Rocket Cooling, Featuring the Jack-o-Rocket
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- Опубліковано 25 жов 2021
- Trying to make a Pumpkin into a rocket only sounds like a dumb idea because it is. The “rocket” is fueled by rubbing alcohol and air injected by a resin printed swirl injector. The hope was that the pumpkin would char and burn slowly where two liter bottles have quickly melted. Sadly the need for running at a low pressure and the steam being released from the pumpkin made sustaining a flame, let alone the rate of combustion required for a working rocket engine, very difficult. Maybe I’ll revisit it in like a year.
As always, any 3D printed files that I think are too dangerous are not available for download.
Music:
Skeleton Dance- Myuu
Y files- Geographer
1812 Overture (by Tchaikosvky)- Tchaikovsky - Наука та технологія
A good ablator for your nozzle is powder graphite, you can dissolve it in alchohol, soak your 3d printed parts in the solution. The grahpite will be deposited in the part and the achahol will evaporate
Nothing scares me more than a demon-infested jack-o'-lantern
The pumpkin lid would have kept on if the tape was tied all around the pumpkin, because the adhesion of the tape was not enough due to pumpkin surface being too rough. Anyway, great video, fun to watch new ideas, and Happy Halloween!!
Would be more tape than pumpkin at that point
@@IrishAnonymous01 haha true, there's always a trade-off isn't it?😩
Or due to the combustion, turned it into several dozen flaming pieces of pumpkin and duct tape. Lol
Honestly I’m just a coward haha. it was loud enough as it was and taking away the kind of pressure-release the lid provided made me scared the whole thing would explode and get police officers showing up haha
@@Sciencish Actually if you cut the lid so that pressure from the inside holds it in place and use some toothpicks to keep it there before hand then you don't have to worry about the pumpkin blowing up. The lid can be cut in a jelly bean shape with an angle that you decide will pop out before the pumpkin blows up. cutting it with a jelly bean shape will let you remove it and empty the insides out better though I think you should leave the guts inside and try to make roasted pumpkin seeds in the pumpkin!
Also I'm thinking for an ablative you could use some of NightHawkInLight's DIY Starlite mix maybe formed around cardboard molds to get the geometry right?
If you try out the pumpkin again, wrap the tape all the way around like a belt to hold the top on.
Captain hindsight and lieutenant kibitz here: tie the lid down with lots of windings of fishing line or similar to stop it from popping off while preserving the jack o lantern aesthetic.
I’m pretty impressed at the lack of charring inside the pumpkin. Now you need to shave off enough to layer a bottle with it for effective protection haha
The next video is just me using a peeler on a pumpkin and using tweezers to line a two liter bottle with it for like 3 hours, just for the whole thing to explode in a third of a second haha
I think that it's because that the combustion was pushed outside
Next up: making a carved pumpkin rocket drone to chase random children!
maybe heat a 2 liter and then fill it with high presure air to expand just large enough the you can fit a normal 2 litler inside with room for a film of liquid in it for that type of cooling you mentioned.
if it works you might want to put strips or zigzags of hotglue between the two later to keep the combustion pressure from expanding the inner bottle creating a bottleneck that stops the flow, that or just high enough pressure of a pump
For Thanksgiving you should make a rocket engine out of a turkey, it would definitely smell good
That's a great idea it would be funny seeing it fly or explode.
Since most of the pumpkin is empty, try cutting the lid in an outward diagonal angle, then push it inside, clean out the insides then pull the lid back up so that inside pressure holds it closed.
Would have been interesting to see a pumpkin that's not had the lid removed and with all the guts still inside, just with 2 holes drilled for the injector and nozzle. I reckon it would have held together and the guts would have burned up and ejected through the nozzle quite effectively.
Would love to see more trials with the sacrificial pumpkin cooling...wonder how long it would hold up while providing considerable sustained thrust
Pumpkin rocket with a reusable
launch system ;) Love the slo mo action!
Awesome man! Also in the outro I thought you were gonna segue into an ad for brilliant or skill share hahaha. Notification bell for this great video :D
NightHawkInLight has a great video about making Starlite. I think it would make a great ablator.
Stupid idea: what if evaporation cooling meet film cooling trough jacket cooling?
instead of injecting the cooler from only one spot on the top, the whole bottle has many perforation that would let the cooler soak in. Since your "weak spot" seems near the throat, that would also maybe double as mist injector rater than only cooling.
The jacket is only a way to bring the cooler where it is needed,can be replaced by tubing is you find out the spot that need cooling are quite stable
1. Nozzles for the Pumpkin!
2. Your jigsaw-lid is a neat design. Use toothpicks to keep it in place without turning it into a deadly grenade?
For Christmas I vote for a motion detected snowball launcher.
This gives me an idea for a “will it rocket series” - just throw your injector on various things and see how they perform!
This is a whole different field but it would be super interesting to see you tackle afterburning jet engines.
cut the top in a reversed angle so it can only fall down inside the pumpkin and it will seal itself (until it unseals explosively xD)
Dam bro your getting into it!! I can share some research paper that might help. Love this content and how ur using the science of combustion to understand ur rocket. Great content bro!!!
Well if SpaceX starts putting pumpkins into orbit, we know who to thank
Try starting it fuel rich and then increasing the pressure gradually. It seems like you're essentially getting a hard start due to a large amount of propellant inside the pumpkin with correct stoichiometry for a detonation.
I think a great next step to try would be to find a readily available paint that when cured acts as an ablative layer and try coating the inside of the bottle with it while still film cooling the inside
NightHawkInLight just did a great video about making this kind of material recently.
I've realised it wasn't as 'recent' as I thought, but hey. Relevant link included this time
ua-cam.com/video/0IbWampaEcM/v-deo.html
@@StormBurnX I was thinking something a lot thinner, NightHawkInLight's was more of a putty, heck you could probably pack a piece of plastic pipe with it and make a functional rocket nozzle. Unfortunately it would be very hard to coat the inside of a pop bottle.
Empty the pumpkin through the other 2 holes. Might take a bit longer and a really long spoon but then there is no lid to blow off.
45 seconds in, first video watched, I'm now subscribed...
Fit a 1 liter bottle inside a 2 liter bottle then fill the gap between the two with flowing water. It could work or it could just explode.
LOL back in the 80s I made an Iron Maiden pumpkin that I lit on fire. 🎃🔥
It would be cool to see you make an ion engine/thruster
now all we need is a hydrogen propelled candy launcher
I'd use longer straps of duct tape, starting from the bottom of the pumpkin so that the weakest point is on the opposite side of the lid, and perhaps making at least a couple of turns. Hopefully this should keep the lid in place (and finally make the freaking pumpkin blow up).
Maybe try submerging the two-liter rocket engine into an ice-cold brine. The greater temperature differential should draw more heat away from the rocket and give it a larger thermal mass to overcome before it melts.
I have used wet dough of flour, sugar, an baking powder to make a heat shield for the inside of my foundry. It bubbles an burns an turns in to an insulating carbon foam. nighthawkinlight made a video on the stuff a long time ago. When its wet, it would be easy to coat the inside of a bottle with it. But it would take forever to dry inside a bottle. It would also migrated to the low point before it does. So you whould have to do it in stages or somehow spin the bottle while its drying. It took about a week to dry a coating on my foundry. But that coating that was about 1/4th of an inch lasted over an hour.
Another awesome video!! Thanks!
Great videos as always
have you tried 3d printing a jacket? After all, your wood print seemed to handle nozzle temperature just fine...
Pulsejet pumpkin would be a great addition to plants vs zombies
I love your videos!
I liked the old thumbnail a lot better. To be honest i probably wouldn't have clicked on it if not for the flaming Jack-o-lantern. If it was up to me I'd change it back, its far more interesting.
That’s what I would’ve thought but it was underperforming. If this one doesn’t increase click through rate then I’ll change it to another version of the jack-o-lantern
That's fair. I figured like most UA-camrs you probably were just experimenting but i wanted to voice my opinion. I personally liked the original but I know its all about the views. Hope one way or another you go viral, this video was really cool.
Thanks haha, and I appreciate the input. I need to figure out how to run a discord server so I can poll people on which thumbnail is their favorite
You're welcome, thank you for responding in the first place. I know setting up a discord server is pretty simple, but running one for more than 5 people would probably be a challenge. I would love to join once you get one up and running though.
He is the one who made apple rocket and launch into Newton's head and u know the rest of story
Ditch the gas, go straight to the big boys, hho or nothing
Jet-o'-Lantern
Love the channel!
Sounds just like a pulse jet engine.
Pretty sure they make desktop CNC mills. Could get one and use that to make a proper combustion chamber. If you really want to get fancy, make a monoprop turbopump to feed fuel and high pressure air.
Give a try with a pumpkin again but this time with a long one. Stick in one end the injector and the other end is the nozzle. It's a good concept ! I would love to see if you can manage to have enough thrust to really propel itself into the air!
Instead of drilling a second hole for the rocket nozzle, maybe you could make the top hole small enough to use for the nozzle?
I love your channel. :)
Possibly silly idea for a rocket material that this video made me think of. What about plain old wood? It works as a fairly decent ablator, and could work even better if saturated with water first. Something that's both very strong but with open grain to hold more water, like oak or ash. Whether you have the tools to construct something like that is another question. 😅
More vegetable rocket motors would be cool….
Also if you don’t care about actually launching it, you can use much heavier materials, and it should be much easier to keep it from overheating.
That's pretty impressive rocket attempt for a pumpkin! I think the outer shell actually might survive if there wasn't a cut through one side to empty it out. Would you consider trying to empty a pumpkin out from just the exit nozzle? I'd praise the algo for that!
If you want to make a vegetable rocket, I feel like a different kind of vegetable would be better - say, a turnip or a large carrot. You could drill out one end to accept the injector and form a combustion chamber, and even carve in a converging-diverging nozzle. That way, you won't have the issue of a lid that keeps popping off.
Good work!
Coat the bottle or pumpkin in TBC and call it a day 🤣
What if you poked a crap load of mini holes into the bottle where pressurized fuel could enter to continuously coat every part of the surface in cool fuel?
Your neighbors are cool
I think you're the first to actually say it haha
Pumpkin pulse jet 🤔😁😈
More tape is always the answer.
What about a nozzle that sprays all the way around the outside of the fuel and air nozzle that sprays water for film cooling?
There are much worse reasons for carving a hole in a pumpkin
I’m not sure if this would work at all but, maybe try wrapping the outside of the combustion chamber with flexible plastic tubing and run water through it? But that would be inefficient because you’d need a large amount of water if you’re gonna fire it for a long time. Anyways, do you think this has a possibility of working?
Wow nice
Make a pumpkin rocket for real, not just a test!
Try to make a maintenance hall in a wall and with opposite angles (to make it hold on by pressure). And add some metal needles to hold it in place.
You may even make a pumpkin nuzzle! It would be a brilliant low-tech rocket!
Spooky rocket season 👻 👻
You could use aluminium foil. Its cheap and has relatively high thermal conductivity. You could also use some kind of spray foam to coat the inside. Something that turns to carbon so if it burns it turns to CO↓2. You could use a long thin spray nossle to properly get in the bottle for even coverage. Love the Vids :)
Isn't the pumpkin just a sponge like material, filled with liquid? Sponges does not get dry fast, so how about a sponge rocket, or make a lining of jeans to the plastic bottle?
Is there any possibility of running it without cutting open the lid? Sure, you may not be able to remove the contents inside, but how much would that affect things? If you really cared about it, you could just burn most of it away with some pure oxygen.
Have you seen the myth busters episode about the exploding sewage system? Debris can accelerate a flame front, which in this case could make the thing detonate. After that initial burst tho, anything in the chamber would hamper the air-fuel mixing I think. I don’t have access to pure oxygen and don’t want to haha, stuff is scary lol
@@Sciencish That is a good point. I haven't seen that episode and I will definitely go watch it. Polyacrylate (superglue) binds really well to skin. Perhaps use that to close the pumpkin "lid"?
A Trick or Treater repulsion device?
I wonder what the results would be if you use a more energetic fuel likes diesel
I think using vegetables for ablation is cool. maybe trying others could work. eggplant rocket?
Coconut??? It's already empty, so just drilling out the holes might be enough
fun stuff ha ha :D
Happy Algorithm
just screw the lid onto the pumkin lmao
Have you ever listen about Integza? He is trying to make a liquid fuel rocket too.
Why don't you guys make a collab?
You should use titanium water bottles... Problem solved. Oops, sorry, that's the cost-plus government contract answer.
Freedomheit :)
not much different from what uv alreadybdone but starting with a colder fuel might give u some more burn time. not sure how exactly ud be pumping this(probably a cetrifugal pump), but dry ice is pretty cheap & available. Pretty sure both EtOH & IPA can handle those temps without freezing though they do get a hell of a lot mor viscous so who knows if that would work well. might be better with some kind of regenerative preheating to keep the evaporation fast enough to sustain or u can just use that injector to inject already warm fuel
what if you tried the ablative method but with idk like pva glue and flour in layers on the inside. Cant imagine it would be too hard to coat with the right amount of tumbling/shaking
Why didn’t you just nailed the top down?
soda can-non
@Whoop!!
your poor neighbours
Can you just use the top hole, with no other holes?
Potato
I made a small (working) liquid-fueled (gaseous oxygen and 95% isopropyl alcohol) rocket engine made of copper and aluminum. If you would like me to send it to you so you can test it out. I need to make a video on it first though.
Maybe a gourd would be better?
Why not use a regulator to ramp up the pressure instead of dumping it all at once
I think you should try to make some Starlite. Nighthawk has a good video talking about it, it's basically a paste you can apply and it will burn off instead of the plastic.
Another idea that is far more complicated is adding an inner wall to the rocket, basically threading a bottle on a bottle, and then passing the fuel in-between the two bottles, down the sides, through the nozle and then ignition, that will cool the exterior using the interior bottle a way to hold the film and avoid too much evaporation (revese the water bottle with a torch experiment) and preheat the fuel before ignition.
sooooooooooo you going to post something soon?
Boy I sure hope so
@@Sciencish Thank God... Integza can only satiate my need for DIY rocketry for so long...
the first thumbnail was better
You’re the second to say that haha, I’m going to have to find a way to get y’all’s opinions on that kind of stuff. That said the first one wasn’t doing great, but this one isn’t any better so probably a whole different one next
I think you should try to make some Starlite.
It is basically a very heat resistant material.
Nighthawk shows in one of his Videos how to make it easyly.
Sans jack-o-rocket?
Trick or treat
Trick me and youll see how far you can run 🤣🤣🤣
Add a thickening agent to the film to combat it being blown away?
Heh. At XCOR about ten years ago we cut a hole in the back of a jack-o-lantern and fired a 15-lb thrust N2O-ethane engine into it. I have the still photos somewhere.
This engine:
ua-cam.com/video/yf3epd1UrZ8/v-deo.html