Burning Model Rocket Motor In Liquid Nitrogen - 4K Slow Motion
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- Опубликовано: 5 сен 2024
- I try and burn a Model rocket engine submerged in liquid nitrogen to see what's going to happen, also filming with a 4k high speed ( slow motion ) camera it should yield some interesting results, Model rockets are cool and in this case very cool, -320 °F cool, How does this work ?, lets find out.
I build a couple different rigs to see if I can get a clear view of the engine for our high speed camera and see what the high speed footage reveals.
also, take a look at the previous Model Rocket Engine episodes.
See Through Model Rocket Engine Burning - 4K Slow Motion
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See Through Model Rocket Engine - FULL ENGINE - Slow Motion 4K
• See Through Model Rock...
Model Rocket Engine In A Vacuum Chamber - 4K Slow Motion - will it burn?
• Model Rocket Engine In...
Burning Model Rocket Engine Underwater - in 4K Slow Motion
• Burning Model Rocket E...
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Watch this in 4k whether you have a 4k tv or not, it looks incredibly insane, in a good way. its awesome!
Directed By: Matt Mikka
Carbon 12
www.c12.tv
Matt Mikka
www.MattMikka.com
Dude, 0 kelvin is -273,16.
Liquid nitrogen can't be ”more than three hundred below”.
Please, the basics.
Liquid nitrogen is 77 Kelvin which is -320°F. 0 Kelvin = -459°F. Here's an article on the matter. Liquid nitrogen
en.m.wikipedia.org/wiki/Liquid_nitrogen?wprov=sfla1
"Please, the basics." 😂 you really thought you had him didn't you? 🤣 this made my day
Randy Hinds
I don't know what you mean with ”having him”.
I just couldn't carry on.
Warped Perception
Ok, my bad, I gave for granted that even you yanks were evolving to proper metric system.
Warped Perception eww, imperials
Please don't wear open welly boots when pouring LN2. If some goes in, you've lost your toes or maybe whole foot.
Nathan Barrow good point, the only reason I didn't have my rubber apron on was because it was so hot, which is exactly how accidents happen. Mostly I have the rubber boots on in case the ground beneath me got flooded in the case that the tank broke open.
Noticed that as well. Foolish.
As far as I know, this is the first time someone did something like this on RUclips, possibly anywhere on the Internet. Excellent work, dude.
BTW the casing broke because of enormous thermal difference and brittleness at cryogenic temperatures, and I think the fuel burned much faster because it was denser. Contraction occurs and it's significant in this case. Fuel grains are closer together.
a QUICK ANSWER to your question: the rocket motor burns faster in vacuum is because the ejecta dissipates faster in vacuum due to low pressure, which speeds up the chemical reaction in the combustion chamer.
+phlyming On the contrary, MOST combustable mixtures speed up their burn rate under increased temperature and/or pressure - they have positive burn coefficients relative to temperature or pressure. This is why designing motors with certain fuels (zinc-sulfur comes especially to mind) can be highly dangerous - make the nozzle the slightest bit too small, the burn rate positive-feedbacks until it blows up the combustion chamber. Zinc-sulfur has particularly wicked combustion coefficients. Which is why nobody in their right minds builds rockets that way anymore. Watch "October Sky" - that's what happens with zinc-sulfur in steel pipe. An acquaintance killed his neighbor's cow when he was a kid just that way.
Other examples: modern gunpowders burn slowly and anemically when they're not confined in a chamber. Slow burn, nothing scary. In a rifle cartridge - "BANG!". Solid rocket propellents (eg: Ammonium Perchlorate/Nitrate plus resins/plastics etc) when out of their sleeves burn slower than a road flare. Confine them and WHAM! Even blackpowder burns MUCH faster when confined. Especially quickfuse - take an ordinary fuse that takes a few seconds to burn tamely with a bit of sparkle and hiss. Now stuff it down a straw and try again - fractions of a second burn time, and probably a healthy BANG! of its own.
Rocket engines are more efficient in vacuum not because they burn faster, but because the pressure differential between inside and outside is higher, hence the exhaust gas is accelerated more, and more exhaust gas can be ejected in a given amount of time. F=MA - increase the mass flow and the acceleration, more thrust.
When the casing cracked (probably due to thermal stress, the grain of the propellant (basically solid black powder) suddenly had a lot more surface area exposed to the flame. More exposure = faster burn. I have had rocket motors that have been dropped just plain detonate because the grain was fractured. If you shoot black power weapons, look at your powder. Powder for pistols is like fine cornmeal, powder for rifles is coarser. Powder for cannon is like aquarium gravel. The finer the grain, the higher the surface area to volume ratio. Higher ratio, faster burn.
I was expecting the tank to be completely destroyed. Cool video...no pun intended.
Awesome! I love that you insulated it better at the end so we could see it! So satisfying seeing the rocket fire in Liquid nitrogen
The Action Lab not much in this world impresses me, but I thought it was crazy that you put your arm in that vacuum jar, that was absolutely nuts hahahaha...
Wow action lab
Tons of "Liquid Nitrogen" videos on RUclips but this videos ranks one of the best. I also learned that if I had doubled pane windows in my house I'm saving on my electric bill. Thumbs Up!
+Vader I was so surprised at how well that double pane window did the job. Almost unbelievable.
Feels like Sopranos Science with that accent...love it, though...thanks!
That was extremely cool!
Just putting regular stuff in a stable fishtank of liquid nitrogen and filming it in slow motion would be really cool.
LITERALLY...😜
*TRIVIA* 1.Can you spot the clip from an upcoming episode? 2.Can you guess what documentary the music is from at 0:17 ?
If I had to guess I'd say the LN thermal shocked the propellant and caused crack(s). If a solid rocket motor has cracks the combustion zone expands into those cracks causing a runaway reaction like the immediate catastrophic failure at the end.
Warped Perception Brainiac?
Boba Fett lol... Locked up abroad on Netflix
Warped Perception fuck
rave music at 0:17
CATO's are at 2:15 4:45 7:05
The first two seemed to burn fine. delay grain and all. I did not see a cato in either of those. the "boom" was the ejection charge firing (its supposed to do that) unless these were booster motors? if you want to get rid of that boom use booster motors. no ejection charge.
Third one however was definitely a cato. Here is why it cato'd
when it got as cold as the liquid nitrogen it "shrank" when it ignited it warmed back up enough to crack and separate the fuel slug inside from the "casing" holding it together.
this permitted a much larger "burn" zone which dramatically increased the pressure inside (more surface area of propellant is now burning)
Exceed the pressure the casing can withstand (likely compromised by the nitrogen as well) and boom. over pressurization and "cato"
this can happen with normal temperatures as well. its called "heat cycling"
leave some rocket motors in a hot car all day then out in the desert get real cold at night and crack. motor propellant slug seps from the casing allowing more "burn" to occur over a larger surface area creating more pressure than the case can withstand and boom. cato.
if might be interesting to try a composite motor in one of these videos. completely different fuel grains (ammonium perchlorate)
if you stick the motor in a very tight fitting metal pipe (use DUCTILE metal please or you might be making a pipe bomb) with thick walls you might be able to force the casing to "hold" and not cato. plug the rear very well too or the slug might just go out the back :-)
if you go the nitrogen route again make sure whatever metal you use stays ductile when cooled that far :-) nice thick mild steel should work. in fact if you make a nice say 2 inch steel slug and DRILL a hole in it so the motor fits nice and snug that might do the trick and no matter what happens to the metal the motor won't have enough "energy" to fracture it. ie no bomb.
in the first two shots perhaps using a fan to push the fog backwards might help somewhat with the visability?
just a thought for future projects, love your vids ^^
Warped Perception now try a small engine submerged in liquid nitrogen with a snorkel coming out above the liquid if you can’t, just for shits and giggles
Impressive! But it doesn't beat my friends and I using inverted model rocket engines as pyrotechnics for our own makeshift KISS concert back in the late 1970's.
This is how venues are burned to the ground and people get killed.
Woah that's the first time I saw fire in liquid nitrogen thanks for showing it 🙂
I enjoy seeing people have fun with science ... even if its not the most scientifically conducted experiment, it is good to see people learning stuff.
this guy puts so much into making these amazing videos but gets like no views
You were saying
@@jimmyjo1375 I WAS saying
The 1% of other gasses is from me; sorry I had too much fiber this morning.
I don't know if anyone gave you the right answer to your question why the rocket engine burns so much quicker in liquid nitrogen and the vacuum, but it's because of the principle of le Chatelier. Chemical reactions which produce a lot of heat work better and therefore faster in a cold enviorntment and reactions producing a lot of gas work better under low pressure. That's why the engine almost explodes in the liquid nitrogen. Sidenote: that could have gone downhill pretty fast with a bigger engine like you used in your vacuum video.
That was fantastic! Keep up the great work.
Those rubber boots look to me like they may be more dangerous than without. If you spilled the Nitrogen into the boot it will sit there confined within the boot freezing your entire foot- which might be a cool experiment. You could hit your foot with a hammer and break it into a million pieces!
+Dave B lol. Well I I wasn't really worried about spilling liquid nitrogen in the boot, I had the boots on in case the tank broke and flooded the area underneath my feet with liquid nitrogen, that would be more of a problem. If our audience can stomach it I would definitely be willing to get a foot of a cadaver freeze it and break it, sounds quite interesting but definitely gruesome and uncanny.
That's why I didn't use gloves (as the company told me to) when I poured liquid nitrogen in the Scanning Electron Microscope I ran. Any liquid that got on my hands just rolled off, but I knew I could recieve some damage to my hands and fingers if it got in the gloves, because it would take some time to get them off. Boots would be even worse. No way would I wear boots without pants going over them.
I was going to say the same things. Long pants over the boots.
Model rocket engine in frozen block of ice. 🌫
+bgharper omg that's a great idea, that might be interesting.
Warped Perception your videos are very well done and educational. Thanks for your hard work on putting them out.
+bgharper your welcome . Thanks
+WP Hell, you can do better than that. Model rocket engine in cubic foot of frozen dog doo. Then move up to rocket engine encased in Osmium cooled down by liquid helium. That would be a hoot.
Warped Perception if you freeze it in a block of ice do it in a vacuum freezer so the ice has no bubbles
thats now how u make a vacuum chamber! hose should be on bottom! gravity. go fig! nicevid! i enjoyed it! codys lab explains why hose shud be on bottom!
+BibiBosh good point , I didn't pull a complete vacuum here though, just a partial vacuum to help out a bit
That's so awesome how much information you can get from ultra high speed. At normal speed, it just looks like the glass knocked over after something happened.
Dude, you are really cool man!
Thanks for your video!
Thanks!
Pouring liquid nitrogen with wellies and shorts on... If you'd have spilt some into your wellies you'd have been fucked.
+6Twisted lol.. I was being careful
Guess its good the glass did not shatter from the temperature shock.
Still. I would atleast have pants on, or a rubber apron.
Believe it or not its way safer to work with LN while naked. The ladenfrost effect protects your skin from the LN adhering and burning. If i ever have to work with LN2 i always strip down to skivvies. Has paid off in the past and will again in the future. I spilled a singular DROP on a pair of jeans once and it felt like someone was driving a nail through my leg. Tiny burn, lesson learned.
@CriticoolHit - Which is why you wouldn't wear rubber boots/gloves with it because it can get stuck. Or at least if you do you should tape up your ankles/wrists so it can't get in.
I was gonna write exactly that ... most dangerous thing you did in this video - you do NOT want to spill LN2 into your rubber boot ...
Good thing you waited for the report, or that would of hurt. I knew it would work so long as the igniter end was sealed. nice
Since everyone is being "technical" in the comment section I guess I should point out that Liquid Nitrogen is not cold. Cold does not exist it is just varying degrees of "lack of heat". But cool video
Rocket Engines. No oxygen required (they bring their own.)
jfan4reva next up model rocket engine in liquid oxygen?
“Flat earth- no trolls”- great place to spread the truth!
This experiment proves that hypergolic engines would work. Love it.
Korgon2013
What's your point tho? Please explain more, more details and absolute facts plz! Thanx!
Austin Sears gladly- going there and teaching them some actual science, debating with them until it becomes clear that you have a brain and then get kicked out. I was there for a week. What a week!
Solid rocket motors do
how strange.. usually there is some point to these experiments.. here it is just to see if it will... very kid like.. I enjoyed it even at 65... thumbs up!
Love your videos btw, great camera quality and sound too.. and yay for 4K
+dan428 thank you and thanks for watching
last one is really awsome!
Do it with liquid Oxygen!!!
+nathan rubio liquid oxygen, that would be nuts, I would definitely have to get her up for that one though. A few blast Shields and a chamber will probably be in order
do it with a head butt
That would be amazing. But needs to be taken very seriously. Pure oxygen, let alone liquid oxygen, can make things burn you didn't even know could burn.
(Metal, flesh, .. ).
Lol with that much oxygen even the glass is going to catch on fire
he did - oxygen and nitrogen are the same thing - AIR!
Okay, wow. That was impressive!
(as to why the casing cracked, liquid nitrogen temperatures tend to make things quite brittle, including cardboard. Try dipping a paper towel in it, you'll see it becomes "crunchy" when you take it out.)
mate no1 cares
10:14 : He cares.
You don't? Too bad. But then, why would you reply?
Don't you have anything better than trying to be upsetting to random people on RUclips? It's not a healthy pastime you know...
+piranha031091 thanks , glad you liked it
I'm going to have to add a "yes- but..."
The biggest problem here is contraction of the fuel. Black powder contracts more than cardboard, so it cracks. Those cracks mean that the flame front can burn just about everywhere instead of just the end where it's supposed to. The end result is that all that extra power means the case is overstressed and splits.
This is a well known failure mode in black powder rockets. It's been known to happen just because motors were made on a hot day and burned in below-freeing weather.
So brittleness is an issue, just the propellant, not the casing, and it's only an issue because it shrinks.
I guess that explains why it burnt up so quickly!
Warped Perception, thank you. Good video.
you're neighbors are awesome!
With regard to the Vacuum, the explosion, or increased burn speed is caused by the burned gasses being "pulled" away from the rocket by the lack of atmosphere. In the air the exhaust gases need to be expelled from the area meaning some energy (the thrust) is used for this. In the vacuum this is provided. The removal of these gases has the knock on effect that the reaction can travel unhindered.
As others have said, in this experiment you can see the structural integrity of not only the cardboard tube, but the clay plug is also effected causing further detriment. You can see this being fired out in the slow motion shot. This allows the gases to escape causing a faster burn which produces more pressure on the weakened tube.
I think the propellant grain cracked and created a catastrophic failure of the engine. It happens a lot to D engines as they get older.
+Steve B looks like that's what happened, but this engine was brand new
The propellant grain cracked because of the rapid cooling in the liquid nitrogen. The grain contracted at different rates, cracking, and creating voids inside the propellant. That gave the rocket motor much more surface area to burn once you ignited it. The internal pressure increased at a very fast rate, and caused the casing to fail. As #Steve B said, it happens on older D engines, especially those that are not stored in controlled temperatures. I've blown up some good rockets this way. LOL.
Chaotic, but beautiful :-)
不错，非常喜欢你们的视频，可以让我们看到很多看不到的世界
Very interesting. Thanks for doing this.
Great experiment with rocket and liquid nitrogen superb video sir
very nice video and straight to the point! slow mo sounds very well designed and not too execrated, well done!
+Ocker De Bokx thank you very much !
+Warped Perception my pleasure :)
Hey guys, ive got a suggestion which might make seeing the whole process better. Try adding an angled lip that covers over the opening of the tank so that gases/liquids can still escape but prevents any of your experiments from spilling between the camera and the object of focus. Another thing to try when dealing with liquid gases, is to put a fan that blows amy smoke or vapor behind the experiment. This would definitely improve visibility .
Well the last burn was so very fun to watch. Love your experiments!
Very cool experiment! 👍
Using the second plate glass for the insulated viewing window is brilliant.
Cool! No pun intended
Well that was cool AF!
Seeing that rocket split and keep burning was crazy to see in high speed. Definitely something that happened to fast to see normally.
More reliable than a shuttle solid rocket booster at those low temperatures!
The secondary explosions were almost as impressive as the engine burns. I wonder what caused them? Keep them coming.
After burning off the propellant component in the rocket, there's a 'delay section' that trails smoke (for visual tracking) for some seconds and then the (parachute) ejection charge goes off, leaving the 2nd blast seen in the tests.
How most model rocket engines are built. You wouldn't want your chute popping out right after (near-max) thrust stops
Ahh, I see that now.
You, sir, are a madman :D
That was crazy. It seems like it would have taken a lot of work, Ingenuity, and money.
I hope the ads are compensating enough.
+Aaron Reichert it does, but there's a bigger plan in place, you will see in the upcoming months, the ads barely cover the cost to make an episode. Thanks for the feedback, thanks for watching I'm glad you like it
Interesting that the actual propellant burn didn't seem to be effected much, but the delay time before the ejection charge fired seemed MUCH longer than usual. What motor were you using for this test?
The first motor is a C8-5 and since they come in packs of 3 its a safe bet the other two were as well.
Since Nix just said a 5 second delay, then yes, the delay was extended, I make it out to be 8 seconds.
+John Cochran Blackpowder slows down when cold. This causes problems with high altitude high altitude amateur rocketry, when the ejection charge may become too wimpy to pop the recovery system. Amateur rocket fliers trying for very high altitude have to compensate for this. Which generally isn't a big problem, because the ejection charges are often DIY affairs with measured amounts of 0000 black powder (the stuff used with muzzle loaders), and so doubling it is easy. But some amateurs use different systems for this (eg: piston ejection with smokeless powders - without containment, smokeless powders aren't "fast enough" to pop the laundry on large diameter rockets).
The engine burn would have been longer and lower average thrust too. Vaporizing the LN would also be sucking thermal energy from the blackpowder->gas reaction and reducing thrust as well.
The interesting part is seeing clear evidence of nitrogen oxides in the colour of the smoke, indicating enough oxidizer present in the rocket jet to oxidize some of the LN2.
Crayzeey! 👍
I think your broken motor casing was from a greatly accelerated burn rate cased by the hot-melt glue. Those motors are just tightly packed gunpowder and their burn rate is established by the nozzle throat pressure at ignition. If you restrict ignition and build up additional pressure the resulting pressure inside the engine case will ramp up quickly. The nozzle lives in the balance between its strength and the pressure of the burning gunpowder.
Maybe put the double pane in a wall of plywood with a stand so that the fog doesnt curl around it? You are probably going to try more liquid nitrogen tests so you should have something to at least buffer the fog from coming over. You could also maybe reinforce a fishtank so all the walls not relevant to the camera are stronger while the doublepane sucks the cold from the ones that are? Having something dedicated while probably more expensive initially would save you money on buying a ton of fish tanks lol.
Edit: This method could potentially let you do liquid experiments where the liquid is forced out of the fishbowl too.
Dam i remember when i stumbled on your channel you had 1000 subscribers and now your nearly at 200k congrats 👏
jorge jasso thanks !. Yeah most of the subscribers I got this year because I really didn't post any good videos, and then I had a huge delay for 6 months due to theft, but I'm back on track now, thanks for your support
Let’s see what the NASA haters say about this one. Inert has, still having an Ignition, kinda like Hypergolic engines.... oh the pain of facts.
Well done WP!!!
That double-pane final attempt was da motts applesauce!
+Kevin Karges Thank you !
It would've been better had the insulated window extended *above* the tank rather than below. Much of the image in all shots was ruined by the fog spilling over the top of the tank and in front of the camera. A barrier above the viewing pane would've kept the fog behind the tank and not obstructed the view.
Is double pane glass something exotic in the US? In Sweden triple pane glass has been the residential standard for the last 25 years or so.
@Patrick Double pane is not uncommon and the choice for most residential windows, though the manufacturer buying them cheap from Chinese sweatshops cranks the price up to 2nd mortgage territory to install them.
So most people build with single pane and just deal with it.
Great work
After the main burn is finished, you see a green/yellow smoke come from the tank. I'm curious as to whether you have formed a compound with the nitrogen and whatever exhaust material is coming from the rocket.
Amazing. Also, nice video production quality.
Amazing video man! I always wondered how a grenade blasts, some people claim that it inflates like a balloon right before it goes off. Please help people let know what is reality and what is myth! Waiting for your next video dude! You just Rock!
Perhaps the reason the engines burn quicker in both a vacuum and in the liquid nitrogen has to do with a lack of an extra supply of oxygen to draw from outside of the engine. My guess is that when there is a supply of oxygen outside of the engine that the fuel may use some of that to oxidize which could prolong the use of the oxidizer found within the engine itself, which may create more of a controlled burn rather than a rapid burn. This principal is along the lines of air-augmented rockets. I could very well be wrong, but that's my hypothesis.
Круто и интересно, спасибо за такой контент!
hey, I really get a kick out of watching this stuff!
+chris hill happy to hear that !
Cool science notwithstanding, you were handling splashing cryo with leather gloves, and rubber boots. Literally two of the worst things you could wear when handling LN2. You would be better off with bare hands and flip flops. I don't care how fast your reflexes are, if you get LN2 into the boot, or soaking into the porous leather, you will get burned to some degree. The leidenfrost effect is your best friend here, not skin coverage.
+bigbuckoramma that's kind of true? Liquid nitrogen is wet like cold water, it's actually quite dry, for liquid nitrogen to get absorbed into a waterproof leather glove is pretty unlikely, water is the universal solvent its molecular structure is inherently wet and it is strongly attracted to other minerals and molecules liquid nitrogen does not behave quite the same, also the leidenfrost effect with liquid nitrogen on skin is so aggressive for this very reason, liquid nitrogen is not really attracted to the skin. As for the boots, I had them on in case the tank broke open and flooded the floor beneath my feet, I wasn't really worried about spilling liquid nitrogen into my boot. Thanks for the feedback this all makes very good conversation.
+Warped Perception The issue isn't how "sticky" the liquid is, the issue is mechanically trapping it against your skin. LN2 will "float" above your skin above a layer of gaseous nitrogen because your skin is vaporizing it so fast - it won't do much damage until the LN2 cools your skin down to the point where it can't vaporize it fast enough to maintain the "shield". Close-fitting clothing, ESPECIALLY of the waterproof variety is a recipe for trapping it if any gets inside.
This guy is like Shoenice's good twin.
That's perfect
i've always wanted to see if something could burn in a cryo fluid. it was awesome, thank you.
i'm really curious to see the same test in liquid helium at -452F.
+FourG63 I'm definitely going to look into that, I've never handled liquid helium, is it just boil like liquid nitrogen at room temperature?
This channel is so cool
Thank you
Very cool video
The reason for the fast burn on the last engine as well as the splitting of the casing would most likely be whar we in rocketry call a CATO (catastrophic take off) when you cooled thw engine the casing and the propellant grain contract at different rates causing cracks and gaps in the grain and between the grain and casing. This leads to more propellant burning at any given time the the casing was designed to hold causing an over pressure and bursting of the casing. It is rje main reason we try and prevent thermal cycling (going from hot to cold, cold, hot, cold) and store them in a dry cool not cold place.
Heck yeah boys.
Superb!👍
Hi warped perception, i just found this video and subscribed today. Could you please tell me what speed the slow mo camera was set at? And if you had to further speed up or slow down in editing? Thank you. Great work.
Your vacuum didn't hold lol.. that's why it didn't provide insulation
Nitrogen gas is used as an inert blanket in solvent storage tanks eg. Liquid ether tanks. The lack of oxygen prevents ignition. The rocket engine would only burn using the oxygen already present within the rocket fuel. Check the tank blanketing wiki for more info.
Can you try burning a rocket engine submerged in denatured alcohol? I would love to see that. Do it at night time too
You should have used a higher barrier that would prevent N vapor from pouring over the side from where you were filming. The N vapor obscures the view greatly.
Hey just a suggestion what if you used a strong fan to blow all the excess smoke away from the camera view for a clear video.
Wraped perception: You just never give up do you? :D Awesome vid, dude.
As to why the engine burned so quick...I'm pretty sure I saw at least part of the ceramic nozzle blow out of the engine casing. After that it was wide open. In normal condition the solid propellant is pressure limited in burn rate by the orifice the combustion escapes from. Once that's outta the way, all bets are off. It burns as fast as it can through the tube opening. I think the nozzle failed probably just from differing contraction rate, far as I know they are kinda inteference fit into the tube with a small amount of adhesive for good measure. But that adhesive can't hold it in place if the interference fit is lost or the nozzle frags. The solid propellant probably falls apart too once the nozzle is lost. I remember flying model rockets and every now and then get a bad motor that just kinda blew up on the pad and failed to climb (much) after blowing up a nozzle.
You deserve more subs
Maybe try a shield thing to deflect the splash away from the viewpoint. (some kind of tilted roof ?)
Another thing that was very interesting was in the first two tests there was a very long delay before a sudden explosion making this test deceptively dangerous if you approuched the tank too soon!.
40 seconds in, and I'm just impressed that the aquarium didn't explode from temp shock...where did you find a pyrex aquarium? LOL. Ever put cold water in a hot coffee decanter? Yeah, that. Much larger differential here. Guess I'll keep watching...
L TR yeah there's some science behind that, I didn't bore everybody with all of the testing that I went through before actually pulling off this experiment. Anything that's a continuous piece of glass even Pyrex or heat resistant will shatter, from what my testing reveal even if you pour the liquid nitrogen in to the aquarium the wrong way it'll crack. You have to literally pour the whole thing and quickly to cover the bottom and then continually poor at a slower rate as you get the aquarium filled up.
Cool! Interesting, thanks.
In real-time, the ejected liquid looked slightly odd, like extra-sparkly. In slow-mo, the flying liquid looked frozen but it was still liquid. (?) Slow-mo close-up of the boiling liquid was very cool.
Did you have to get a permit to purchase that much nitrogen?
will you please try doing that same experiment inside of aerogel?
I'm pretty certain the outside insulator only reach the liquid nitrogen temperature. The grain would have cracked well before you reach even -100F and it would have exploded upon ignition.
You should always wrap your rocket motors in tape.. I use fiber tape.. they have a tendency to explode when fired while not in a some type of extra restriction like a rocket body.
F'IN EPIC MY MAN!!!
It seems like the SPLASH of the liquid nitrogen obscured a lot of the filming. Maybe a piece of plexiglass as a shield to block it from coming over the front if you do another of these.
The ejection charge went off way sooner but the engine continued burning after the ejection charge went off. I bet the longer time sitting in the LN2 meant that the outer part of the fuel was too cold to react so the core burned through really fast and the rest of the fuel only burned after it was heated by the combustion of the core part.
The insulated glass is not using a vacuum but is purged with argon, right? I think that would also take a lot of stress off the aquariums for future experiments. Another awesome video, thanks for posting!
+T Yomama yes exactly. From what I know it is argon. I will dive deeper into this in the future.
+T Yomama thanks for watching
The burn time on model rocket engines that size are not very long. My guess on the split motor vasing is that it could not flex with the increase of pressure from the burning of the propellant heating it back up.
Fabulous. Please consider pranks using canine feces.
7:50 the final eksperimen
Rocket engine contains both fuel and oxidizer - it'll burn pretty much anywhere. Only water soaking the fuel or loss of the casing allowing oxidizer and fuel to separate would prevent ignition and combustion.