400mph Rocket Knife

[@darekdiscovers]

Kevin, thank you so much, I am honored to have had the opportunity to work with you on this experiment! Can't pass up the chance to say, I had an absolute blast!

[@N279]

👍

[@zacharynolan9553]

Thanks for helping make the video happen!

[@yellowbacon69]

@@N279 I

[@SilentRacer911]

I guess you don’t want to lose your channel and or get blocked permanently… that would suck, damn guidelines… But must you redact absolutely EVERYTHING that’s important? I can understand some but all? It’s part of free speech… it’s the same kind of thing the Shulgins ran into when they released their books PiHKAL and then TiKHAL.

[@Lazures]

@@SilentRacer911its so people dont try to figure it out what he made

[@DistractedDingo]

This man is determined to get on every scary three letter government agency list, isn't he?

[@nstar6412]

Honestly, respect

[@Elepski]

He's on thier speed dial. And they don't even need Google maps when they visit now.

[@christosdeschaine9444]

Your statement assumes he isn't already. He built a vehicle mounted laser weapon, for crying out loud.

[@ogge8375]

and the aarp

[@nezrokoctouka3130]

They're only scary if they can stop you

[@boomboy4102]

The sequel we’ve needed for so very very long

[@Charles12]

Technically its a threequel

[@Genuinespaceman]

Yes

[@ERROR-ip3ph]

From knife rocket to sextuple knife rocket to Thomas the armor piercing rocket

[@TheoHiggins]

"Next week" finally arrived

[@Blockenheimer]

9:05 i have no idea where you got the idea for Thomas the Intercontinental Knife Missile but I love it

[@Naptic9012]

there was a episode where he smashed into a station master's house so that's probably where he got it from

[@Cyberpunkninja92]

I prefer to call it Thomas The Rocket Engine

[@JesseVanSchaik]

Dude when I first watched this it caught me by surprise and I could not breathe for a good 5 min

[@Nitro.Breathing.Dragon]

Thomas the thermonuclear bomb

[@BeastgamerYTRP]

lol that was hilarious

[@theshadowsagas3617]

I love how you've gone from making cool sugar rockets to casually conducting drone strikes in someone's backyard

[@DiegoGomez-pk5tg]

The refrigerator needed to pay for its war crimes

[@TheNamesArif]

hence the name, backyard scientist

[@nitramreniar]

@@TheNamesArif Ok so the name was accurate for the starting point - does that mean that he should now change it to "backyard weapons manufacturer"?

[@shreyanshbhogayta6349]

Backyard military industrial complex BMIC

[@Babushkabongwatr]

​@50 person account experiment backyard lockmart

[@terraeric2350]

I love how this channel has evolved from kid friendly fun videos to almost breaking geneva convention. Edit: I didn't expect to get so many likes xd. But I wanted to add that I genuinely love your videos Kevin, and I really hope you keep making them (:.

[@michaelt.9372]

It’s not like Kevin signed it so who cares?

[@petersmythe6462]

This is the evolutionary arc of most channels. Eventually they will be showing how to make VX on cocomelon.

[@wumbo2255]

Already broke the geneva conventions with exploding bullets lol

[@kerbaltubehd5737]

It’s more of a Geneva checklist now

[@teiermyler4926]

underrated

[@matthewnelson5293]

I laughed so hard at the line, "Guess what, rocket nerds! I figured out how to make my own rocket fuel, and it's twice as dangerous."

[@davidnoland2574]

He is very right on that point highenergy rockets can be very dangerous...

[@crapple5759]

@@davidnoland2574 sugar-saltpeter is pretty benign. Put it in a tube with a small opening and you have a relatively safe rocket. ¯\_(ツ)_/¯

[@Hnkka]

@@crapple5759 Next step is using ammonium perchlorate as your oxidizer and you get this.

[@Hnkka]

@@crapple5759 I think the rocket has aluminium and perchlorate and maybe more of things?

[@sg_kerb]

@@crapple5759 aniline + nitric acid is a pretty decent one

[@JTCBoss1]

“Today I woke up, went to the bathroom, and got out of bed.” My brain- “In that order??”

[@anthonyschocke2831]

I don’t know if you think if he was serious or not. If you do, let me remind you that jokes exist.

[@azrielweewoo]

​@@anthonyschocke2831dude, he knew it was a joke, i dont think you understand but he was making a joke himself too, dont need to get mad at someone for that

[@genericgamingprotogen]

@@anthonyschocke2831 r/wooosh

[@anhnhvn]

@@anthonyschocke2831 r/woosh

[@Ar-daq]

​@anthonyschocke2831 ever heard of a joke?

[@williaml8868]

I love how you can transfer from making borderline explosives to bladed rockets to a subscription service for teaching stem to kids in like 8 minutes

[@gn6691]

Florida man in a nutshell

[@che887]

@@gn6691 Florida gentleman

[@MyName-vg8yu]

what do you think stem is?

[@Chrontius]

How else are kids going to learn they want to melt-cast explosives so they can build supersonic flying knife missiles?

[@DarkIzo]

+the casket dance meme at the end

[@koneeche]

Kevin in 2015: "I poured molten aluminum into these wacky everyday items!" Kevin in 2022: "I made a makeshift hellfire ROCKET capable of reaching mach ~0.5 which can tear through a metal car door!" edit: in seeing all the responses, it makes me wonder: what DID he even make? a hellfire missile? cable rocket? mechanical rpg? knife boomy thingy? I guess we'll never have a good answer to this... rofl

[@SafariPlum]

This comment should be pinned at the top, LoL I was in stitches.

[@DaemonR13]

A BLADED makeshift ballistic missile

[@DannyrusK]

damn your comment was so funny you even got Naomi in stitches.

[@makoado6010]

its not ballsitic missile.. more like a "mechanical" rpg. aaaannddddd originally this is how the people of india used them where form arrived to europe around napoleonic war. and ofc the guy tired to sale it as own invention.

[@terrabiker]

The name "ballistic missile" kinda gives you a huge hint what the trajectory of such missile is....

[@jonlusz5027]

Gotta love it when Kevin starts the video by explaining how legal bombs are boring, then proceeds to make his own bomb that's twice as strong.

[@trezdonandblizzard5642]

Why hit the teddy bear

[@jimmynutrition694]

6:39 TARGET LOCKED, INITIATING EXTERMINATION PROTOCOL

[@grimreefer213]

10x as strong

[@steamed_ham1767]

I want to know how to look up how to make rocket fuel without ending up on a list now

[@werk62]

@Steamed_Ham17 65% potassium nitrate, 35% sugar. Mix with water, slowly boil off the water in a pan. Pour the mixture into tube before it hardens. Don't touch it because it is very hot and also sticky.

[@gl3nji]

9:02 I can't wipe the smile from my face no matter how many times I watch this "very special rocket"

[@uncle_thulhu]

That drone shot over the back of the rocket as it hit the propane tanks was a cinematic masterpiece.

[@kairimasakaki5407]

ikr

[@UpLateGeek]

Massive congratulations on figuring out how to make your own rockets, dude. And thanks for showing us why you need a license to buy them!

[@ryleyallen185]

Such a shame he had to censor it 👉👈

[@theKashConnoisseur]

@@ryleyallen185 If only it was Google-able... 🤔

[@GameristicForce]

So you have to pour *rocket fuel* into *cardboard*

[@jBurn_]

@@theKashConnoisseur "remove the meatballs from the oven" 😅

[@laxplayer99]

@@theKashConnoisseur I checked my anarchist's cook book that I got put on a list for buying. no rockets, but it does explain how to make a bangalore torpedo

[@Rich-hm9ux]

I love this guy’s passion. I just hope he makes it past 40.

[@MiltonTu]

He will

[@theDude29]

But with only one arm

[@MiltonTu]

@@theDude29 I'm sure he can be careful on his next video, right? Right? Hello?

[@AnimationsAndOtherStuff]

Same

[@mothmanafterdark5924]

​@@theDude29 dude will just make a new arm

[@rinchanlife]

the rocket knife is one of my favorite things you’ve made, i’m happy to see you revisiting it :)

[@bakarimims6384]

MythBusters did it first

[@pqddachu]

@@bakarimims6384 and?

[@jcims]

Check David Windestal's channel. He's got an amazing setup with a ton of cool vids.

[@DirtmopAZ]

Honestly. And like the US Military rocket is WAY too identical to have not been stolen

[@Francois_Dupont]

YOU

[@zabzurto9610]

The rocket fuel explanation was genuinely brilliant comedy, love your work.

[@foggycontacts3212]

Meatballs

[@liamholcroft7212]

@@foggycontacts3212 I agree.

[@shrek5629]

@@foggycontacts3212 ong

[@retard1488]

not sure why he bothered to make a big deal out of it, its just sugar and some nitrate or, less likely, chlorate. grant thompson made videos about this over a decade ago

[@Sk1m_Beeble]

@@retard1488 you mean rocket and fuel, right?

[@Baltux]

Never stop being the most Florida man of them all! Was excited for this since you talked about it on Safety Third!

[@MRcool-qt9rk]

The best Florida man

[@colbymaxwell244]

fun speed saftey

[@harishankar5901]

the other florida men walked so he could run

[@jayasuriyas2604]

Which episode?

[@TheBackyardScientist]

@@jayasuriyas2604 like the last three ive mention it haha. Wills been teasing me about how i keep saying "this week for sure!!"

[@imperialguardsman5726]

Love how from the drone it genuinely looks like an ATGM

[@napalmholocaust9093]

You could torch the blade's spine red hot till a magnet won't stick then air cool and it will be softer to soak-up the shock. Also the same treatment works to soften a small area of hardened steel so you can drill it if it is too hard for your bits. I've got stuff that shrugs carbide unless you take some temper out. Diferential hardening for shock is the same reason why an ax is soft except for an edge that's a different metal slotted in. That and durability from a hardened edge.

[@jmathews470]

Yeah like AR500.....

[@josephwaldner7752]

@@jmathews470 AR 500 isn't impressive in terms of hardness but it has a higher tensile strength, you need carbon content to achieve hardness and ar500 dosn't have enough of it

[@gunners4129]

Wouldnt this work harden it and make it more brittle? I mean it's literally spreading the molecules out to make the metal less dense.

[@coltonm8623]

@@gunners4129 Metal Tempering Tempering is done to develop the required combination of hardness, strength and toughness or to relieve the brittleness of fully hardened steels. Steels are never used in the as quenched condition. The combination of quenching and tempering is important to make tough parts. This treatment follows a quenching or air cooling operation. Tempering is generally considered effective in relieving stresses induced by quenching in addition to lowering hardness to within a specified range, or meeting certain mechanical property requirements. Tempering is the process of reheating the steel at a relatively low temperature leading to precipitation and spheroidization of the carbides present in the microstructure. The tempering temperature and times are generally controlled to produce the final properties required of the steel. The result is a component with the appropriate combination of hardness, strength and toughness for the intended application. Tempering is also effective in relieving the stresses induced by quenching.

[@Dan-yk6sy]

Pretty sure at the speeds the rocket are going you don't even really need much of a sharp blade, just take any preferred type/thickness of steel blanks and cut the "blades" out. Store bought knives just look cool and make good video.

[@sir_vix]

Anything moving away from you at that high a velocity has to be safe. I think this is some of Kevin's best work.

[@ratchetandchank8648]

Bro the ricochet off the car door

[@RotGodKing]

Unless it has the ability to turn around.

[@DEFCON5307]

@@RotGodKing gotta make it a little frightening to be exciting

[@jellyman140]

@@ratchetandchank8648 That flew really high into the air as well, looked like the rocket was still firing, that must have gone far

[@mr.2minutes161]

i don't think want to be at the back end of an RPG, or any rocket

[@andyk4744]

I remember a couple years ago Kevin used to mess around with oobleck but now hes gone insane and is making military grade weapons lmao

[@MrKeserian]

I feel like this is a great companion to Mark Rober's latest video where he realizes that he's basically making an ICBM terminal guidance system and maybe that's why none of his NASA contacts want to help with it.

[@roblowe2714]

@@MrKeserian its the natural progression of science youtubers

[@RianniNishikawa]

@@roblowe2714 they start off as educational and then become weapons manufacturers

[@danthespaceman9747]

I blame Michael reeves

[@blackjak4185]

Michael Reeves is based

[@italianspaghett4359]

i love how this drone-recorded part looks like actual combat footage with anti tank launchers fired

[@mberrios1875]

I love watching Kevin casually make Military Grade Weapons

[@DaniFewell]

Average day in Florida. He should get some help from Nile

[@bittersweet9248]

US becareful..one of these days I think he has high potential to be recruited by the middle Eastern countries !

[@garrettkajmowicz]

They aren't militarily-useful until they can be aimed in a useful fashion.

[@DaniFewell]

@@garrettkajmowicz h-hey, are you supposed to be working here? Why are you tying that cable up in my office?

[@inthefreytoo]

Making them at 1/1,000,000th the price of the closest government weapons manufacturer bid too

[@misaka8417]

After 4 months of watching I Did a Thing, its nice to come back to Kevin and see him do things properly and safely

[@quantumblur_3145]

Better engineering too

[@bIeaq]

Not to mention Kevin's not a shithead

[@Petrslav]

@@C.Mc. idat's first channel was a political channel. The dude went to north Korea to get a haircut.

[@brainrotchallenge]

@@C.Mc. "opened his mouth and inserted his foot" i am sorry what video is it? Or you mean his political opinion?

[@Uberkilltoecheese]

@@C.Mc. yeah i never really got why he was even a smidge popular, he has boring execution, and is just weird in his videos etc

[@williamdougherty3836]

You take Florida Man to a whole new level brother. Setting the bar higher, and throwing the curb for the rest of us. And I just want to say thank you!!

[@MrEazyE357]

What does "throwing the curb" mean?

[@justsomeperson3065]

I'm a Floridian and I worship him lol

[@peng_ting1331]

@@MrEazyE357 probally meant curve

[@gamingwithpancakeman]

9:10 bro took thomas the thermonuclear bomb to the previous level

[@СашаВолков-ф5н]

Thomas the rocket-propelled grenade?

[@mrdrifter3925]

The kinetic energy generated by those rockets is insane! You are on a list for sure.

[@MetalheadAndNerd]

Hiring list

[@cheisz5094]

You're*

[@crunchybones2528]

*yer

[@truerandomchannel]

@@cheisz5094 🤓

[@ZorbadTheGreat]

@@cheisz5094 You can still use *You Are* together. As in, you are a virgin.

[@fnarget519]

Kevin a few years ago : “Haha salt in water go boom” Kevin now : literally making loitering munitions in his backyard

[@ncubesays]

"We're going to get arrested but we did it!"

[@christopherwheeler688]

In what way do they loiter? Seems to me that they just go straight to work.

[@evo3s75]

not a loitering munition tho? nothing of it comes even close to it Just an unguided cable rocket

[@FirstDagger]

@@christopherwheeler688 ; They don't, the poster just used a word they picked up.

[@keekedup]

please learn what words mean before you use them

Duuuuude that was insanly awesome! Spinn-forging the nozzles was absolutely brilliant. You are the true king of Rocket Knife

[@OliverFrei-dh4ty]

"Dad what's that music?" " I don't know""JERMY STOP" "it's no-" "dad or Mr hamburger JERMY??? AHHHHHHHHHHH"

[@OliverFrei-dh4ty]

8:51

[@uwo5786]

Kevin is why we have safety labels on stuff

[@fallschannel4331]

Send this person to Ukraine

[@Stanfordscienceman]

He’s the reason we need to tell people how shampoo works but knowing him he would find a way to make it dangerous somehow

[@guntherwundurbah2458]

He's likely the reason there's instructions on toilet paper

[@TheRadioknight]

@@Stanfordscienceman he would likely turn it into a paste that will ignite if it comes in contact with water somehow

[@KjetilBalstad]

So he instantly knows which should be broken?

[@PlasmaChannel]

This was an incredible and much needed update to the original rocket knife. Love the new style of videos!

[@jasontodd1141]

Oh shoot what’s up Jay!

[@solidacid1337]

The masonry bit trick is SO USEFULL. The thin string holding the cable is super ingenious. The six-knife'ed rocket tips look so porking menacing. The car door hit was.. *cheffs kiss*. The drone shot of the propane tanks.. wow. The fridge shot... beautiful. Finishing off with one of rockets tips as a tesla coil topload playing Coffin Dance? dude.. Kevin. You, William Osman, Allen Pan, Nile Rainbow™, Peter Sripol and all the other awesome people on there are my favorite KZbinrs. The quality of the videos you guys make are off the chuggin' charts.

[@teddyroosevelt79]

I'm not even Kevin and you made my balls blush.

[@andruucspr7466]

Woah woah woah. Don’t forget I Did a Thing

[@solidacid1337]

@@andruucspr7466 I DID. He's one of my favorites too! He's made some awesome videos and things too!

[@G_____]

Colin Furze is pretty insane too

[@theburgerman]

wowza

[@user-uu5nt9xh2b]

bro the Thomas thermonuclear tank engine got me dying

[@grahamdavies8986]

What you called the center support on the door is actually what is called an intrusion beam. These beams are made of at least high strength steel, and I think some cars use ultra high strength steel. The intrusion beam is the main structural strength for doors to protect passengers from severe side impacts. That was impressive to see the knives actually cut through it. I thought for sure the knife was just going to shatter when it hit the intrusion beam but it sliced through it like butter.

[@BrazilianPegging]

Most cars less than 400mph

[@Vid_Master]

wow that is incredible, thanks for that info!

[@jonathanrosskamp324]

@@BrazilianPegging most cars heavier than knives

[@poiu477]

@@jonathanrosskamp324 I would bet the force per square inch is significantly higher over the much much smaller surface area of the impact, coupled with the cutting effect of the edges, pretty easy to guess the knife rocket would go through it.

[@de0509]

Velocitas eradico!

[@pfendi]

The Thomas the tank engine gag had me dying! Great video dude. You’re doing the stuff that I’m too afraid to do for the sake of my life and well being, and it’s epic. (Edit: tank engine not train engine. :)

[@1nhukhuctinhca417]

Thomas has seen everything, it's time for you to go

[@julianoberhofer3550]

If you want too watch it again: kzbin.infoUgkxzHOsuX1F_nZSnunySzAJEFWaFz4T_592

[@Yososhio]

i kan see the memes

[@darkboltproductions1352]

It’s Thomas the thermonuclear bomb

[@embers_falling]

My first thought was rip headphone users

[@DONKFORTRESS6956]

I like how kevin just casually made a highly lethal tank buster and then dipped

[@OneBiasedOpinion]

*remade a highly lethal personnel deleter. The R9X isn’t for hard targets. It’s meant for assassinations with minimal collateral damage.

[@maxbennett5412]

@ericajimenez741 That was a very funny part of it.

[@gengamen]

Stand behind blast shield

[@mikelopez9071]

I like how he was surprised the military stole his idea

[@wee_benjamin]

he also woke up, used the bathroom and then got out of bed

[@PenguinBrix]

Thank god that this guy is not a super villain 💀

[@mitchellbarton7915]

I love the chaotic energy he gave out at the start of the video. "Well, guess what? I can make my own and its TWICE as dangerous!"

[@simonhicken3892]

He still was underestimating the rockets power😂

[@nchtblut]

xd

[@lancewellburks9577]

That Thomas the Tank Engine rocket was the funniest thing I've seen in a while. I know it was a ton of work, but I really appreciate how you just showed all the good stuff. Great video man.

[@Darkhunter190able]

Thomas the Rocket Engine

[@julianbehrendt4357]

@@Darkhunter190able omg so true 💀

[@koiyujo1543]

Exactly lmao 🤣

[@astranix0198]

Thomas the Tank Buster

[@Chrontius]

@@astranix0198 OMFG this is criminally underrated.

[@Last_Baguette0001]

During an apocalypse Kevin is that one person you'd want on your team

[@frosthoe]

Im going to disagree solely based on the fact that kevin wont let you have your weapons until hes finished and they are just right...even if the z's are banging the door. (but the Kev will hit the button and 37 microwave magnetrons driven by garbage can sized capacitors, strategically lining the foyer will assist the Z's in heatedly departing or turning to ash..

[@thelaststraightguy990]

Him and Colin Furze, you'd be set for life.

[@aratof18]

also styropyro

[@wun_zee3599]

I'd pick all of those guys plus a few veterinarians. Those mad lads are trained to deal with "uncooperative patients" who may bite as well as have top tier improvisation skills during a surgery or something, since their patients dont always have an anatomy that's as well studied as human anatomy. Not to mention they always have their tools and such with them in their trunk so they can bring the hospital right to their patient if they can't bring the patient to the hospital

[@AwesomeProjects20]

He’s the Professor from Gilligan’s Island.

[@HudsonGouge0]

"What can you guys try at home that's not so dangerous." I think we all want the dangerous stuff.

[@mattyoung4077]

Frankly, at this point I'm surprised Homeland Security don't have a handler who knows you by name and starts every call with "Kevin, we need to have a chat about your latest video". Also, this video is basically a list of reasons for _exactly why the military thought your idea was worth stealing_

[@simmonsjoe]

You need to check out Veritasium's last video. Egg drop from space. His original plan got nixed cause a NASA scientist informed him "Uhh, that is basically a ballistic missile guidance system, I can't help you with that. It was like 90% done and in testing.

[@Tech_9332]

@@simmonsjoe Mark Rober*

[@battiestelf]

​@@simmonsjoethat was mark rober

[@TheDaringPastry1313]

@@simmonsjoe that was Mark Rober

[@Newt2799]

Wait who was it again? I don’t think I’ve heard it enough yet

[@CyanicCore]

This video already proved Kevin's sharp wit with all the cutting-edge tech, but Thomas practically killed me.

[@thatonegoogleuser4144]

💀 no comment

[@CyanicCore]

@@thatonegoogleuser4144 One right there

[@nightsong81]

He made Thomas the Anti-tank Engine.

[@freescape08]

@@CyanicCore no worries, reported as misinformation.

[@thatonegoogleuser4144]

Sorry I'm allergic to puns and dad jokes.

[@styropyro]

this is a next level mad science project. wow. an insane idea with dubious legality and grave danger from start to finish. amazing

[@PaceBOI]

hi styro i love your vids

[@JJschannel255]

Hi

[@TranceSFX]

"Today I woke up, WENT TO THE BATHROOM....and got out of bed" lmao

[@ShaqDarnell1993]

The way Thomas The Tank Engine's face became embedded into the missile after impact is haunting. Imagine finding spent missile cartridges in a war zone with Thomas's face on them...

[@xXJOEVXx]

We do, we have Pickle Hellfire Rick

[@patentedorganism1557]

Psychological Warfare

[@TheOGInsomniacGamer]

10:12

[@cidlunius1076]

It's that Skyrim mod brought to life

[@ShaqDarnell1993]

@@cidlunius1076 my god, you're right! 😂

[@Catstronautgirl]

FBI agent 1: "Should we... should we intervene this guy?" FBI agent 2: "No, no, no we can use this."

[@НикЕфремов-ц3г]

FBI agent: "Should we... should we intervene this guy?" CIA agent: "No, no, no we can use this." Fixed.

[@BeastgamerYTRP]

@@НикЕфремов-ц3г Eh the original was better

[@НикЕфремов-ц3г]

@@BeastgamerYTRP Why? FBI didn't used it yet. But CIA - do did!

[@FBIopenupbitch]

@@НикЕфремов-ц3г shut up we totally did

[@pahtar7189]

ATF agent: "We're ready to raid the facility." DARPA [Redacted]: "No, no, no. Project [Redacted] might be able to use this. [Redacted] agent: "Subjects from [Redacted], [Redacted], and [Redacted] are viewing the video. Initiating traces."

[@Devisidev]

The first 2 minutes alone is incredibly dubiously legal at best. I love this channel

[@Boeing_7-VH-VXE]

"i melted down some R O C K E T on low heat and then added some F U E L to it". 0:44

[@Abrams17]

LOL

[@loomloom-productions3755]

God i love how he went from a perfectly sane science man in his early days to a mad scientist who’s gone completely insane, god do i love this man lmao

[@derekpalm9919]

hes a florida man....

[@CobraDBlade]

I can only imagine what you would be able to achieve if you and the channel Ordinance Lab joined forces.

[@TheI_OOT]

and 'i did a thing' be he is just reckless

[@john_barnett]

@@TheI_OOT and a tosser

[@KLTTLO]

@@TheI_OOTwhat about action lab.... he would probably make a earth vacuum and suck out all air on earth

[@tomothybahamothy]

Best collaboration suggestion I've seen, all these science channels could create a truly spectacular display

[@ARSZLB]

an "ordinance" is a law/bylaw usually enforced by some sort of regulatory agency. "ordnance" is the word you meant to use, which refers to explosives/bombs and the like. simple mistake, very commonly made.

[@rm3141593]

Thanks! It's so impressive for one man to be so skilled as a scientist and humorous video editor!

[@TheBackyardScientist]

Thank you so much!

[@cronch307]

@@TheBackyardScientist 🎉

[@Bandana_Bandito]

@@TheBackyardScientist So I'm nowhere near a rocket scientist by far... but on the tail end of a rocket where the nozzle is, why does the wide end of the nozzle need to be at the end? I would like to think that if you turned the nozzle around you would get more thrust out of a rocket because all that force would be a lot more concentrated exiting a narrow outlet rather than a wider opening... does that make more sense? Can you or someone on here explain why rockets are not designed like that?

[@Unknown10184]

"Thomas the military grade knife missle" going at 400mph 💀

[@ThomasTheThermonuclearBomb]

It is an honor to be launched by Kevin

[@Ragnarok0312]

See, when I saw it, I was thinking Thomas the Tankbuster 😂

[@Physcowrld]

@@Ragnarok0312 No it’s Thomas the tankfucker

[@skippy6875]

Thomas the shank-engine

[@gopalakrishnagk7979]

7&8 rockets before take off 🫡

[@ApolloFirearms]

Thank you for your sacrifice.

[@HeyItsMeDave]

There’s only one KZbin channel that makes me grin ear to ear for every minute of every video. It’s you, Kevin. This was one of my favs. Thank you!

[@Nicksperiments]

I wonder how many zombies that rocket would go through

[@ClevrYogi]

Thirteen straight dude

[@ClevrYogi]

Like kleen through

[@peacefulsoysouce2869]

now we need this and Mark's precision-guided missile combined

[@WhiteNorth]

I don't think how-to videos for terrorists is a good strategy.

[@loatherd]

@WhiteNorth Terry’s like the spread of an ied so anything in the homing category is too fancy lol

[@Skylikesavation]

That would be highly illegal

[@AmirKhan-ky2cz]

@@WhiteNorth I'm actually a wanted terrorist in Syria and I'm watching this.

[@123pantburk]

mark who

[@jeremiahchavarria]

The mixture he made is melted sugar and potassium nitrate 1 melt the sugar then pt 2 pour it into a mold 3 put it in the body of rocket (or the mold used to solidify the mixture) 4 light it up and have fun.

[@God-ch8lq]

how do u know that is his method also if u do this, add 5% red iron oxide (aka rust) for better burn rate

[@kashskitchen7178]

What’s the ratio

[@God-ch8lq]

@@kashskitchen7178 ok, so 1. sorbitol works better than regulsr sugar, cuz it doesnt caramelize when u fire the rocket 2. the commonly cited ratio is 13:7 oxidizer/fuel ratio 3. dry heating like OP recommended is sub-optimal, u wanna dissolve both oxidizer and fuel in water, and then heating it until the water is gona and the mixture is molten the melting point of KNO3 is 334⁰C, common kitchen sugar is sucrose, it doesnt melt, instead it decomposes at 186⁰C sorbitol melts at 94⁰C, and doesnt decompose from heating very much if u dry-heat the mixture, the potassium nitrate doesnt melt, and u have microscoping grains of oxidizer surrounded by partially decomposed sugar, which is not the best for performance if u melt both and mix, u still will get a very inconsistent rocket mix if u dissolve both in water, you get an even mix

[@5stringaustin]

12:30 - the propane tank spinning right towards the camera - amazing!! This is one of your best all time!! 🔥🔥🔥

[@redsquirrelftw]

That was awesome. I am honestly surprised the knife was able to cut through so many things even the framework of the car door, that's quite impressive. Shows how much power was behind those rocket motors.

[@SeventhGod77]

It’s amazing what a couple hundred miles per hour can do.

[@billhopen]

@@SeventhGod77 exactly...velocity cubed....have you seen the 500mph pingpong ball that goes through a pong paddle, destroying it

[@waynehale66]

Mixed with speed a lot of things might penetrate mostly everything I think?

[@pareidolia6]

At the speed they were going it starts to become less cutting and more crushing its way through whatever is in its path

[@internetmike]

"this morning I woke up, went to the bathroom, and got out of bed" is hilarious

[@rippilot2113]

Had to rewind to make sure I heard it right lmao

[@greyvr4336]

@@rippilot2113 Also noticed. Someone tell him to get out of bed first.

[@SpeedyFire-c8u]

So he got up but not out of bed and went to the bathroom some how then got out of the bed?

[@greyvr4336]

@@SpeedyFire-c8u No, he 'used the bathroom' without getting up.

[@michaelgarcia2050]

I didn't even catch that!

[@p0is0n49]

dont ever let this man be a nuclear rocket engineer

[@SirThanxalott]

This man is an absolute legend, bringing a nostalgic show into the picture, and also playing the coffin dance for all those lost rockets man. Absolutely phenomenal

[@gxlorp]

Most videos like this are either misleading, or not _thaaaaaat_ interesting. But *this.* It's even naturally faced paced, where other shmucks make smash cuts to hijack 12 year Olds dopamine system, to make a cash grab. It takes a lot of intelligence and craftsmanship to do this. But the end product is comedic and exciting in the sane vein as a Jackass skit.

[@Weisz]

This is incredible, one of my favorite vids ever from you

[@donutplays9124]

With Mark building a predator missile, and now this, I did not realize we were entering into the "KZbinrs recreate weapons of war for fun" Era

[@teopalafox]

Who’s mark

[@donutplays9124]

@@teopalafox Mark Rober

[@teopalafox]

@@donutplays9124 oh yeah, the egg video

[@DylanGloria-c9k]

"Today I woke up, went to the bathroom and got out of bed" is crazy. He was so determined he went to the bathroom before getting out of bed😂💀

[@puuhapeteification]

This is S tier stuff right here! Brilliant, crazy idea, great memes and lots of explosions. What else could you ask for?

[@Chris.Pontius]

An FBI raid.

[@John_C_J]

Nukes

[@gustavodeoliveiraferreira3796]

Thomas the ninja missile

[@boneheadinc1350]

9:16 in britain we call this "thomas the shank engine"

[@jaebob]

Of course

[@SeraphimAndFriends]

Thomas, Thermonuclear Bomb

[@paulsantiago2576]

9:15

[@paulsantiago2576]

9:27

[@paulsantiago2576]

9:15 - 9:27

[@billyfraiser6298]

This is the first video I've ever seen from this channel. I clicked on the channel, to look at the videos....and I found one common theme between all of them. They are nice short videos. No 25-60 minute videos, filled with useless crap. The editing this guy does with his videos is spot on, and much appreciated.

[@maxfax1012]

As a viewer for years, I'm glad you found this Florida man.

[@liamgilham]

If it's so well edited and scripted.... Listen to the first sentence again more closely lol

[@maxfax1012]

@@liamgilham ha lmao

[@hihellothere9569]

But I like the useless crap :(

[@geraldlynn1827]

This guy is awesome. Reminds me of my Estes rocket days. I had a 110 camera in one and got 5 high altitude pics. Great job !!

[@DanielAbbey-v8l]

I loved the Thomas rocket part. It had me on the floor laughing so hard 😂

[@brentgroen3204]

10:00 Damn the rocket even cut that tree

[@niravmansukh6134]

Poor Mr hamburger

[@CheezeWuz]

you know.... the fact he made his own rocket fuel and cones, and they work is really impressive

[@theflamecoreguy7929]

@@billwilliam6869 but u still need so much perfection with that nozzle and fuel tho even he managed to keep hole in middle of the rocket motor fuel that's very impressive I was never able to do that

[@klartext5806]

Do you know how he mixed the fuel or what it's called?

[@kittenwizard4703]

@@klartext5806 no, and he would be breaking several federal laws by disclosing that information

[@klartext5806]

@@meetkilla4941 broo😭

[@klartext5806]

@@meetkilla4941 🤣

[@drumm4173]

Fun to see how much his backyard has grown

[@matthewcox7985]

And how much has been destroyed! 🤣

[@tjontario]

😶 the way that rocket spiralled and launched off into the woods again after going through that car door holy danger batman lol

[@uncleledbetter5680]

I don't think I've ever said "Daaaaaammmmn" so many times watching one video. One of the few channels that still feels like old KZbin and what it used to be. Pure entertainment! 👍

[@xMythStarx]

AGREED FRFR!

[@glowsquidking]

Can you imagine how awkward it was to buy this many knives? The cashier was probably really concerned.

[@ShafaqIftikhar-pw9ld]

Lol true but he can say he is a chef and will be opening up his new restaurant venture

[@PigZzzZ]

Kevin probably became a regular at his local Walmart after how many knives he bought lmao

[@Balteus1]

with good reason for the concern

[@cheesy1224]

he got them online

[@ShafaqIftikhar-pw9ld]

@@cheesy1224 even better way without being asked too many questions lol

[@jasonmayne1]

“There is a fine line between a rocket and a stick of dynamite”. Pretty epic quote. Great video! Thank you. ❤

[@deez_542]

I love how this channel went from making innocent science videos to making military grade chaos machines

[@Palozon]

This is actually a perfectly illustrative experience of what the difference between a rocket and a missile is. Lockheed made a knife missile. You made a knife rocket.

[@Oznz-m5c]

One cost millions, the other bugger all. Hey Kev... ever thought of a new business model, save US taxpayers heaps....

[@Palozon]

@@Oznz-m5c I'm going to pretend you weren't making a joke and just misunderstood, because it would give me an excuse to elaborate. Missiles are guided, rockets aren't. Most of the issues BYS had were indicative of rockets, i.e. struggling to coax it into hitting the target without issue. His actual rocket engine performed great.

[@koneeche]

I feel like this is slightly targeted...

[@enderguyx2081]

@@koneeche like a missile!

[@yeetoburrito9972]

One of these knows where it is because it knows where it isn't, the other has no clue where it is and needs paracord to guide it.

[@Jay_in_Japan]

"Today I woke up, went to the bathroom, and got out of bed" Underrated part of the video 😂

[@-iceraptor-]

Yea I caught that too 😂, wake up get out of bed than go to the bathroom. 😂

[@nicorubio8290]

So true 🤣🤣🤣🤣

[@Volron]

That one had me rollin! The look on his face was hilarious. 🤣🤣🤣

[@alexbontempo2438]

This is arguably one of the best BYS videos recently, absolutely stunning 10/10

[@FunnyShortSnippets]

first reply

[@shaquanmoore7259]

Isnt anyone gonna talk bout his English😂😂 First he woke up, went to the bathroom, and got out of bed😭😭😂😂 Bro you woke up, got out of bed, and went to the bathroom.😂😂

[@JackPettit-dh3jl]

R/whooosh

[@kyrollos0208]

Playing with language like that is comedic, though. 😆

[@overwatchpronstars3277]

This man basically created his own version of the RX-9 hellfire missile

[@ChokyoDK]

He went from making melted salt blow up in an aquarium to creating military grade missiles. Amazing.

[@chrisdef15]

I’m not saying it’s not awesome. Loved this. But military grade missiles? It’s a rocket that needs a cable that failed half the time. Again loved it. But huge difference.

[@jamielonsdale3018]

​@@chrisdef15Military grade: Barely works, built by the lowest bidder with an _almost_ reasonable delay.

[@garywilliams7319]

Isn’t that what the government procurement office does? Lowest bidder and all. The vendor makes their money during cost overruns. Ha. @@jamielonsdale3018

[@lordgarion514]

You mean Hamas grade... Lol

[@joseluispalmeras9414]

One of those whom worked on your kitchen meanwhile You are esting with your family and youll se if they are Mily ir not XD

[@kirbman255]

I love the absolutely insane energy you’ve committed to, it’s incredibly entertaining!

[@gekpek3311]

His car parked behind the targets as he mentions security was hilarious

[@The_Nailsmith]

My daily dose of danger!!

[@FQP-7024]

Well it's not daily, it's more by annually

[@ieatgreenfleas]

@@FQP-7024 I was gonna say ..

[@A_King99]

@@ieatgreenfleas dam it so was I

[@MrMelo10092]

The last rocket made a thermobarbaric bomb, the propane spread out into the air, and had no oxider so it used the air. Ergo, a thermobarbaric bomb

[@TheNexusChan]

Homemade rockets are insane, and Backyard Scientist is even more insane. We love it

[@TheGamingMexican69]

I never want to hear those words in the same sentence again.

[@TheNexusChan]

@@TheGamingMexican69 Welp! I'm glad you read it and didn't hear it 😅

[@TheGamingMexican69]

@The Nexus backyard scientists makes insane homemade rockets... that's a news article waiting to happen.

[@luislongoria6621]

I've know I've seen hobby rockets that rival some of the smaller commercial versions for low earth orbit but I forget what the maximum legal altitude is. The only thing missing is the stickers

[@Row_Dogg]

What an absolute champion. He would be the best friend to have when the zombies come!

[@graygoesSkiing]

yuh 1:04

[@gaswhole]

he looks like a zombie...no colour at all

[@jenskarlsson4744]

sorry to tell u santa or zombies is not real !! sorry to spoil your emaginaton !!

[@lusciouslunk]

@@jenskarlsson4744 cope

[@nemoscoolstuff]

@@jenskarlsson4744 average santa denier

[@NoCrow]

It would be really interesting to see a version where the blades fold and deploy after the first impact. That way you could shoot it through a wall then deploy into a target on the other side.

[@justsomekidthatsinfinitely7090]

Grappling hook missile

[@Lilith-Rose]

Just like a scaled up folding blade broadhead used on bows... although impact causes them to unfold after being folded for travel

[@ChrisG1392]

Or put six more blades on the back and have it be stable.

[@yeeebayeeba4268]

Yeah and then maybe send one to russia...

[@Lilith-Rose]

@@ChrisG1392 tubular counterweight would be more effective, combined with a drag stabilisation streamer (you lose a little speed but gain a lot of stability so it's a worthwhile tradeoff for improvised projectiles)

[@DomyTheMad420]

i love how a good chunk of your viewers recognize that recipe 0:45 even so heavily redacted; that ending bit is just TOO recognizable xD

[@nul_point]

Enthusiast historician here. Actually Kevin, you have pretty much invented a bike, a marvellous one, which origins date all the way back to the antique times. It is suspected that some military engineers of Ancient Greece and Rome have came up with an idea of this special kind of heavy ballista ammunition, basically - a giant up-weighted spear with long horizontal blades attached to it. This design was, however, despite being proven _very_ efficient against mass gatherings of infantry and _especially_ against all kinds of cavalry, later abandoned due to it's enormous production costs; the blades has to be as long as possible, which required them to be foldable when launched, acting pretty much like a TOW missile featherings nowadays. Such technology back then was _extremely_ expensive, requiring a lot of higly educated specialists labor _and_ also a lot of expensive materials, while still being somewhat unreliable in combat. So, instead of this complex design, it was decided to use much shorter, hard-fixed blades, which was, despite much less efficient, proven _tremendously_ cheaper and more reliable in combat. This design was very popular among ballistas users and was only finally abandoned with widespread use of firearms, and even some time after as an extreme budget-saving feature. TL;DR the design originates around 200-300 BC, but was abandoned bc paying ~$1.4M per TOW missile isn't much of an option

[@kennymtfh8701]

Who asked?

[@randomsomewhat-kinda-quasi1065]

Admittedly, i didn’t ask but that was because i didn’t know this was a thing. Ty for this short history lesson!

[@ikillstupidcomments]

@@kennymtfh8701 I did.

[@weakpc1521]

@@kennymtfh8701 i also asked

[@camresponsibledriving2607]

@@kennymtfh8701 I also asked

[@Demdere]

10:10 thomas' face being welded to the front of the rocket is amazingly good

[@DemonicHazard258]

I wish I had even a fraction of the chaotic energy this man has radiating from every fiber of his being

[@hillaryoliver-xq4uy]

No Thomas, the train missile hit different

[@userrrrthxmas]

*“I went to the bathroom then got out of bed”* *respect*

[@Dekker3D]

I admire your dedication to needlessly dangerous and silly stunts. That impact footage looks amazing, I loved the car door bit. One moment it's fine, the next it's just got a gaping hole.

[@nidfest]

This is the kind of stuff that KZbin was made for. Excellent work!

[@thedoomofred5174]

This is the kind of stuff that keeps countries from invading America

[@Oznz-m5c]

Wait till all the evil Kevins see this....Train set for Xmas anyone?

[@womp47]

no, i dont think youtube was "made" for likely illegal and super dangerous missiles going nearly 500 mph with KNIVES attached

[@jacobenz359]

I'm listening to this on headphones, and whoever edited in Thomas the tank engine put in the effort of actually make the source go from right to left. Wow, that's awesome and over the top.

[@kyrollos0208]

Nice!