Machining a Tiny Rocket Nozzle
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- Опубликовано: 16 сен 2024
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In this video we go through the process of machining a cold gas thruster for our reaction control system (RCS) demonstrator. Mostly a manual lathe operation, apart from the last step which is made on a mill. Similar nozzles, with a much bigger expansion ratio will stabilize and orientate our homemade space capsule and volunteer astronaut in space, once the Spica space capsule separates from the main rocket booster.
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this video was so calm and brilliantly produced !!! congrats
Thank you, Benoît!
I still can’t believe that you guys build actual rockets from scratch. Like literally from scratch. Blocks and sheets of metal.
Well it's not like we have a choice of going to a home rocket depot and buying all the ingredients for a crewed suborbital launcher. :)
how do you build your rockets?
@@billymonday8388 they go to a home rocket depot and buy them
@@CopenhagenSuborbitals Too bad Jeb's Junkyard isn't an actual store.
Interesting, they remind me a lot of the V2/A4 upper chamber injector nossle, but far less complicated, looks neat for the Control system. Thank You for sharing the knowledge during this amazing journey!
Yes, pretty similar with the screw-in thread and butt-end design, though with a single channel and a diverging nozzle, of course. :)
A scuba diver would approve of these high pressures
Confirmative.
i'm a bit worried about the guy wearing gloves while using the lathe... i know it may be cold in the shop but i personaly prefer cold hands than no hands
That's admittedly a mistake. And thank you, we appreciate the concern.
@@CopenhagenSuborbitals you can just get tear away gloves for this purpose. Warmth and safety
@@Luis-eu2ow I ctually almost lost my index finger because of this. Thank God surgeory went ok and I can keep it haha
When I was a kid, 14 yo or so, I worked in a barely heated shop in sub freezing weather. I rigged a bathroom heat lamp so it warmed my hands on the lathe controls. I also had hot water for tea on the old coal stove across the shop.
Nice video. If you had a CAD model to show what you're going to build at the beginning of the video, that would be helpful context for the viewer.
Love your videos --- however, at 3:13, when you are using that rag --- really scary. You can have it catch and drag your hand/arm in. Maybe use a paper towel, or wire brush.
this makes me wanna go play some ksp
Have you flown a kSp-ica?
Not yet im still working on my skills i have recently learned to dock and stuff
@@martindssing1206 Do you use phasing orbits?
I hope someone puts a Spica replica in KerbalX!
That would be cool! It would be fun to try to make spica in ksp!
Yeah I use pashing orbits if i neet it
Awesome content! But you should never wear gloves when working on a lathe, because they could entangle themselves in the lathe chuck
Thank you for your concern, we have to agree it was a mistake.
I know those are relatively thin gloves but it still worries me.
Mistake noted! Thank you. :)
Is there anything you would like to know about these cold gas thrusters or the RCS system in general? Comment below!
We'll try to answer it in a future video.
Copenhagen Suborbitals what gasses will you be using, CO2 I’m assuming or helium? Also why not use a monopropellant?
How would you calculate and control the amount of force these thrusters would output.
@@finefondue9307 So we've talked about using Nitrogen already in this video:
ruclips.net/video/RwseRMC266A/видео.html
CO2 has lower Isp compared to Nitrogen, and Helium is quite expensive.
Monoprops: A bit more hazardous for crewed applications, also more complex.
How long did it take to machine each one on average?
what kind of meter is used to detect a change in direction and speed? Or is the prototype set to 1 variable just to see if the system works?
what is thrust levels hope to achieve with the thrusters ??
Adrian has made a dozen of different ones now, so it varies, but let's say around 50N for these test pieces at pressures between 50-200bar. For actual flight, if we go for stabilizing capsule from spinning at the limits of consciousness (I do not remember the figures, but there are NASA papers on this for trained fighter pilots) we would be looking at around 260N per thruster @ 16bar and the space capsule would have 8 of them around its circumference to allow stabilization in 3 axis.
@@CopenhagenSuborbitals very cool!
Are you building "de Laval" nozzles of optimized shape yet, or just plain conical nozzles? I noted the custom (?) reamer used to cut the nozzle shape.
Plain conical. The cutting tool is off ebay.
I wanna make my own liquids but I know I need to start with solids and hybrids first, I wish I was able to make proper nozzles and such and had the money for this stuff, sucks to be under 18
dude it really won't be that long before you are over 18...life just accelerates. I had the same problem a couple years ago. Still don't have the money for this stuff yet. You don't need to start with hybrids and solids but they are definitely simpler. Just use now as a time to study up on theory and make practice designs. If you haven't already read it I recommend "Rocket Propulsion Elements" by George Sutton.
livingcobble I am currently settling in with that actually, I wanna be an aerospace engineer that specializes in engines and propulsion so for the past few years I’ve been reading extensively and playing a lot of kerbal space program not that that does to much but it’s actually what inspired me to like this stuff
@@finefondue9307 sounds like you already have a good start! don't forget to do the math with the reading.....that's the part that takes the longest to learn(at least for me math is harder to learn than facts) I've personally never played kerbal space program but from what I've heard its great as an introduction to orbital mechanics.
livingcobble I mean occasionally if you clip parts you will fly out of the solar system at 150x the speed of light ( my record usually it’s like 2-3x but it’s rare ) but the only stuff I gotta work in that I can think of for math is nozzle design which requires calculus which idk how to do so, that sucks
@@finefondue9307 Regarding the nozzle geometry, there are good resources available on the internet. I have built my own solid-propellant motor this year as my Bc. thesis with pretty much no previous experience. Now I am helping my colleague on the hybrid rocket engine and next academic year I am planning to design and build own experimental liquid fuel engine :)
If you study mechanical engineering you will get into it very easily. And as livingcobble stated - life flies so fast when you turn into adultoood.
#First! Awsome content i also hope one day creating my own rockets :)
Thanks! And be careful! It's a very serious addiction.
I made a small one one with a paracute when i was a kid... :)
Doesn't your lathe have a half nut and lead screw? An aluminum nozzle must be a first for sure.
Is there any reason as to why rcs nozzle walls are so thick? Rocket engines have thinner walls
Only reason is that is the diameter for the valve thread to screw them in. And since these are only test pieces for measuring different nozzle and throat geometries on a test rig, we don't need to worry about making them light and do extra machining work to get them thinner.
@@CopenhagenSuborbitals got it!
I saw a guy lose his fingers (3) because of wearing gloves using a lathe! I'd of got my ass kicked by my instructor when I apprenticed as a T&D maker for doing something that stupid.
Will the RCS be used a bit in the atmosphere as well or purely in space. (Or very low atmospheric pressures)
Kerbal Chris RCS is meant for the low pressure environment to keep the capsule oriented in the right direction, so that when we’re back in the atmosphere the ballute and fins will take over maintaining stability
@@CopenhagenSuborbitals is it gonna be a re-entry style landing or will the speed be so low that the atmosphere doesn't really affect the capsule
@@softb The capsule will reach 3.5 times the speed of sound during descent before it gets back into the thicker parts of the atmosphere where the ballute and parachutes can gradually slow it down to a reasonably comfortable splashdown speed of around 7m/20ft per second.
@@CopenhagenSuborbitals ohhh ok, I just found out what a ballet is, pretty cool thing good luck!!!
@@softb Thank you!
People usually narrate the process in machining videos, why did you not?
1. Adrian is nearing the end of his internship, so time is sparse, nor is everybody happy to talk into a camera.
2. I speak little machining myself, so that wouldn't have gone well.
3. I kind of liked this fly-on-the-wall view of the whole process. :)
people are talking about this guy wearing gloves , but he is also wearing a long sleeve shirt. I would rather loose a hand than my life