car engines lol

[@pawelch9536]

Can you try spinning a propeller on that thing? Good video👍👌

[@karyjas1]

Yes, but not at hypersonice speeds. A prop would have the highest drag of all the things he tried by a far margin

[@GazRsExtremeBrickMachines]

My next video will feature this! I have an idea but not sure it will work :)

[@pawelch9536]

@@GazRsExtremeBrickMachines ok fine😁

[@joecolvin4203]

I was looking through the comments to see if anyone suggested this. Lol. I want to see it... though you will want to ware a hard face mask with other proper protections. If it fails, it's going to hurt. Might want to setup a stand for your tool and hide under and around something to be safe. Cage will also work.

[@copeland7225]

This is, by far, the most unhinged thing I’ve seen someone do with Lego.

[@rs37_]

As you can see in 2:34 you get the highest circumferential speed with small, stiff discs, maybe you can do it with a more stable disc of about 10cm! I keep my fingers crossed for you and thank you for the great content, I can't wait for the next video...

[@GazRsExtremeBrickMachines]

Hey there thank you! I really hope to achieve! Last night I managed 650mph (new tactic I stupidly didn’t try lol) :)

[@rs37_]

@@GazRsExtremeBrickMachines Wow, incredible, over 1000 km/h, thanks for the spoiler ;)

[@ajanhattara]

thats why airlanes use jet engines to gbreak soundbarrier. You cant rev propels near soundbarrier because propel wing begins to vibrte in such way that it breaks

[@tiporari]

Model aircraft propellers routinely break the sound barrier (most the of noise you hear on high performance stuff). Those high speed composite propellers are balanced and strong enough to not kill you. Granted their positive pitch means they need several horsepower to achieve those speeds, but you should be able to find something with a shallow pitch. And EDF impeller comes to mind.

[@luigilops1395]

i give you a craazy idea: reduce gear ratio. You don't need to hit 100000 rpm and every time you go up youlose power

[@dannypipewrench533]

3:31 Is air resistance enough to grind down the foil?

[@ExternalScientificCorporation]

Yes

[@booooooooooooooooooooooo]

Looks like centrifugal force to me. The material is too heavy and not elastic enough and the centrifugal force ripped it apart

[@theexplodedguys264]

Thank's for the free dog whistle also! 🤣😂😂🤣🤣

[@TheDemocrab]

4:50 You do realise that now you have to make a technic whipper snipper? (Brush cutter for the non aussies)

[@smloader]

weedeater

[@GazRsExtremeBrickMachines]

I still had to google lol. A strimmer!!! I do plan on doing this, I’ve even made the end fitting out if just Lego and it cuts really good :)

[@TheDemocrab]

@@GazRsExtremeBrickMachines excellent, I look forward to seeing it :D

[@StockyG437]

I feel like if you were to sharpen the saw blade piece somehow, you could actually cut something.

[@dylanjacobs6590]

You should try to put this in a vacuum chamber to eliminate air resistance. A lot of energy is lost to air resistance espaccially with the disc. I am curious wich speeds you will get to.

[@GazRsExtremeBrickMachines]

This would be great to try cheers :)

[@dylanjacobs6590]

@@GazRsExtremeBrickMachines Looking forward to it!!!

[@jacobsharf8173]

But then it’s no longer the speed of sound (which depends on air pressure)

[@Johngloger]

@@jacobsharf8173 so that means that his another challenge is to get speed of light.

[@harshitkumar4760]

I don't know if the sound barrier can be crossed by this or not but you will get much higher speed if you put something with big diameter but very small rotational inertia (basically the last item you used without the weights or whatever it was at the tips) and also if you can minimise the woblling a bit. It will be much faster like that.

[@The.accurate.angels]

1:27 time for the saw to work like a actual saw

[@Sulticune]

Appreciate the warning during the intro, I have a cat, so I put my headphones on!

[@danielclarke7109]

Try it in a vacuum chamber, pretty sure you can do it at reduced air pressure.

[@GazRsExtremeBrickMachines]

Hey thanks Daniel I’ll look into this! I think brick experimental did it so will take a look :)

[@MinazukiShiun]

Wait, I'm sure you can build a vacuum chamber from Lego!

[@pfosirens1398]

Well done! Now make an RC car with that. Because of weight it will definetely go around 40-80km/h! I want to see it!

[@janettemarquez6755]

5:52 we open a new carnival

[@MCBE_Gamer-06]

6:35 it sounds like a turboprop plane that's is gonna take off 7:32 Part 2

[@dentjoener]

This might be much much harder the closer you get to mach 1. Planes travel at around mach 0.8 because it's the fastest they can go before air resistance just skyrockets. This is your main enemy here. I have a feeling you need a LOT more power to even get tiny things faster than the speed of sound. Plus centrifugal force will be astronomical at this speed as well. I wonder if it can be done though :)

[@sgthop]

Parasitic drag increases with the square of speed. The reason airliners stick around Mach 0.8 though is less to do with pure drag and more to do with the shockwaves that start forming creating unsuitable buffeting for control surfaces among other things. Propeller tips can easily break the sound barrier in high performance aircraft, such as the Tu-95. However, again, the shockwaves created by this are undesirable. Realistically, the mechanical drag of such a large geartrain is what's holding a Lego creation from spinning something up to the speed of sound. There are so many shafts and so many gears and each one of those just compounds the force needed to drive the output shaft.

[@dentjoener]

@@sgthop Yeah you're right, drag increases with the square of the airspeed. But the drag coefficient Cd peaks around mach 1. Which in turn increases the required power by a lot more than just the square. That's what I was referring to. All of your other points are absolutely correct though.

[@GazRsExtremeBrickMachines]

Yep I fear you’re right! At a guess I’d need 10 times the amount of motors continuing on like I did here! But I do think there’s better lighter things to spin with far less drag which could help! Would be great to achieve with Lego power :)

[@TheOriginalBlue62]

@@sgthop If you've ever heard a Harvard, or T6 Texan flying they have that really distinctive buzz from the prop tips breaking the barrier- on WW2 era training aircraft :D

[@clawsoon]

@@dentjoener The Wikipedia article on drag divergence says the drag around Mach 1 is up to 10 times what you'd expect. So instead of seeing 4 times the drag (and requiring 8 times the power) to get from Mach 0.5 to Mach 1.0, you'll see something more like 40 times the drag (and require something like 80 times the power).

[@broncoxy]

i swear lego technic guys are gonna be the first ones to visit Mars and then upload a video named 'can i reach Mars with Lego Technic?' that barely gets any clicks until it suddenly gets recommended to everyone a few years later

[@tjorvegro9651]

Try ceran Wrap (I don't know if I spelled it right). Its really light does not break as easy as the tin foil and if it's a disc it doesn't have a lot of drag. All the ropes stuff suffered from huge drag. I don't think it's possible with the rope because the drag punches them back if you are really close to the speed of sound and they will just pull back and reduce the diameter

[@GazRsExtremeBrickMachines]

Hey thank you for that I’ll look into it! :)

[@Smalltownthings]

Idk how I’ve just now found this channel but I’ve been missing out!

[@pikapower5723]

5:11 honestly thought that shit was going to start flying

[@KitkatTSB]

Same

[@AT_AV_EDITZ]

Samee

[@Roboseal2]

2:15 sound like my generator when a storm happens.

[@turle8645]

Try it in a vacuum

[@Neon64913]

No budget

[@antumurikks4861]

this is some serious lego testing !

[@delta4050]

2:11 the ultimate papercut

[@ron133.]

30 years later we're going past the speed of light using LEGOS

[@MikeGtrMan]

Is a vacuüm chamber something that you could arrange for the next test? That would maybe make M1 possible... Love these kinds of tests!

[@GazRsExtremeBrickMachines]

Hey thank you Mike I need to look into this cheers :)

[@MikeGtrMan]

@@GazRsExtremeBrickMachines Looking forward to it! Have a nice day :)

[@GazRsExtremeBrickMachines]

@@MikeGtrMan same to you thank you :)

[@oerlikon20mm29]

you cant break the sound barrier if there is no air...

[@MikeGtrMan]

@@oerlikon20mm29 Hi! Going faster than mach 1 doesn't have a lot to do with air pressure.

[@ae_master]

The speed almost reached of an average plane speed!

[@anamariedavila4574]

5:57 they disappeared 😂

[@Thegreatestdawg]

Mine too 😢

[@googoogaga556]

another master piece to add to my 3 am binge watch.

[@xerox-0579]

What kinds of batteries is it using? You can get a bit more power out of Energiser lithium AAs. They can put out a max of 1.7v each.

[@GazRsExtremeBrickMachines]

Unfortunately just 1.2v energiser! they would be great!

[@MaydupNem]

I really want to see supersonic legos, so please don't give up

[@bredsheeran2897]

now touch it

[@razanahmad7519]

Its all fun and games until your lego starts flying XD, anyways Great Video!!!!

[@Andrew90046zero]

7:55 airplane noises

[@akkristor]

I wish you had a high speed camera. That foil tearing itself apart, shredding from the outside in would look AMAZING.

[@harrisdavid912]

Did you consider maybe a disc from an angle grinder? Also, for cutting foil, you might try it with heavier foil with lower tolerance, and a compass, maybe that will help keep it flat

[@Maxol787]

You should add an aerofoil to the ends of the bar you spun, then calculate how much lift it makes

[@SweetieFortnite]

2:04 what in the papercut

[@jebbz]

Why does both of your replies have 0 likes? I’m gonna copy and paste this to the other one

[@brandenhoolehan7149]

The biggest problem you’re going to have here is using materials of uniform diameter. Remember the issue with a space elevator? The taller the tower the stronger and wider the base needs to be. So the rotating “blade” or column needs to be tapered. Try using chopsticks or a tapered ABS extrusion if you wanna keep with the “legos go supersonic” idea. Another thing you can do to increase airspeed at the tip is to blow air over it at a 90 degree angle. This turns it into a helicopter problem where you can eek out an extra couple mph in the tip speed if your wind is going fast enough.

[@GazRsExtremeBrickMachines]

Hey there Branden thank you very much for that! I’ve been playing around with this for awhile now, the best results I’ve achieved is with nylon. The problem with it though is you can’t see much or hear much as it displaces little air. I’m quite close to the magic figure but I fear from a viewing point it will add little. With anything else I’ve tried the motors just haven’t the power to get close unfortunately :)

[@brandenhoolehan7149]

@@GazRsExtremeBrickMachines I think another thing you may be able to try is to make a transmission and different gears. So you have the torque to get up to speed but also are able to get more and more RPMs out of it. I feel like the problem you’ll have there is with “shifting” and eventually once you get closer to 650mph you’re going to have to deal with bow shocks and the hell that ensues there. And likely a few “rapid, unscheduled disassemblies”

[@tms3529]

5:41 at this point. It looks like its gonna fly lol.

[@Ibloop]

It didn’t before?

[@martenziit]

Next vid: Lego beats the speed of light.