Shock Diamonds! DIY APCP Rocket Propellant Test Supersonic Exhaust - ElementalMaker
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- čas přidán 25. 11. 2019
- First time ever seeing shock (or mach) diamonds with our DIY APCP rocket propellant!
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Scott Manleys Video Explaining Rocket Exhausts: • Why Rocket Exhausts Lo...
Parts I used for the test stand:
Arduino Uno R3: amzn.to/2QhskRv
50Kg Load cell: amzn.to/2DVYHxo
HX711 Board: amzn.to/2lg2r5L
LCD Keypad Shield: amzn.to/2E9q6fN
5V Relay: amzn.to/2SEgqhn
In addition you will also need some jumper wires, and a 10+ foot USB 2.0 Cable - A-Male to B-Male to log the data to your laptop.
Video Building the Static Thrust Test Stand: • Arduino Rocket Motor T...
Special thanks to Luke Foley and his team for providing the reloadable rocket motor!
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Hope you guys enjoyed! It would a HUGE HELP to the channel if you save this link as your amazon homepage, so when you shop the channel gets a small kickback: goo.gl/x1ehvA Please consider helping to keep these videos coming
Thank you very much for this video ! You did an amazing job and I learned a lot. I'm happy to support you and hope to see future videos of your success . That burn was simply perfection to watch !
@The_Kansas_Kid Glad you enjoyed! New rocket videos are posted!
I loved it. I'm wondering if you tried a medium thickness epoxy. Wound the reaction even kick? If so I'd think the flowability would work in your favour. It would also make release with lube, especially grease, easier. I was also curious if you considered lubing and then wrapping the spindle with kitchen cellophane. I think it would burn clean before it could make contact with the nozzle.
Done
Those videos are lots of fun, but you should try to dissolve your solids at least partially in a bit of methanol before mixing with the resin, you will get a much better dispersion, a denser end product, and the methanol will completely evaporate long before the resin cures (it's compatible with most epoxy resins, and will dissolve both your perchlorate and nitrate). Just dissolve your solids into a bit of methanol, mix the methanol solution with the resin thoroughly, and add the hardener at the end. The methanol will also make the resin a lot easier to actually pour. For even better results pull a slight vacuum on your resin mix after pouring to get all the air and moisture and methanol out. Remember that less hardener will take a longer time to set, but will also set harder and denser, less rubbery. Also just put a single layer of saran wrap on your spindle for easy removal...
This channel is AvE meets NileRed.
Yes, spot on.
Awesome too!
Nah. This channel is ElementalMaker.
With some Explosions&Fire and Project Farm thrown in.
Love your work brother! Keep it up!
Awesome! Please continue making these rocket videos!!
Im glad you uploaded this! Amazing footage!
Thank you Isaac!
Awesome!! Good work my friend!
This was a superb burn. I really enjoyed that one.
Very, very cool, will have to research shock diamonds now.
Congrats! nice progress!
Hell yea those shock diamonds are badass!
Very fricken cool my dude! Keep up the good work! Next burn will be even better don't worry!
FINALLY THIS IS THE KIND OF CONTENT I LOVE
Well then welcome to the content you love!
use PuTTY with session logging to prevent loss of serial data when stuff goes wrong.
Another thing that could be done is to use a shield with an SD card for an extra backup.
put a camera videoing the data. At least you can read the data from the vid. My phone is my digital memory
This is a really simple solution to this problem. I hope he sees this! MAYBE add a screen recorder to the laptop as well.
I will definitely look into this! Thanks for sharing!
@@PhattyMo Let me say here that I've had mixed results reading serial data from microcontrollers with putty. For some it works beautifully, for others it fails completely (ESP8266 for instance).
I appr3ciate the little speed ups
👍 Can't bore people to death 😁
Bloody Brilliant you've made another Video my friend. I so look forward to your new videos coming out. Take Care Dude. 🇬🇧🇺🇸. X.
Thanks Bob! 👍
I can’t wait for the next test
Wicked cool 👍 love the burn videos
Trying for figure out if this is AvE with a different accent or an entirely different person.
Clearly didn't have his safety squints...😋
Omg right!? I had to really listen and I’m still not sure it’s not the same person... small world this CZcams!
The only thing that gave away that its not is he used his teeth as a wire stripper
The mach diamonds are a good indicator that you're approaching the promise land of specific impulse. Sucks that the data vanished, but I'll hazard a guess based on the video: For 43 grams of propellant burning for about 3 seconds with a specific impulse of ~100s should give an average thrust of 14 N. Plus or minus ~50% :p
Beautiful
You’re funny AF - I started watching your channel to get tips for my rockets, I subscribed for the comedy
Now that was fuggin cool. Beyond fuggin cool. We've all seen them in pictures, but seeing them being made by something handmade by a random dude in his garage(No offense, lol) is super cool. Excellent work!
AvE has a CNC. you might be able to work with him to get your parts machined
Welcome back to the LMNO maker
You should probably make two test grains at a time from now on.
I would do six at a time if I could! Unfortunately right now I only have one grain mold, I need to machine a few extra so I can cast four or so per run
@@ElementalMaker You can make it easier on yourself if you use premade liners instead of the paper wrap. But with the custom motor and mold, you would be lucky to find such liners in exactly the right size.
Data Shmata. The camera doesn't lie. You'll get it next time. Excellent video.
Not enough oooooo's in smooth to describe that burn well done EM
Oh, I don’t need to get notified when you post.....................I’m always checking!!!
Those mach diamonds show the exhaust at mach 5 to 6. :) Or about 4,200 feet per second exhaust velocity. Nice.
can we see that math for proof?
just want to confirm your work. nice job if true tho.
@@AnthonyGerdes Not exact but by counting the diamonds. Each one at sea level is ~ the speed of sound.
Sweet slow motion
Every time you strip wires with your teeth i have to laugh.
Had a buddy that used to do that all the time. Great big guy.
He was wiring some heated mirrors onto an old off hiway logging truck. He was sitting on the fender and was stripping the wires with his teeth.
Well he forgot that the one wire was hot, got a 24 volt jolt right into his teeth.
The look on his face was freaking priceless.
Oh, hey. The rocket vid was pretty decent too. LOL.
I used to fly rockets with my son, that was about 20 years ago. It was lots of fun. Need to start again.
Really enjoy your channel.
HERE SHE COMES AGAIN!
I see a notification from you and I quiver in anticipation. I think it's anticipation anyway.
Edit:. Would CV Moly work?
Some advice - to make charge release from the mould easily, use paraffin wax (melted) and allow to cool/set, then charge motor mould.
Great flame! Too bad that the data was lost. I am looking forward to the next time ;)
Very nice test, sucks that you lost the data a second time. However third times the charm. I can’t wait to see it in action on an actual rocket!
I blew out a chunk of my front tooth stripping wires. The filling never quite took, I've had them build it up like 3 times and it keeps breaking even though I don't strip wires with my teeth anymore. Just something to consider. Its a hard place to build back up with dental resin.
'That sucker hits home' lol you and me both brother
Oh man that looked sooo much better then the last trial though I know nothing about rockets more then common knowledge. That last one almost sputtered different directions and this one looked spot on. Can't wait to see it again (maybe tweeked) and see the numbers.
I'm sure its a bunch of maths to reduce those shock diamonds (even just happy to learn what those are called) to minimize them, but I'm guessing it's a function of the nozzle in/out angle and diameter?
just a thought for a lubricating agent and the inspiration thereof... i blacksmith hammers and stuff for hobby and as a punch lube i use a homemade mixture of bee's wax, graphite powder, and a VERY small amount of turpentine. i heat it all together and mix and let cool back into a very lubricative and firm wax that will smear onto anything if you want it to
*ElementalMaker* Just an idea: very fine steel wool ball will burst into red hot molten flame at 9 volts, you could make your own igniters that way.
i use old christmas light bulbs with the filaments, if you snip the glass off, they'll get hot enough to ignite things
@@solahifuefos9301 That is true and works, but try fine steel wool, it's the shiznit.
he already makes his own igniters
While those are great hacks, and work once on low starting temp fuels; a better and more reliable approach would be to get fireworks magnesium sparklers and cut small segments, exposing short contact pieces of wire when you crush the powdered magnesium. Voilá, quickmatch.
Zinc stearate is an excellent mold release
Have ya tried to wrap one of your paper liners around the center shaft might help slide off a bit easier
This is the first video of yours that I have seen. Very cool video. What is your final goal with this? Do you have a model rocket you are going to launch?
Hi..I was thinking of making a engine mold similar to what you have there and wondering if the diameter of the spindle, which makes the void in the grain, matters.
Why can't you make a paper liner on the spindle? Like you do to the outside to stop it sticking
I’m not sure what resin your using but I can make a guess. Now I know that fibreglass resin doesn’t stick to baking paper so when I cast something with a hole in like your propellant I wrap the spindle with baking paper and it very easy to remove when it’s set.
Try a sample of your resin an see if it sticks.
I don't know what kind of silicone grease you're using, but I've found that when molding stiff epoxy compositions, some of the common silicone greases (like brake lube paste) tend to work poorly for mold releases. I've found that dow corning high vacuum grease works much more reliably. Being so much stickier and tenacious, I imagine that the viscous epoxy mixture has a harder time wiping it off of the mold surfaces. The stickiness makes it a bit harder to spread out, but a spritz of naphtha momentarily helps it spread. Take it for what it's worth. It might not work for shit with resins other than what I've used.
Correct me if I’m wrong but to solve the shock diamonds you would either slow the burn rate to lower chamber pressure or increase nozzle diameter as it’s burning too fast and there’s too great a pressure differential?
I don't know if it's viable at this scale, but on larger amateur rockets (3" grain diameter) I've seen the propellant cast in place in the motor, using Styrofoam as the core. The styro is dissolved with acetone after curing.
Have you considered using a liner on your casting mold another thought was to use a two-part mold so that you can separate for demolding
Also for diemolding if you had a 2 parkour you could make retention tabs along with separating line that would be removed but would allow for corn removal to be made easier
Just curious but wouldn't it be a good idea to put the nozzle in first then the grain and cap that way your not relying on the 2 prongs to tighten the nozzle?
perhaps you could wrap some flash paper around the spindle so it doesn't get stuck. might help with even ignition as well
11:26 that laugh was hilarious!
Vice, vice, baby!
Sooooo when are you gonna build custom motors for BPS.Space's Landing model rockets ?
Amen on the old house comment! I'm redoing subfloor in the 3rd room of my house now. Looking at probably $400 so far in materials.
Oh yeah and that's getting away cheap! Paying contractors it would be four times that.
@@ElementalMaker ain't that the truth! The living room was like $400 or $500, only because I didn't replace the carpet, and didn't have to do much blocking and such. I just reused the carpet. Also painted the subfloor to protect it from future spills and such.
I replaced 4 sheets of drywall, one window, 3 panels of siding, all the insulation, etc. I think that whole section burned about $1500. And that was 95% done only by me. Mu father helped install the siding, because that was a 2 person job. I loved it and hated it at the same time.
@@ElementalMaker I was talking with a contractor, and he said the living room probably would have been about $8-$12k to have him do it. Not worth it on a house I bought for $75k (although it's apparently worth around $100k now)
Be glad it's not a boat.
"Break Out Another Thousand, Jim."
Hey man, just want to ask for the 1 grain mould would it possible for you to share the measurements for the inner diameter, outer diameter, and its height. As i'm trying to replicate it DIY for a school project. Many thanks cheers.
I might have missed the answer to this. Are you using HTPB as a resin?
If your test fails, be sure to power off the arduino, close the serial mo motor and reset it completely! I have a hunch this is why the data dissapeared! I have had my fair share of arduino IDE run-ins with the serial monitor that this is just second nature to me now! :D I hope this helps!
When is the next update In This series? Another run for data, and launch of a rocket body?
AP definitely has a distinct smell.
I made a magnesium/AP flash powder for shits and giggles. It gave me shits alright. The uncontained explosion was so loud, it set off car alarms down the street. It also blinded me for 15 seconds without even looking right at it. That shit would make one hell of a distress flare.
Shock diamonds are what you get in association with impact creating diamonds. Mach diamonds are the result of exhaust pressure being less than atmosphereic pressure. Looks like a good formula for your grain.
They are different?
How?
Can you share some literature where i can study the differences?
I wonder what decibel the rocket are when they fire. I know they are loud and CZcams doesn't do it justice
The current tests have been low pressure, so they are not very loud.
I couldn't tell from your setup but were you able to get total impulse?
what resins can be used, is it very specific?
what specific impulse does this propellant equals?
You should try a flourinated o-ring grease...Mcmaster-Carr has them for about $40 a tube. I haven't found a solvent yet that removes them well.
I have a suggestion.
Ive made fuel with gunpowder, and used nitrocellulose as a binder, nitrocellulose is a good fuel.
I dissolved the nitrocellulose in acetone and added the gun powder to it, and i got a perfect paste.
So this gives me an idea for a composite fuel you could try.
Melt some nitrocellulose in acetone, and then add an oxidizer, the finer mesh powder might be best.
Nitrocellulose and ypu pick the oxidizer. I was thinking potaasium nitrate, but for more energy density, you could just use a little potassium perchlorate instead. (Very powerful oxidizer)
Edit: nitrocellulose makes for a really strong binder too, its very difficult to crack, so you might not even need to worry when you take it out.
Could you explain to the world what mask specification seems? N95 A1P3.. and so on. Bye the way who is Ave?
There is a program called OpenMotor for simulating solid rocket motors, so maybe it'd be interesting to see how your actual motor performs as compared to a simulation of your motor. The best part about it is that it's free simulation software.
Would clamping it during drying prevent expansion and would that be beneficial?
I think it would help prevent expansion, and thus a more dense propellant
Could you use a sacrificial sleeve on the die post instead of relying on a mold release? For instance, wrap the center piece in a thin tissue paper or something of the sort?
That might be a viable solution! 👍
@@ElementalMaker saran wrap
You could put a layer of masking tape on the center rod, sticky side out. Or even better, a layer of cig rolling paper. It will just slide right off
you make learning fun
hahaha
Both AvE and American AvE upload on the same day? Am I dreaming?
Seeing all the issues you're having with removal, I'm surprised you haven't said fuck it and just bought and machined chunk of PTFE at least for the central core.
from where can i buy ammonium perchlorate for reasonable prices online
Why you don't use stun gun technique for ignition.
How did you made the nozel calculations
I think the calculated circumference instead of area? Circumference (C=2πr) of the 8.8mm nozzle opening is 55.29 (~60 like he said). Using the formula for area (A=πr^2) gives area as 243.28mm^2 and 124.69mm^2 respectively.
@@angelaabrams9108 are you familiar with AC motor. Can you help me.
My email
Mossad.samaha@hotmail.com
Would the etching be less if you Anodize the parts?
Very well could be. Hardcoat anodizing is quite resilient stuff
Could you please add the link where you got the resin and the Hardner from?
Pleaseeeeee
yeehaaa ELMaker has a video!
What kind of the resin are you using?
R45M Htpb resin
how do you make lamp black
You remind me of a kid in a candy store my friend. LOL. Would a dusting of baby powder or corn starch between the liner and mold wall work ? Just a thought. Toobad about the data. It looked like a great burn eh. Thanks and I will be here for the next round fella.
Wow
Black powder might not be the best to use to promote ignition as it goes off so fast. Try using some of your smokeless powder from your ammo reloading stash. It burns much longer and slower, yet with more sparks.
This is why you logg to sd-card or similar in addition to send it to computer.
You then have a backup in case stupid shit happens. Also, redundant batterys.
Still: Awesome video!
Is it possible to use potassium perchlorate instead of ammonium perchlorate? It’s what I have on hand.
Ammonium perchlorate is used because it produces all gaseous byproducts, and will generate much higher isp for the same mass. Potassium perchlorate may work, but you would need to research it thoroughly before attempting, I can't say if it would be safe or not, and in the end you'd still have a much weaker motor without the impressive flame.
@@ElementalMaker alright thank you
@@ElementalMaker this may be a silly question, but are there any chemicals I could add that would change the color of the flame or make it more impressive without sacrificing the effectiveness of the propellant? For example, is there a copper compound I could add to make the flame a brilliant blue without making it significantly less powerful
Time to invest in something more robust than a naked arduino for data? Maybe construct something more rugged. With dual channel recording from the same outnput?
how to make this mixture?????
Whats the name of that curing chamber ?
That's an old thinkgeek mini-fridge that also heats. Unfortunately they are no longer in business I think, but there are other similar ones on the market that also heat.
Mach diamond's you see them in the exhaust ! Cast in a paper tube that fits the caseing no problems!
Sweet video. I like the rocket motor videos that you make, but I would really like to see the motor in a rocket! Any plans?
You bet! 👍 Working on airframe designs
I use crisco LOL believe it or not I have also dipped my spindle in melted parafion wax , two dips l do ya
1:25
What? Is it Friday night already?
Quality contant as usual like before watching . I dont know why when i see your channel i remember that guy from AVE 😂
@Jimc
AvE (Arduino vs. Evil)
@@stanervin6108 thank you
I would still go a tiny bit smaller on that nozzle. I would love to see you test some hybrid rockets using HTPB rubber and nitrous oxide. You used to be able to get small 5-10lb welding tanks on ebay for $30-50 and getting them filled with nitrous or oxygen shouldn´t be too expensive. If your lucky you may find an oxygen concetrator used for under $100 and then you can fill your own tanks.
Here is one for $48. I also saw some motorcycle kits with 2.5lb tank, lines, and spray nozzle for $118 and a 500cc kit with 5 mini bottles for $68 which might be even better for the size motors you are working with. But a 20lb tank costs $120 if you want something that will run a little longer. You can also talk to the security guys at music venues. They confiscate them all the time and may give or sell you one for cheap.
www.ebay.de/itm/Airco-Nitrous-Oxide-5-LB-Bottle-Tank-Empty-Used/184040423922?hash=item2ad9aa01f2:g:P5kAAOSwtC1dyIOG
I suspect that 1 or 2 shock diamonds at ground level should be just about right. That should allow it to find its stride at the modest altitudes of an early prototype.
In lieu of doing something fancier, a 'backup recording' of your screen-o-data with a phone camera sounds like some good hindsight, though you've probably thought of several better ideas by now. Then again, you strip wires with your teeth. :)
Dude! I have a really cool holiday time idea! Take random food stuffs and try to make rocket engines out of them. The one that probably will have the best results (other than cool whip or mashmallow fluff) would be sweet potatoes. I already know there's enough starches/sugar in potatoes to make alcohol, I wonder if there'd be enough energy to make a solid rocket motor. All you'd have to do is dice them up into little pieces and leave them to dry out, then grind it into a powder, add oxydizer and binder and cast your grain. Viola! You've got a rocket motor!.... No clue how much energy is actually going to be there but it'd be fun to do/see as well as things like canned cranberries and whatnot.
Why not just drill three holes, stick a tapered tube in one end only so far, and blow N02 through the other end? Simple, yet effective. And much less time consuming...
@@guardsmanom134 nitrous oxide doesn't burn on it's own, it's an oxidizer, it needs a fuel to go with it. Besides, the whole point is to make a rocket grain not a bomb.
@@jaratt85 ahh. Perhaps I was unclear. The potato is the fuel. The NO2 is the oxidiser. And the tube is to direct the exhaust. I meant to say TWO holes, not three. Hybrid rocket, oldschool style.
@@jaratt85 czcams.com/video/VI8gdmjEwKc/video.html from NightHawkInLight... He explains the operating physics better than I can write it.
Ive been makimg rocket motors recently with primitive tools. Id say in total i have a success rate of 50% but recently theyve gotten more successful. (I rate by how often they get off the ground) I have some designs in inventor that i want to make, but i dont have a laythe, or barstock. Let alone a machineshop or steel/aluminum.
Aluminum is lightweight so yeah.