This is why potato cannons are dangerous. 

Well, that makes sense. I'm gonna paint my outdoor pipes.

So it's suntan lotion for PVC lol Cooll

Can't wait for your next upload

What type of paint? UV resistent acrylic paint?

Make videos bro

I was about to say that as well, but hey, you could probably label it as a business expense right?

Made me laugh ngl

Too funny

now that's how you transition to an ad

too bad Honey is kinda a scam.

I'd love to have one of those.

I love this!

Classic combo of gasses, great for old fashioned welding

Bring out the tater 8 pounder! tally ho lads!

So, it was the size of a Saturn 5 rocket? The potato cannon? To get into orbit it would have to reach escape velocity. Which is 6 miles a second or roughly 25,000mph.

I laughed for a good 10 minutes at that

I just started the video and haven't gotten past this spot. I was like omg. I came here for this comment.

@@lucivarsadiablo4191 happy to provide

I thought I was going crazy does he usually do stuff like that lol

lol that was funny

@Don't Read My Profile Photo L

@Don't Read My Profile Photo ok

And he has POTATO CANNONS!

Let's gooooooo!!!!!!

@Don't Read My Profile Photo ok

That's not plywood it's a metal plate.

@@FearThePegasus *inflates you, making you big and round*

how did you cross that out??

@@johnyray6801 ˙ɔıƃɐɯ

@@ChrisD__ *detaches argon hose* Not today bud

make way, mr brain is coming in

How do you make a potato cannon? Or what defines a potato cannon and what are some do's and don'ts when trying to make one, sorry if I'm asking much

He stoopeed

so youre good at making potato cannons, so a specific question. can i make a 29" barrel with a 2" diameter with a 5" long chamber 3" diameter? possibly 4" but taper it? trying to make it resemble an at4 for halloween lol

Does your roommate just randomly play with your things, trying on your used condoms???

you used deoderant as fuel?? was it powerful enough to break concret (or bones?)

I don't think it will break concrete. I did break a wooden privacy fence. It also punched a hole in a plastic dog house one time. I certainly wouldn't shoot it at a person or a pet. Not at a car or a house either. It could easily break a window.@@-jank-willson

if you made one, but used a much smaller diameter pipe, that was too small for potatoes, but just the right size for ball bearings, do you think it would 'end' somebody? AKA a homemade firearm?@@fecklesstech929

I did see a video where somebody broke a concrete slab with a potato launched from one of these. and also put molotovs in it instead of potatoes... @@fecklesstech929

What kind of potato gun? Was it compressed air or propane or was it hairspray. Because I imagine a hairspray potato gun would be far safer because pushing a potato out a barrel is far easier than blowing up outwards.

@@BenMyhillJones we usually used starter fluid. Hairspray was ok. Pneumatic would provide a more consistent power, so your safety margins could be higher

@Don't Read My Profile Photo ok

Did you say acetylene?!

We would wrap ours in bailing wire and/or fiberglass. Never had an RUD.

Thankfully, the blinking reflex is the fastes reflex we have. Eyes are precious.

Yea. I didnt use fire, just air. I didnt use PVC primer with my first. I had it around 100 psi or so when the front barrel blew off. Threw the ~1kg barrel around 10 meters or so in front of me. The air chamber shot backwards and gave my arm a good cut. I still have that scar, and this was 3 or so summers ago I'm hella lucky I didnt get hurt more

Thank god you can still see

I did the exact same thing when I built my first one

@@bagelsgarage seriously? Haha glue fumes are the hidden killer

Jesus what size pipe did you use. 2 inch copper is 30 bucks a foot, 3in 60, and 4in 90 where i live

@@user-cb1ln8vc8d 2" barrel 4" combustion chamber. It was 25 years ago, copper was cheaper back then, but I still don't pay anywhere near $30 per foot for 2" type l.

I UNDERSTAND THAT THERE ARE A LOT OF COMMENTS HERE, BUT PLEASE READ IT ! I also try to create interesting content (experiments). Will you write your opinion? dg

Damn plumbing enthusiasts with their product samples.

Wow that is a genuinely amusing story lmao

I imagine the TSA dude's just thinking "none of this is actually against the rules, but I really don't want it on the plane..."

Sorry sir but we are going to confiscate your Spud Gun parts. They have no serial numbers on them.

Same in ireland

Though Illegal, its very papular on the Philippines to celebrate new years though various degrees of safety and quality.

Ahhhhh 1972 again!

@@rdm5190 Oh to be 21 again. I wake up feeling twenty-five, look in the mirror, to shave, that reflection tells me no, I'm not 25 anymore.

He said you might not be dead

My ABS cannon is 18+ years old.

We used to use hairspray on the cannons we built in high school in the 90s

@@djhaloeight I didn't like hairspray as it gummed everything up. I had good success with a generic Dollar Store version of Right Guard deodorant.

Yeah, I have multiple 10 plus year old cannons. Never used PVC. I use aqua net hair spray and some heavy and tight fiting objects. Never had a failure

@@minter_fab_mafia Walnuts right off the tree with their husks still on will kill a deer. At least that's what I hear.

This is what they do with cevlar jackets around drive shafts /gear boxes at racing

I would never use any type of PVC at all for any DIY pressure stuff, especially close to you. One of the reasons we use HDPE for fireworks tubes...aside from a decent pressure rating...when it fails, it bulges, stretches, and then shreds.

Dunno; thats kinda what he did and the glass fiber didnt do a very good job of containing the shrapnell. In any case, such a design including the one used here wouldnt improve max pressure; infact the concentrated loads induced by the chicken wire risk substantially weakening the PVC as it gets stretched outward onto the discontinuous metal wire. Pulling a kevlar continuously braided sleeve, or maybe something like UHMWPE (though i dont know thats readily available as sleeve), would provide orders of magnitude more impact toughness than glass, for sure, and if the kevlar is epoxied on, it will provide a crapton of strength and stiffness too, so you can make it so it only blows out the ends and will be safe to hold.

Works good for hydraulic hoses with tiny wire shrapnel. It's usually nylon webbing.

Just go with a larger PVC pipe outside the one you're pressurizing...

you could probably friction fit the cap on snugly enough that it is 99.9% less likely to let go than a potato or whatever, using tape or putty or something similarly gap-filling. Look at ... uh, water distillers you can buy online, they're very leaky for the metal (copper) ones, you're supposed to either use PTFE (teflon) tape or "wheat paste" to fill the gaps in the connectors, and that has to both withstand moderate pressure *and* fairly extreme heat (steam under pressure is quite hot)

I UNDERSTAND THAT THERE ARE A LOT OF COMMENTS HERE, BUT PLEASE READ IT ! I also try to create interesting content (experiments). Will you write your opinion? dg

You just need to make sure the threads on the end cap will shear off well before the pressure gets to dangerous levels.

Impressive.

My dad would build ours out of sced 80. We would use hairspray, amd a grill igniter as well. Only we shot them off our shoulders. Obviously looking back it wasn't the safest thing but not the most dangerous either. Never had one blow up luckily

imagine a soldier launching unpinned grenades from a potato canon. the grenade would strike open as it leaves the barrel. hahahahha

Ever have any close calls yourself?

Yeah... should I be worried about putting 4500psi carbon fiber tanks on my face while shooting my rifle? (Also have a 3000psi aluminum)

4th of July every work day want more could you ask for? Bring you Kid to work day. Where do you work now?

Pick up your cross and follow Jesus! The world is quickly headed for destruction, and sooner or later you will have to sit at the judgement seat and give an account for your actions. Belief in messiah alone is not enough to grant you salvation - Matthew 7:21-23, John 3:3, John 3:36 (ESV is the best translation for John 3:36). Call on the name of Jesus and pray for Him to intervene in your life! - Revelation 3:20. Contemplate how the Roman Empire fulfilled the role of the beast from the sea in Revelation 13. Revelation 17 confirms that it is in fact Rome. From this we can conclude that A) Jesus is the Son of God and can predict the future or make it happen, B) The world leaders/nations/governments etc have been conspiring together for the last 3000+ years going back to Babylon and before, C) History as we know it is fake. You don't really need to speculate once you start a relationship with God tho. Can't get a response from God? Fasting can help increase your perception and prayer can help initiate events. God will ignore you if your prayer does not align with His purpose (James 4:3) or if you are approaching Him when "unclean" (Isaiah 1:15, Isaiah 59:2, Micah 3:4). Stop eating food sacrificed to idols (McDonald's, Wendy's etc) stop glorifying yourself on social media or making other images of yourself (Second Commandment), stop gossiping about other people, stop watching obscene content etc and you should get a response. Have a blessed day!

Compressed water? I thought water was incompressable

This man gets it. For the electric crowd, the PVC pipe is like a capacitor being filled through a resistor from a voltage source - we would have to calculate the air mass (charge) that had already flowed into or is currently flowing into it to infer the pressure.

Done this with dry ice, tons of fun! Until one doesn't go off... I agree with Adam, the scariest explosive is the one that doesn't actually explode XD

*after a few drinks and some engineering.

@@Lizlodude A BB gun will take care of the ones that don't go off. ;)

@@8180634 better be a fricken pellet gun and not something you'd give a 10 year old

@@TheHippyProductions when they are almost ready to pop, it doesn't take much to finish the job.

This is why I always stayed clear of compressed air cannons. While it seemed you could control the pressure more than using ignitable fuels, it just added another chance for something going wrong to me. I stuck to hairspray, and not clogging the barrel.

Ik heb 2 aardappelkanonnen, en er is er één nog maar een paar keer ontploft! Veilig zat!😌

@@superkip5920 net 'n paar keer...

@@Sundownnnn lol

Waarom praten we ineens Nederlands?

@@BigBodyBiggolo omdat Nederlands de beste taal ter wereld is!😀

Good thing you healed up, ear damage is no fun. Any damage isnt really but ear damage can be a menace for a while

As a "retired" long time club DJ: hear loss and ear drum rupture isn't as much fun as you might think...

@@Seelenschmiede Huh, guess I should cross that off my bucket list?

@@Seelenschmiede It was awful, felt like one of those war movies after the shell hits next to the protagonist.

Exactly this - fail safe should be the design goal.

who cares about safety?

​@@squidwardo7074 Is that you, Cyrus? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-47Yxa9IeJEc.html

How about making the combustion chamber out of metal tubing where welding and fasteners are used instead of glue?

@@iceho6460 that sir is a pipe bomb

I thought the same thing and you must have also done a prayer sesh the same time I did cuz we brought him back

@@corncobjohnsonreal LMFAO like praying is gonna make him upload a new video How come religious folk lack common sense

@@Heroo01 I FELT THE VIBES

@@Heroo01 that's so rude, I'm making a joke and you're flexing your nonreligiousness like it makes you superior. Which is funny because it's really you that lacks common sense. AND I'm not actually religious I'm doing a bit. You really thought "prayer sesh" and praying backyard scientist back was sincere! Do you realize how absurd that is, and that you took it so serious that you felt like you had to insult religious people for it! It's so funny how oblivious you were, I think, I've been drinking bleach and that messes my judgment so maybe I'm the dummy and people take the youtube comments section seriously these days, which would be a good thing, let's clean this cesspool 🌻🌻♥️😊😊😊😊😊

If one day Backyard Scientist stops uploading, I don't think it'll be because he abandoned it

2.5 to 10 times for fluid conveyance. In some rare instances it is only 1.5 but that's usually for very large diameter or ultra high pressure products. 4 times is the norm.

Hey ask him about water valves. What is their safety rating

@@thomasbarlow4223 "They are tested to 125 psi and have to remain operational and to 500 psi and must not burst or leak but don't have to work after." -My brother

PVC pressure pipe is generally designed to withstand 3.2x the rated pressure in short term rupture tests. Check out ASTM D2241 or AWWA C900.

@@fordmanfinis tell him I said thanks. I am building something and want make sure its safe. 5000psi operation pressure surely must withstand 10k psi but I couldn't see much more than double safety margin. But hey I've been wrong before....

That was a badass creation man 😎

It's mgs for metal gear solid

I would also suggest a thicker plate of cardboard for protection. Like, at least two layers :D

Plus it won't fall over sideways and hit you in the head while you're hiding behind it...

@@TheWinjin That was sheet metal

@@recksnfx611 I guess you're right, it just looked like a piece of dark wood to me, but probably it's a rusty sheet. I think it would've been better with legs :D

I UNDERSTAND THAT THERE ARE A LOT OF COMMENTS HERE, BUT PLEASE READ IT ! I also try to create interesting content (experiments). Will you write your opinion? dg

I prefer using Kevlar condoms and duct tape. You’ll never have to worry about it blowing a load right next to your face .😂

XD

I saw that happen on a Skyscraper Roof, with a bottle of HVAC Refrigerant. The boys were laying it down on its side when one slipped. The bottle spun in circles for a bit, getting faster and faster, and then launched itself off the roof. And rocketed like the missile it was between Skyscrapers down a Major Municipality's Street. And then went kerplunk in the Bay, about a half-mile away.. It was a good day to burn off some excess luck.

"A cinder block wall"???? More like a dozen cinder block walls.

@@TimeSurfer206 One of my teachers always told us the story of how he sat in his garden when suddenly a gas bottle impacted a few meters next to him. Turns out it was from a gas station 2 km away. Tipped on its side and flew off. Edit: Typos

@@whynotjustmyusername I am not at all surprised or skeptical. I grew up IN a Welding Shop: My Grandpa's.

the cap was on

Might have to give them names like "Potato Launch-inator" 😁

Oh no, Potatoelaunchinator has striken again with his Potatoelauncher 3.000!"

yes the shockwave pressure spike can be far higher than the expected average gas pressure. Plus shock loading of a material has completely different effects than static loading.

@@avroarchitect1793 haven’t people found out the perfect dimensions for the pressure wave to hit the projectile or something?

@@fungdark8270 that isn't the issue, its the spike of pressure at the wave colliding with the wall of the tube. And if the spike is too high... well we've seen the results.

And the potato cannon from the create mod

It may work

Yeah... can that happen to my 3000psi and 4500 psi carbon fiber and aluminum tanks for my rifle?

@@EC-dz4bq if you over pressure them then there is always a possibility. Always keep within the maximum allowable working pressure. There are also factors like material fatigue and tempurature cycling. Look up the data sheet on your tanks and see what or if there is a expiry for wear. If its say 10 years of use then ditch it then and get a new one, but composites are much different than stainless, mild steel and aluminum.

​@@shout_2000 I assume the burst disks would prevent that (for the most part?) My pump I use pump it up, also has burst disks. (Mine is not homemade.) Also, all my tanks are made by the rifle manufacturer. They claim to have a lifetime warranty(rifle + tanks), with proper care. So I assume I don't need to change them out? Edit: Not a sponsor, but if the tanks/rifles themselves may help answer. They are Airforce Texans, and Texan SS. Also, I have larger recharging tanks...would those be different?

@@EC-dz4bq not an expert, but I would assume that the lifetime warranty would be trustworthy, as long as you don’t do things like subject the tank(s) to over-pressure, high temperatures, long exposure to sunlight, etc.

@@gruntopolouski5919 Thank you

Was your mom ok?

@@infinitespiral4151 She died

@@sawyerh6838 you could've worded that better 💀

@@Mr.Shogun true, it made for a poor epitaph

@@sawyerh6838 how do you know?

Are you family of Juan ?

Now I want to make something that can be heard a mile away too!

The 60 psi in a 16" pipe makes me wonder if it was something like that torque vs. horsepower thing in engines. 16" of air would exert more force than 3". So less psi may be needed to burst

I am wondering if this might draw a "Destructive Device" visit from the BATFE... wouldn't be the first time youtubers have been visited.

I'd want to see a link to the news story on this before I believe it. Schedule 80 failing at just 60 psi?

how small of a shard does it have to be to not show up on an x-ray or does it just not show up at all?

@@acewmd. As far as I know, it is really hard to see, no matter the size.

@@joetuktyyuktuk8635 oh, well thanks.

Good knowledge..

True, it is much harder. But the army has come up with some pretty amazing methods for detecting non-metallic shrapnel in the last decade and they are making it to the general public

I UNDERSTAND THAT THERE ARE A LOT OF COMMENTS HERE, BUT PLEASE READ IT ! I also try to create interesting content (experiments). Will you write your opinion? dg

He tried that in the video

@@supremesloth105 He filled the cannon with water, but you can see he is using the same air line used in every other test to pressurize the cannon. The compressed gas in the line (and in the off-camera tank) is what caused the explosion.

@@nathank7989 ahh, yea that is interesting

Was involved in many pressure tests in construction. Doesn't take much to have a failure. Also have hit a few pieces of PVC pipe when excavating. That stuff grenades uncontrollably. Always cut it with a saw instead of the excavator. I enjoyed others and their potato guns, from a distance that is. I don't trust any explosives 100 percent. Seen the unexpected even in the Army, in a controlled safe environment. Energy/explosives is something to be wary of.

you're never going to get 1000 psi out of any kind of potato cannon when its not blocked

I just used metal pipes for the barrel and pressure chamber, and an air compressor. Last one I made when I was 14 could put a pretty good size dent in a car door. I only quit messing with them because I couldn't afford to make the one I wanted. Plus I'm not sure the one I wanted to make would be legal.

Lol how did you see that

@@Robododobobo i dont know💀

!

When you're relying on atmosphere for your oxygen supply, less is more when it comes to propellant.

Ditto. I tried other things here and there, but determined that hairspray was perfect. I also learned quick not to load more than one projectile...

They need to grab an ASME reference for PVC piping and look at the yield/strain curves and yield stresses vs temperature. The calculation for hoop stress is pretty simple too.

add methanol? lol

WFT are you using for propellant, I shot my spud gun off multiple times in a row. Never got hot, I had also tested it with different length barrels to see how far I could shoot. Best distance was between 500’ and 600’ with a 4” long spud, I used a street female adapter glued into a 3 x 1 1/2 coupling and a male adapter on the barrel. I could split the gun, jam the spud into the male, screw back on, without having to shove the spud down the length of the barrel. A lot easier to load and the male is just slightly smaller than the pipe , so there’s a tiny bit of space for the spud to slide. Also use a tiny amount of WD-40 for barrel lubricant and for propellant, found WD works great and doesn’t get sticky like hairspray.

PS, I’m a master plumber.

@@geneticdisorder1900 I always used the cheapest hair spray I could find (White Rain brand usually iirc). it would get pretty hot after a few shots. but not so hot you couldn't touch it or anything. Just can't fire it too fast

By the first law of thermodynamics, the pressure within a fixed-size container is proportional to number of particles (molecules of gas) times absolute temperature, so the combustion has to either produce lots of gaseous molecules, or heat the gases by a lot to increase pressure. Like to increase pressure by 10 times (say, from 1 atm. to 10 atm.), the number of co2 and h2o molecules produced by the combustion has to be 5x greater than the number of molecules consumed by the combustion and the whole thing has to heat to 2x the room temperature (~590 kelvin or ~600 °F). Solid explosives do both of those, therefore you get a detonation and a fast-moving pressure wave, but hey, if you put that in your potato canon, you already know what to expect. For anything more conventional we can assume your fuel and oxidiser are both gaseous and at normal pressure of 1 atm. (fuels such as gasoline or methanol are still gaseous, because only the vapours actually burn). With conventional fuels you can't really get a detonation unless you use high compression like inside an engine, so the pressure across your entire container will be more or less uniform, no need to worry about peaks and how to measure them. Also with conventional fuels the number of particles produced by the combustion is pretty close to the number of particles consumed for the combustion, so the only factor that actually increases the pressure is the heat. Now to answer your question: as long as you use gaseous fuel and oxidiser and don't pressurise them, the only way the pressure inside a potato canon could ever reach 10 atm. would be if your combustion heated the whole thing to 2950 kelvin (4850°F), and 10 atm. is still way below anything shown in this video. Just don't put explosives or pressurised fuel inside and you're good.

@@hitnovak i like your funny words magic man

@@hitnovakmakes sense to me. Maybe just don’t use Oxy Acetylene as your gas.

@@Binford2500 Yeah, pretty much the take-away here. Hopefully people with access to acetylene already know that.

So you mean.... bomb making instructions on youtube?