How I 3D Printed a Metal Aerospike Rocket at Home 

Yoooooooooo

I thought I would find you eventually

I’m so bored I checked the comments

BORED

Oh yeah? Im so bored Im eating marmite with a spoon!

Ahahahah

420?

lol

Integza where did you get your idea from. Because two videos ago I suggest this to you.

@@integza dang it inetzga

That would be very hard because the gears may shrink at different rates or warp slightly causing the gears to break themselves

you mean an RC vehicle? because that's as much as you could accomplish with that

Cool idea, upvoted it, buuuuut... Why not just sand-cast them out of aluminum? O.o

@@Cheebzsta aluminum has a very low Melting point

​@@Firefox-cr3jw Right. If the gear system on your vehicle is directly exposed to combustion gases your problems have already eclipsed the melting point of aluminum. ;P OPs idea is worthwhile, though. Just pointing out that there are valid ways to do that which aren't necessarily less *work* but are certainly more accessible. No specially ordered kilns required or special filaments and all the parts are easily DIYed.

tru

The nozzle isn't so much melting as oxidizing (aka burning)

Would the issue be slow rate of his oxygen supply? or is it ratio of oxygen to a non-flammable gas? Could this aerospike still work?

@@richardsuckerson49 ratio. Edit: perfect flame is just enough oxygen to fully burn the fuel. He used more oxygen than the fuel needed so he accually burned the steel away (see wiki Blowtorch, this concept is fully explained)

@@Florious420 ah that explains why on old blowtorches if you didnt give it enough gas you can see the metal burning.

Watch from 16:19-16:25 on 0.5x speed. At about 16:22 you can see the nozzle throw out of the exhaust. I don't know if this means it melted or burnt or whatever... Well, technically it did neither. The supports did, and the nozzle flew off.

Also, there are a lot of sparks and pieces of metal flaking off during the entire engine burn. I honestly don't know fully what to make of it, but I'd say the force of the burn plus the temperature is causing the metal to basically peal off. Maybe a better sintering would counteract this somewhat.

@@plzletmebefrank I'd argue that Sintering will never be the way to go for this; leave too many pores and makes the metal awful for cooling

@@vaelophisnyx9873 Yeah... That does seem likely. It also makes it so when it expands from heat, it'll kinda pop and break apart, easier to flake off, easier to peal away... Hmm. Yeah. I'd like to see exactly what that bronze looks like on the inside close up. Like if it were cut in half and then put under magnification. How solid it is, what the gaps look like.

@@plzletmebefrank Might work better at larger scale where heat dissipation (be it "into the mass" or a coolant) is a bit more manageable. Hot spot develops in small parts, not a whole lot of time to react to it in some way to prevent catastrophic failure. Not that real deal big boy toys aren't known for spontaneously going wrong... 🤣

It totally matters. If your rocket explodes due to pressure, I'd say you have an issue.

@@nikkiofthevalley Thats not what KSP taught us! If it explodes, put moar boosters around it to suppress the explosion!

Well, it's also not entirely untrue, steel _is_ permeable to temperature (i.e. temperature can make its way through steel). But yeah, "impermeable" means something can't get through, while "impervious" means it's not affected. Actually, I just had to check since I don't trust my own understanding of the english language, and at least according to Merriam-Webster both are synonymous, at least for the definition of something "not allowing entrance or passage". My second part (and yours) is correct though, when talking about something being unaffected by something else, "impervious" is the right word to use.

@Карасик Ерохин извините, в следующий раз постараюсь быть поинтереснее :P

@@LordHonkInc не беспокойтесь о нем, другие должны просто постараться не быть засранцами :/

As a fellow pedant, I salute you!

@@chemistryofquestionablequa6252 It's not pedantic, questioning people want to know.

Works too good. Materials science falls behind too. May need to be a holographic part. Somehow.

c/d nozzles are useless when the fluid is below mach 1

I think you may have won the 3d printer :D leme know if u did and what u going to make you should make a crossbow or bear trap them would be cool if you win

@@joeyidontnoyu the point of the nozzles is that they compress it to reach mach 1 at the throat, and then expand. A really small pressure could be brought to mach 1 with a small throat

@@JerryBrower the problem is most likely foremost the excess oxygen literally burning the metal away. it isnt melting as much as it just gets oxidized super fast

Makes sense too me~~:)

Yes, this right here is correct: Any plain old charcoal will work. (not the BBQ stuff with fillers, regular charcoal) To make it easily, put the cheapest untreated wood (not driftwood) in a metal can with a hole in the top on a fire or in a kiln. Roast it until the inside is black all the way through. granulate that by putting it under a rolling pin and seiving to the desired fineness.

@@notamouse5630 you mean BBQ charcoal ISN'T regular charcoal? 🤔

@@PatrickKQ4HBD They can have additives in them, afaik to keep moisture out and binders to make it less brittle. You can convert BBC charcoal to activated carbon, by burning it without the presence of oxygen, pyrolysing all the unwanted stuff to gas.

@@PatrickKQ4HBD BBQ Charcoal is not the material charcoal. It is a mixture of mostly ash and a little real charcoal powder so it burns as coals the moment its lit. Real charcoal is more often used for forging steel and similar and its only made of carbonized wood.

aah yes thats how you evolve from cutting trees from trees to tighting a bolt with a wrench which i made from maybe recycled bolt metal

My inner mechanic would enjoy that idea

Curious if layer orientation would matter after sintering like it does with just plain parts..

Or loosen a rusty bolt.

I don't know that anybody has really used a solid aluminum fuel grain in a hybrid. People have experimented with adding aluminum to wax and rubber grains but not like your are suggesting. In this case, I suppose it wouldn't be solid if you left out the sintering step, but you risk the fuel grain being too brittle, cracking, clogging the nozzle then motor go boom. The core issue to hybrids is getting high regression rates of the fuel, which is why wax based grains are generally preferred. A lot of people have spent a lot of time trying to get the right balance of physical properties with high regression rate. Honestly, might be good to try just using the printed part without baking off the resin at all. That wont really help with regression rate, and the temps would be much higher so the printed aerospike would not survive, but it would look neat. Try it with a standard graphite nozzle. I think the best answer to this particular bench top demo motor is to lower the oxidizer flow rate. Or build it up as a bi-propellant with gaseous propane, dial the O/F ratio running fuel rich, then test the aerospike nozzles.

I have questions for you. I feel like a bell nozzle would have had greater success, more likely to keep the sides cool. easier to make changes. simpler to 3d print. with a bell nozzle you might be able to print it in multiple materials like have the inside have a ablative material that would take the heat with it for its short operation cycle. how do space shuttle tiles work? can they absorb the heat if they were made the lining of the engine? is any of that possible?

@@keith3761 I have some answers. Let's see if they go with your questions. A bell nozzle I think would have the same issues of erosion and potential for combustion of the nozzle material at the throat, plus I don't know what pressure he is running and if he would benefit from additional expansion. The bell nozzle only works if you have enough pressure to choke a converging nozzle and then still have enough pressure to accelerate the flow to supersonic velocities. So that's a hard one to know for sure without a bunch of instrumentation. As far as easier to make, I'm not sure. The simpler the nozzle geometry likely the easier it will be to make in my experience. Multi material nozzles are all over in rocketry. It's popular to make nozzles out of phenolic ablative material and use some metal outer layer to give it the structure it needs to survive the pressure. I also think I recall seeing inserts for solid rocket motor nozzle throats, but I can't remember off hand what they made them out of. They were there to resist erosion from the hot aluminum oxide rich exhaust gas usually. The space shuttle tiles were not ablative from what I remember. They were a carbon carbon composite that could withstand tremendous heat and not lose their structural integrity. Given their difficulty in manufacturing I think they might be beyond the typical hobbyists capabilities to make. They mostly worked by not absorbing the heat. They were more of a heat shield. As far as using them in an engine, I suppose it's possible, but I've sure not seen it done. Most of the time they either cool the surfaces that need it, or just use an ablative material there.. I'm not sure if that's a "we've always done it that way and we aren't going to change" ,or if it's more of a " we tried that and couldn't get it to work right" situation. You would be surprised how often in the rocket industry it's it's former. I have seen a carbon fiber composite rocket combustion chamber and nozzle before. It was pretty slick. It was cooled by hydrogen leaking through the inside Lauer into the combustion chamber and nozzle liner. That was a cool bit of engineering. I hope that answered your questions, and if you have more please feel free to keep them coming. Edited to add: you are probably right that a bell nozzle would be easier to make, i forgot this was for an aerospike nozzle. Tha difficulty with the bell nozzle would be in sizing the exit. Too much and you overexpand, too small and you underexpand. You can only size the bell nozzle perfectly for one atmospheric exit pressure and throttle condition.

I am in the rocket engine business as well and I have no comment. He did a damn good job for delivering a hybrid for the lowest cost just for the sake of it.

@@mitchelwendland5195 really cool to hear about niche industry experience like this, thanks for sharing!

not one successful person made it there without first failing. it is a step in the process.

I'm not sure that last project is responsible, what with enabling people to do dumb stuff and all. Sorry if I'm wrong, tho.

Gunpoder reacts too quickly, it will just explode

@@heyitsgowcow spell check? I built a flying object from household crap. How is a rocket defined? Burning fuel propels an object by thrust. Homemade "Firework" with 6' steel bike gear cable pulled a kite up into the sky.. Rocket power??? Just asking?

You can't get gun powder, ammonium nitrate, and a whole host of other things in the EU so easily, and if you did, if you used it for this purpose it would be illegal. Model rocketry is essentially banned once you go beyond 100m. UK, not part of EU has seems more liberal about it, and also Sweden.

@@ZeroCool-vn9bd wow, here in the us, we have modle rockets that go well above 100 meters, I made one that went 6000 ft up, some people have made model rockets so good that they are essentially real rockets, they make it to the Karman line, those ones need faa approval for a specific location and need to be many miles from any population, faa makes sure it wont be in the path of a plane.

Yes, this is 100% the issue. You can tell by the flame color and sparks that it is oxidizing. Too much oxygen will destroy pretty much anything. Cooling the nozzle will not help. You want a slightly fuel rich combustion to prevent this from happening.

Or maybe it might be possible to design the engine to have a gap between the flame and the nozzle like most oxyfuel torches work

@@joshuahuman1 that would result in a significantly lower thrust.

How about making the o2 port smaller, that away less o2 coming in the combustion chamber that away it’s a richer mix or how about something that burns a little bit cooler. You won’t necessarily lose thrust this way.

Engine-rich exhaust is the industry term.

Copenhagen suborbitals basically. Also thats dangerous. and check out charlie garcia.

Making liquid fueled rockets is hard because you need to somehow pump the fuel and oxidizer against the pressure of the reaction chamber. Hybrid N2O/PMMA engines are easier for the amateur because N2O will self-pressurize at room temperature while O2 and CH4 must be pumped as cryogenic liquids.

This seems pretty cool. Agree with Estelon, check out Charlie Garcia he makes some pretty cool rocket launches

compressed CH4 could work. It might be way easier than doing a hybrid style like in the video. I wonder if he could even design cooling channels right into the engine block. Supposedly that is why most major rocket engine manufacturers are switching to some form of 3D printing.

It would be cool to see him put this aerospike motor on a hobby rocket and launch it

Oxygen is highly addictive and kills people in tens of years

@@PanDiaxik I mean yeah but without oxygen you would die instantly

Sadly Oxygen slowly kills us. Nitrogen is why we live as long as we do.

@@Kevin7557 Now seriously, you are right. Breathing pure oxygen makes organism produce toxins faster than they can be removed which leads to death much faster than breathing air.

It's also the reason we are slowly dying. see free radicals.

thats what I want to know, induction heating could bind it within seconds

Need a DIY heat source. That kiln is way more expensive than the 3d printer.

@@hexdude24 indeed, it would be nice if a microwave oven could be used

ROIGHT proper sick m8

I think your overestimating the tolerances of 3D printers on small parts

Hasn't he used a design with that before? Or has he just mentioned it a lot...?

haha, I thought it was just me.

WOW!!! now that is a very interesting concept .

I was doing my class which I left in middle to watch this video😂😂😂

um that would end up to be an explosion lol

420

Why?

sim

59mil 3 horas apos postares o video 😄 e bom ver este canal crescer 😉

Brazilian i am.

Texas: gubbermint d e n i e d

Shoveldent: work at home Aerospike engine makers:

No

Epsom salt contains nearly half its weight in water, and partially liquefies when heating. That should cause problems...

@@Nuovoswiss I was thinking the same thing. It's a penta-hydrate in store bought bags.

you'd have to bake it first to get the anhydrous form. I can think of a bunch of better salts, regular table salt would be a LOT easier

Graphite burns...

With thus amount of pure oxygen in the mix even stone will burn

Graphite oxidises... that's why you can't use a graphite dish in a torch based kiln

I’m impressed. 👍🏻

Yes

Nope do it with Peter sripol

You mean with the engines that produces way less thrust than they weigh, even without the large oxygen / fuel tanks that he feeds them from and those that explode almost every time after 3 seconds ? Sound like a good idea :)

Ramu rc

Or maybe project air

True.. but it seams like its limited to metalls with fairly low melting point. I guess incanell is out of the question

@@matsv201 I'm not sure, I personally don't see any reason why if your foundry reaches high enough temperatures that you couldn't use higher melting point metals. Layer thickness seems to be a limiting factor currently. Although I don't think the parts from this 3d printer method are homogenous enough to be used for high strength or high temperature uses. But it fits the niche of home printing for when plastic is too weak. (Although having an oven capable of this is still beyond most) For industrial aplications this is too slow and labour intensive anyway but printing with lasers and metal powder does work a lot better. Although still way too expensive for home use.

@@matsv201 Nope.. they have inconel, copper, titanium, borosilicate glass and ceramics.... hell, they even have tungsten filament..

@@squidcaps4308 but that sounds like yoy cant sinter them... then you burn up your oven

yes , awesome idea!

RS CNC 32 has a better design than MP CNC, take a look at it if you choose to go for DIY CNC.

He should talk to Ivan Miranda

i'm not sure a cnc would help at building a rocket...

That's a pretty cool idea - active gyroscopic stabilization (if that's how that works anyways)

@@birbo5603 yay, in theory I can't see a reason why it wouldn't work.

a 3d printed gimbal that can be used for dslr cameras? that would be cool and incredibly useful

@@xandarian55 I know, I'm commenting this from 2 videos ago, not at the top unfortunately :(

around me nails break before the wood does!

Nails bend...

Tough as screws is probably more apt. Wire nails are actually designed to be pretty malleable and ductile. They are designed to mainly hold alignment for shearing forces. This is why home construction uses nails mostly in line with the forces (nails align the wood and bend as needed, but keep the surfaces aligned able to transfer load). Screws on the other hand are hardened, the screw (wedge) is taking a lot of tension, but are more brittle as a consequence of being heat hardened (they break easier under shearing loads). However old cut nails were a bit different, they could hardened or not.

@@LogicalNiko i wonder if work hardening plays a role there, really old nails were forged by hand, can imagine that depending on the type of steel they'd be quite a lot harder than modern wire nails.

@@connorlewis984 but don’t break easily Bending is better than the material being rigid

If this guy had a simple mini lathe, he could have it as flat as he needed it in no time.

@@nefariousyawn yes this would be the ideal way, but I'm betting he could use blue sharpie and a pair of calipers to mark where to trim it down to and then apply a disc sander in increasing grits he might already own?

Yeah this process has less steps, but that would result in a better part fir sure

That's another hell of an engineering Prosses liquid engines are another mountain of problems. Pressure gas flow valves injectors the system to actuate them and if he is using lox as oxidiser you need a cryogenic version for each. Ther is a reason why most amateur rockets are solid fuel it's just easier you put the fuel in the tube bam rocket.

@@stekra3159 i didn't consider that. maybe a solid engine with granulat is an optan. that way you are also able to input fuel into the system while it's running

@@drohnele3741 if you are going to use liquid or gas propellantyou must do calculations to make it flyable or safe. (except cold gas thrusters)

@@emrekermen5334 isn't it enough to once calculate the ratio and then just set your valves on what you calculated?

2030 is tomorrow. With capitalism, time does not move.

We use plasma cutting tools at work to cut steel instead of tourch.

looked pretty molten to me tho with the blobs of liquid metal ;) if you actually burned the steel you'd have a whole other load of issues. the "certain temperature" for steel to burn (as with *every* material, since solids and liquids can't actually burn, only rust or smoulder) is *above* its melting point. also, quoting the page you linked: "Pure oxygen, instead of air, is used to *increase the flame temperature* to allow localized *melting* of the workpiece material (e.g. steel) in a room environment."

Yep you're right you can start cutting steel with an acetylene torch, turn off the acetylene and leave the oxygen on and it'll just keep cutting.

The struts supporting the spike weren't very thick. It wouldn't be hard for the oxygen rich exhaust to erode them in seconds given the operating temperature.

عفوا عندي سؤال ❔ ماهي المواد التي استخدمها في الطباعه

and also put a rocket on it

Tomatoes are tasty

How much does a ticket from portugal to ohio costs?

That sounds like chocolate with extra steps

Mostly false. It used to be like that before Google bought RU-vid. Now, If you upload anything that critiques anything mainstream, or questions anything at all, your content gets both demonetised and channel removed if you "violate" their vague ToS.

"Upload anything they want." Lol, that's a joke right?

@@h.cedric8157 if you don't care about google/RU-vid ad money then demonization is irrelevant.

@@TruthIsTheNewHate84 you can, just do it within the rules.

@@spokehedz you don't get my point. How are they champions of "fReE sPeEcH" when they have the means to THROTTLE, and Shadow Ban, videos? You might be too naïve to believe that Google's RU-vid never will throttle anyone. 'h3te sPeEch' is still free speech, free speech is free speech. Fools would only say otherwise. And these fools are easily hurt by mere words and critiques. Also imho RU-vid should have never been sold to Google. Unless you worked for Google, and know otherwise.

nice hair

That would be so awesome

magnets fail in high temperatures

@@carpenterbeebuzz5461 you don't have the magnet exposed to said temperatures