Casting Sugar Rocket Fuel - Build a KNSB (Sugar) Rocket Motor - Part 5
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- Опубликовано: 16 июн 2024
- This is the fifth video in a series where I document building a KNSB-fueled rocket motor from scratch.This video will show the casting of the propellant (fuel) grains.
**This video is for entertainment purposes only, don't try this at home.**
Amazon affiliate links for some of the tools used:
Skillet: amzn.to/3Ckqiow
Silicone Spatula: amzn.to/35Hk5Hb
Scale: amzn.to/3KsEwXo
Infrared Thermometer: amzn.to/3MtucA1
PTFE Lubricant: amzn.to/3hKL9b0
McMaster Carr links to casting tools:
Shoulder Bolts: www.mcmaster.com/91259A106/
Tubing: www.mcmaster.com/5234K46/
When I was 15 (1959) I and other kids were making candy fuel just like this. Miraculously, no accidents. I pushed the cap out of spent shotgun shells which made a perfect nozzle. I filled the shell and taped the end closed. Cannon fuse and a stick taped on and I was in business. Making candy fuel and storing it allows it to absorb water, greatly reducing it's power. Enjoyed your video. Michael
Great 😅
Thanks for sharing your story. I always try to store my fuel with desiccants to reduce moisture in the fuel. I agree, I have had some motors that were under powered because of moisture.
Keep this going, glad to see you back at it. Hope everything was well.
Things are well now, thanks!
Holy smoke !! I was getting worried ! I've made a similar motor to yours and I've ground tested it flawlessly numerous times. It should take the air in a month
loved it
I have a steel wok which is constantly rusting....soon as kno3 and sugar touches the metal....you can watch it change colour providing fuel with iron oxide...
Thank you for uploading such informative videos. They are really good. Can you share the documentation of the analysis you did? It will be really helpful.
I showed the analysis in the first video on the design, check it out. It's a spreadsheet that does the calculations that I got on Richard Nakka's site I believe.
You probably just saved like 10,000 peoples
Houses or skin.. good job, safety is first with Any chemistry.. ✊️
I'm a bit of a stickler when it comes to formulas. With that said, your percentages total 101%. What I have done, is remove 1% of Kno3 replacing with the 1% of Red Iron Oxide. Is it a huge difference? Maybe, maybe not, but makes more sense to me, than 101%
Subscribed!
That looks like some good barbecue sauce
Delicious!
Awesome
Thanks sir 😊😊😊
awesome)
Just putting this out there for all the people who have asked if pla works instead of resin. As confirmed yesterday it does not. At all lol. Will probably end up either using a higer temp filament or still printing the case in pla but machining an aluminum sleeve they can cool off in and help hold their shape. Cheaper than ordering tubes. Also how are you lighting your motor? From the top of all the grains or the very bottom? I've read always light at top to prevent it from sending pressure back up the core and making it do weird things.
Good info. I haven't tried any filament, maybe ABS would work? And yes, you want to light the top of the motor for the reason you stated primarily.
@@MinuteRockets I ended up turning a case that the pla can cool off in under pressure that made it work. Abs I'm not sure. It's probably not worth it just because of dealing with the smell it puts out but the mould I made solved the problem and presses out any air pockets thers could be.
Hi, thanks for your awesome videos. Why do you devide the propellant of a sugar rocket motor into mulitple grains and not a single large segment? Can I build a 1 inch pvc motor with a combustion chamber length of 240mm with only one propellant segment, so directly cast the propellant in the pvc pipe?
The reason for the shorter grains is because the burning of the ends makes a uniform burn profile. Look up Bates grains to learn more about it. You could do a single grain but it will be progressive, meaning it will burn faster as it goes along because the hole in the middle is getting bigger. You can make it flatter with a star pattern in the middle, look up star grain for more about that.
@@MinuteRockets Thanks! can I also use normal supermarket sugar and the potassium nitrate to make the propellant and easily cast that into the grain mold?
O very nice thank you sir
😂😂😂😂😂❤ ✌️🇵🇸🇵🇸🇵🇸🇵🇸
Hi, first thanks a lot for your very instructive video. Do you have the reference of your Black & Decker heater ? I can’t find it in france
👏🏻👏🏻👏🏻👍👍👍
You don't need a heater, it is just being used as a fan (no heat) to cool the parts off. Any small fan will do, or they will cool off naturally just not quite as fast.
Particule size of sorbitol does matter. Richard nakka carried out some tests and I have too, the finer the powder, the less viscous the propellant will be
Thanks for the comment! Particle size of the oxidizer (potassium nitrate/KNO3) matters, but particle size of the sorbitol doesn't since it will be melted, there will be no particles of sorbitol in the slurry.
I believe the finer the powder, the more viscous the propellant, but at the cost of lower performance (slower burning). From www.nakka-rocketry.net/sorb.html:
It should be noted that the viscosity of the melted propellant slurry is highly dependant upon how finely of the potassium nitrate is milled. When prepared as described above, the slurry will not be fluid enough to cast, and as such it is necessary to scoop the propellant into the casting mould. The slurry will be more fluid and easier to cast if the potassium nitrate is milled for a shorter time, such as 10 seconds or less. Or if the potassium nitrate is obtained as a fine granular form (similar to table salt), it can be used "as is". The drawback is reduced performance due to less efficient combustion, lower chamber pressure, combined with a slightly longer burn time compared to propellant made with fine-grind oxidizer.
@@MinuteRockets upon further investigation, you're right. I missremembered this part, I was actually thinking about the mixing ratio😅
What material is the 3d casting tube made of? How long is the motor burn duration with and without RIO?
This is a very good demonstration on how to safely cast a sorbitol motor! I am looking forward to the test fire.
The casting tubes are Elegoo standard resin (amzn.to/3hOaHUG)
I haven't done a test with and without the RIO in a motor, but according to Richard Nakka, RIO makes it about 25% faster in open air. (www.nakka-rocketry.net/oxidex.html)
which filament did you use to print those casting molds? I'm thinking about printing similar ones in PLA, but I'm not sure they'll resist the high casting temperature
Hello, the parts were made with a resin 3d printer (Elegoo Mars) and Elegoo standard resin. I talk a little bit about resin and heat effects in this video: ruclips.net/video/q9TE2ZHLYWw/видео.html
@@MinuteRockets awesome! Thank you for your insight!
Yeah I like that scale for my dabs
👍👍
Sweet! (pun intended)
Hello, just wonder what is the function of cement colour in the propellant composition?
It's red iron oxide, which is a burn rate catalyst. More info here: www.nakka-rocketry.net/oxidex.html
I also like it because it helps me tell when the propellant is well-mixed.
What about an induction cook top since it doesn't generate heat and is fairly precise on temp?
That would probably work. I haven't used one so I don't know how hot the top of the stove/bottom of the pan get.
👍
It would be professional if u casted them in a vacuum chamber = More performance less weight and a consistent burning temperature
I am testing sugar rocket at Saturday in india i will send vedio to you
Tôi muốn biết nguyên liệu chi tiết của khối thuốc
Surely sugar would be favourable performance wise over sorbitol?
Actually they are very similar. Sucrose might be 2% better (153 ISP vs 151). However sorbitol is preferable because it does not break down (caramelize) with heat nearly as easily as sugar, so it is much easier to work with.
Hi, why do you use sorbitol? And not icing sugar or fructose or glucose!? I am curious to know why, ( i am still a noob) please. Thank you! 👍😉
Sorbitol melts at a much lower temperature and also pours much more easily. It takes a small hit to performance compared to sucrose, but you tend to get a better grain quality, which can boost reliability. You can also add 0.5%-1% Sodium Laureth Sulfate as a surfactant which will make the propellant flow like honey, though it requires a 24 hour cure time before the grain hardens enough to load and launch.
Please make Ammonium Perchlorate rocket fuel .
I plan to do that soon. Stay tuned!
Pop the eyes from frog with casting sugar as alum casting that failed to deploy on my face when I was at work (wow you don't forget anything) then after all that dissapears you have a double coffee lung with ball cancer cover the with added water it's mixed up
It's all the same story, same shit different day 😭
What is the material used for 3d printing, PLA, ABS??
This is Elegoo standard resin, used in a resin/SLA printer. www.amazon.com/ELEGOO-UV-Curing-Standard-Photopolymer-Printing/dp/B07Z986566
can you add the link of the difference between dry and melted knsb?
Hey, so I wasn't able to find that video on RUclips, and the place I found it is a private forum so I can't really share it from there. I'm going to try to reproduce the test when I get time and post it here myself. Basically the dry mix was harder to light and burned pretty mildly whereas the liquid mix burned violently and very fast.
We've done this with KNSB and other 'sugars' and the result is the same. As a mixed powder it burns slower than hot melted propellant. The hotter it is the faster it will burn. ruclips.net/video/BcuUJglxcBk/видео.html Only heat it hot enough to melt and pour...I don't exceed 225 F
Can AL be used instead of rust?
Not in the same way. AL would be a fuel, and I'm not sure that sugar fuel is hot enough to effectively use it. Some other formulas like Ammonium Perchlorate based propellant do use AL for fuel. The rust is a catalyst, so it just helps the reaction to go a little faster.
care to share the .stl for your casting caps?
Sure, I just put them on thingiverse: www.thingiverse.com/thing:5342685
All that and we didn't get to see it fly
Here's a video of the motor running:
ruclips.net/video/lVKWmAyIF7I/видео.html
These flights are with similar motors:
ruclips.net/user/shorts241FL8GbHaM
ruclips.net/user/shortssWFy1H89di8
ruclips.net/user/shortsbRl2kcieChY
Can I have the recipe for the projectile and the ingredients to make it please??
Thank you
Sure, it's on the paper in the video. You might need to pause to see it.
Why do you split up the fuel? Why not one big tube of fuel?
Using shorter grains instead of a full length grain gives a more even burn because the surface area of the fuel remains roughly constant as it burns in the core and on the ends of each grain. The geometry is called a Bates grain. If we did a full length grain, the surface area would constantly increase as the core got bigger and bigger, and the motor would produce more thrust as the burn went on, which could be a bad thing.
You're also more likely to crack a full height grain and ruin it, which is another practical reason.
I just want to say, i wish i watched this video before 4th of july lol. Ive been making my own mix of 25% sugar, 75% Kn03. Then i pour into a old pan. And i use a gasoline camp stove. On the 4th i was making my first batch(using pill bottles as measurement because i marked weights on the sides of them so because i dont have access to a scale(used my dads at his old work)) anyways i did 1 bottle of sugar and 3 of the stump remover into the pan, mixed around. I was doing this outside away from anything flamable. And it just all combusted. Lukely i wasnt burned. I was wearing shorts, t-shirt, and flipflops. Next time ill make sure to wear at least pants and closed top shoes lol. My family were sitting on the back porch just conversating as i was about 50 feet away making the batch and it went off. My mom brother, granny and dad were unphased as they are used to my shanagins. But my cousin, and aunt were freaking out. Unferstandably. Ill have to invest in a cooking thing like what you have 100% as well to help prevent that.
Glad you didn't get hurt.
when blending the elements of the rocket fuel, i actualy allways mix the fuel before puting it in the blender, and in two years no fire has been started on acident
Can we make a single grain rocket motor rather than these 4 grain
Yes, you certainly could. You would just need to adjust the motor length and the nozzle throat diameter.
Can you share the components ratio of the motor, plz
1:50
Can i used it go to space???
It's possible, you just have to scale it way up. People are working on it. facebook.com/Sugarshottospace/
Why add the screw and silicon tube in that pipe
The screw gives it rigidity and the silicone is a so it doesn't stick. You need the hole in the middle of the fuel grain to increase surface area, otherwise the fuel wouldn't burn fast enough to produce usable thrust.
helo borather tell the names of the things that u mixed pleaase please please pleaase pleeeeeeeezzzzzsssee
It's all in the video. KNO3, Sorbitol, and red iron oxide.
Màu đỏ là gì vậy bạn mong bạn trả lời
It's Red Iron Oxide that makes the fuel red. ruclips.net/video/2xVP91ZJ93o/видео.html
by chance do you share the files for printing the 3d components?
Yes, they are at minuterockets.com/downloads.php
@@MinuteRockets - Awesome! Thanks
Can someone give me the right wight on the 3 thing used here
65% KNO3, 33-34% Sorbitol, 1-2% red Iron Oxide. Adding 1% Sodium Laureth Sulfate will greatly reduce viscosity too, making it easier to pour the grain.
Công thức và tỉ lệ là gì vậy bạn có thể chia sẻ không
It's on the paper in the video, you might need to pause to read it. Also more info at www.nakka-rocketry.net/sorb.html
Chemical list and wait list give me please
It's in the video, you might need to pause on the paper. KNO3, Sorbitol, and red iron oxide.
Wouldn’t a plastic container potentially generate static electricity and ignite the mixture?
Good question. This mixture is actually pretty stable and will not ignite with just a spark. I have never seen anyone have trouble mixing this way.
i was making my fuel on a stove, but made the mistake of not using a pan, and umm i had a smoke gernade in my kitchen, the fire peoples was even called, but no majour fire
but the disaster was only when i made my 2nd batch, and my first batch more than a meter away cought on fire too from the hot ash
Sir can it work like this by potassium chlorate + sugar??
I haven't used Potassium Chlorate. I'm not sure that it's stable enough to make a propellant that is safe to store and transport.
carmelize? caramelise
Welcome to America!
Nicely done video. Suggestion, when you start heating, set the temp to 200 F and cover the skillet until all is melted. Then turn up the heat to 225 F and gently stir trying not to add air bubbles. Allowing the propellant to melt before stirring in the unmelted dry powder helps eliminate tiny air bubbles that lower the final density. Turning up the heat to 225 makes the propellant less viscous for pouring (or scooping). Here is the video link you may have been looking for. I've done this a few times with various 'sugars' and they all work the same. As a dry mixed powder, they burn relatively slowly but when hot and melted will burn in a fraction of a second in a fireball throwing propellant all over. The same as if burning a pile of black powder or a handful of apcp trimmings. ruclips.net/video/BcuUJglxcBk/видео.html
Thanks for the tips! Yes that's the video. I remembered seeing it maybe on TRF but I could not find it again.
In spanish
I mean i did it on a stove with a thermometer...
Just be very careful of any propellant that drips over the edge of the pan. If it hits the burner then the whole pot could go up in flames very fast.
@@MinuteRockets i will! i also i got a huge project coming up; i bought 19 packs of 100g of potassium nitrate and just imagine how high could i fly
Why did you melt the sugar and added kno3 .... just mix the powdered form of sugar and kno3 and mix it well .... that works absolutely fine.
Does heating up and melting the sugar make it more powerful or increase the thrust ?
I added aluminium powder in the mix and used in rocket engine and it was just fantastic.
I think it's just more consistent if you melt the sugar and you get a higher density. I have seen people who just mix the powders and pack it in and it seems to work. Just a matter of what works for you.
Perfect example of overcomplicating things. Begging your pardon, this is too complex for a humble sugar rocket.
Does anyone out there speak mumble?
I do!
Kurde jak można tak długo mówić o takiej prostej robocie?????upośledzony jesteś człowieku???czy upośledzonych szukasz żeby im to wytłumaczyć?????
You're right, your videos are much better than mine. Nice work.
You talk a lot, and you don't say anything and the video is very long.
Thanks, very helpful!
SPEAK LOUDER 😂😂😂😂
Thanks for the feedback, I appreciate it.