Same!

I totally concur with you 😉. Fascinating content and obviously very intelligent presentation. That being said it's DEFINITELY NOT A "Hold my Beer challenge" jm2c 👍

I would love to try this, but I'm just smart enough to not try it as in best case I would fail, worst die :D

Sure is!!

@@flying0graysons 👉🔴What Do Muslims Believe about Jesus? Muslims respect and revere Jesus (peace be upon him). They consider him one of the greatest of God’s messengers to mankind. The Quran confirms his virgin birth, and a chapter of the Quran is entitled ‘Maryam’ (Mary). The Quran describes the birth of Jesus as follows: (Remember) when the angels said, “O Mary, God gives you good news of a word from Him (God), whose name is the Messiah Jesus, son of Mary, revered in this world and the Hereafter, and one of those brought near (to God). He will speak to the people from his cradle and as a man, and he is of the righteous.” She said, “My Lord, how can I have a child when no mortal has touched me?” He said, “So (it will be). God creates what He wills. If He decrees a thing, He says to it only, ‘Be!’ and it is.” (Quran, 3:45-47) Jesus was born miraculously by the command of God, the same command that had brought Adam into being with neither a father nor a mother. God has said: The case of Jesus with God is like the case of Adam. He created him from dust, and then He said to him, “Be!” and he came into being. (Quran, 3:59) During his prophetic mission, Jesus performed many miracles. God tells us that Jesus said: “I have come to you with a sign from your Lord. I make for you the shape of a bird out of clay, I breathe into it, and it becomes a bird by God’s permission. I heal the blind from birth and the leper. And I bring the dead to life by God’s permission. And I tell you what you eat and what you store in your houses....” (Quran, 3:49) Muslims believe that Jesus was not crucified. It was the plan of Jesus’ enemies to crucify him, but God saved him and raised him up to Him. And the likeness of Jesus was put over another man. Jesus’ enemies took this man and crucified him, thinking that he was Jesus. God has said: ...They said, “We killed the Messiah Jesus, son of Mary, the messenger of God.” They did not kill him, nor did they crucify him, but the likeness of him was put on another man (and they killed that man)... (Quran, 4:157) Neither Muhammad nor Jesus came to change the basic doctrine of the belief in one God, brought by earlier prophets, but rather to confirm and renew it.

metal on metal is not a good idea...keep in mind that is is not dough but rocket fuel, if you ignite it while handling it - you get incinerated

@@AKAtheA bowl scrapers are typically a kidney shape piece of hard plastic. no metals involved

@@zakhenry depends, the ones used to get smaller amounts of softer dough out of the bowl are usually pastic, but the ones much more frequently used including to scrape dried dough from the sides are actually stainless steel

I was specifically thinking of the Ateco plastic bowl scraper! Mostly since they’re already wearing gloves. Just seemed easier.

Ggg

that day was not your time...

That sounds like a pipe bomb

jesus christ dude

Your friend needed to have his PhD revoked for that one. That's like an electrical engineer sticking a fork in an outlet to see what happens. ...never mind. I just described ElectroBoom's entire channel.

@@talyrath I don't think his friend had a PHD at the time, says he has it now, not then. At that time, he likely was only in his first or second year of college.

The mixture is way too viscous for that to make a difference. The less electrical devices you have near propellant, the better. Edit: With a mechanical device going back and forth extremely rapidly, there's a distinct possibility to: 1. Build up static charges that could discharge into the propellant 2. Cause small sparks from metal-to-metal contact within the device. I'm not saying that would happen. I'm not even saying it's likely to happen. But when the consequences are that you die or at the very least your face burns off and you're horribly disfigured, do you want to take those chances? No.

@@wgoulding I disagree, the right vibration can liquify extremely viscous and aggregate heavy concrete when pouring into molds.

@@wesselscreations concrete is different because you have a whole bunch of solid particles (aggregate) suspended within the liquid cement. When you vibrate that you achieve something called liquefaction. With solid rocket motor propellant, it's much more of a gooey plastic mixture that responds elastically to vibration. Vibration will help, but the problems they have cannot be solved just with vibration. I can't say more because otherwise I'd possibly be breaking federal law.

@@wesselscreations testing your theory on both substances would be a great experiment.

"keep the fuel off the vacuum lid" Use smaller batches. If that is not an option, pull vacuum as much as possible, then quickly vent, which will collapse the upper bubbles. Repeat until you can pull a full vacuum. Regarding the vacuum filling: Take a look at vacuum infusion for glass / carbon fibre with epoxy. Using the same bagging (simple plastic bag, but really strong) and sealing should not just be cheap, easy and fast, but also allows you to manually push the stuff in the tube to help the vacuum.

This is correct. You have to do a bunch of paperwork to do it. And have licenses and such from the ATF (which is actually now the AFT&E, the E being explosives. Yes, solid propellant is classified as an explosive).

Even a LEUP doesn't mean you can transport across state lines.

Are you still persuing rocketry or related stuff in India? (Fellow indian here)

@@theweblover007Well as lucky as I was getting that internship, my field of interest was in biochemistry and biotechnology so I'm pursuing further studies in those fields.

weigh the container and material inside, then subtract the container and leftover material after pouring

We did not but that is a phenomenal idea, thank you!

A good technique for weighing liquids is to pre-wet your container with the ingredient, drain it, tare it, and then add the amount you require. When you have added the ingredient to your mix, re-weigh the wet container to check that you have added the right amount.

I made some composite motors using PBAN back around 2001 and I recall the mix being much more a pain to work with then HTPB was.

They used PBAN for several reasons. The space shuttle was designed in the seventies, and PBAN propellants were standard during that timeframe. Price and availability was another factor. Polyurethanes can be tailored to all kinds of curing reaction speeds, but considering the sheer size of the cast segments it was much safer to use other cure mechanisms, since traces of moisture creates gas bubbles in polyurethanes and exothermic cure reactions might cause problems during casting such big grains. And the main reason PBAN was chosen wa sits mechanical properties. There is a lot of stress on the propellant grains due to the sheer size, especially once it burns. The PBAN propellant was more durable in that regard.

Yeah, other solid rocket motor facilities have walls that you can run though like the kool-aid man; so you don't have to get to an exit that might be blocked or crowded, you just have to run away.

As a worker in a small high school in the middle of the french countryside, watching this video wasn't particularly difficult for me ;)

what you don't know can't hurt you... right? No?? 💥

@@dfgaJK right

The moment he started talking about getting in a hurry, I started writing the root cause report in my head.

As kind of a collegue of yours from abroad you are absolutely right. To add the one thing tha bothered me most: Extracting the casting tools was really hard to watch. There is an IMMENSE mechanical stress on the propellant in terms of friction, and that could have easily gone off directly next to your face. These kinds of operations MUST be done remote-controlled, especially at the size we're talking about here. There has been more then one deadly accident in the industry at this very step...

Ammonium perchlorate is a bit impact sensitive, if I remember correctly. I use potassium nitrate. Not as potent, but it works. Richard Nekka Epoxy

That approach with APC will lead to a large hole in the ground.

Bad idea. If you atomize AP or metals in the air it's an explosion hazard. You always mix liquids (minus binder) first then particulates, wetting out each as you go. It's a risk mitigation thing.

@@SparkRocketLab "risk mitigation" is such a bland word for avoiding blowing up the entire building you're in.

@@SparkRocketLab If you go slow enough ( or had a paddle so you could avoid dry first with some liquids ) you end up with a putty like mixture and I did mention the potential of it igniting on it's own. I admit I don't make my own rocket engines or mix such chemicals, I am a baker. With a Dough Hook, you get the dry to incorporate smoothly with the reverse of how you mix with a paddle. All precautions should be taken as the ingredients can potentially use the Aluminum Dough Hook as yet another fuel for ignition.

Always remember the way things go! For cars, it's shiny side up, rubber side down.

Do you know what type of of pen he uses?

Hello Space Potato.

Did we find a Mass Effect relay there? (Edited for autocorrect)

@@silmarian I'm not permitted to say more in case I alter the timelines, but keep an eye on Pluto.

I'm a potato salad. May we be friends

@@potatosalad68 in the future all potatoes put aside their differences and join together in camaraderie and starchy living

Those are called 'catch pots' or 'resin traps'. Very useful indeed! However i'm a bit unsure if they'd even want to mess with it in this specific situation, because it being used means APCP all over the inside of the lid and in the tubing. Better than inside the vacuum pump, for certain, but still a pain in the rear.

What kind of accident?

@@robertobryk4989 Ignition. APCP can ignite just from being hit hard enough. If you accidentally hit a piece, or if there's a bit that is on the ground and gets crushed when they're dropping the whole grain, it could flare up and propagate to the rest of the motor. Suddenly your rocket is on fire, and as he explained earlier in the video putting it out is not an option. You run and hope that it just burns itself out without too much damage to everything around it.

more to the point.. if it's possible it might blow you, it's worth filming :D seriously though glad nothing happened but always concerns me when they admit they dont have the right tools and they go anyway....

It is STEM not Steam, Art has no part in this equation. Because the weirdos have taken it too far.

@@davidkohler7454 Art, is the creative aspect of engineering. I see it, therefore I can make it. Imagination has been a crucial part in engineering breakthroughs. So I think Art in S.T.E.M. has its place. Once I though about how I had to visualize the construction in my mind to create the result I wanted. It made sense. How do you make an engineering drawing? or a blue print?