fire death machine - i made a rocket

i have always wanted to build a rocket so last month when me and the science boys took a tour of spacex i hatched a plan while they were busy taking photos i was stealing company secrets and i have discovered something huge i've also discovered this bolt on the launch pad i hope it's not important anyway i wasn't allowed to take pictures inside the facility what about if we analyze some videos on youtube maybe then i can learn how to make a rocket uh yikes are you serious oh i've decided not to make a rocket but what about a rocket engine i found this video of some russian guy that made a rocket-powered sandblaster and it's honestly the best amateur rocket engine i have ever seen on youtube so i did what americans have to do i've continued the tradition of stealing secrets from the russians watching the video i have an idea of how this is assembled and it looks like three tubes nested together air enters the outer tube and is distributed into the center tube which is the combustion chamber fuel's injected at one end of the combustion chamber and the nozzle is at the other end this actually looks pretty easy to make so i cut up some tubes that fit inside of each other made some spacers for the tubes with my lathe drilled some holes in the combustion chamber and then welded everything together now the nozzle pretty important part it turns the high pressure gas in the combustion chamber into high speed gas as it expands down the exhaust nasa has a ton of information devoted to finding the perfect optimal rocket nozzle geometries but i'm no rocket scientist so i just kind of eyeballed it and i made three different sized rocket nozzles and i'm just gonna see which one works the best all right let's get serious because we are about to test out the rocket propane is coming in here to the back of the rocket compressed air this is what we're going to be using to ignite it it's got two taser modules on it you just slide it over the spark plug like this press the button on the back makes a little spark so hopefully this will be able to ignite our rocket here we go so first i'm going to give it some air then i'm going to increase the propane until it ignites and then i'll figure it out from there maybe some more air oh that was crazy did you see that i accidentally turned it off but you got to see the trees over there all the bushes are just going crazy when i first turned it on it was like pushing itself backwards a little bit i really didn't think it was gonna have that much thrust okay we gotta try that again so the patterns that you can see in the exhaust are called shock diamonds and they appear when the exhaust gas is traveling at a supersonic speed the patterns are formed when the exhaust pressure is lower than the surrounding atmospheric pressure so the air pressure squeezes the exhaust and that's what causes those bright spots okay so this works amazing but you hear the compressor running this thing uses so much air it drains the tank in like 20 seconds the rocket just uses way more air than my little compressor can keep up with so if i'm going to get a bigger air compressor i might as well just make a bigger rocket too so i was looking at these diesel-powered air compressors but the problem is they cost eight hundred dollars to rent for a week so this video is sponsored by morning brew it is a newsletter a free newsletter just type in your email and you get the daily news sent to your inbox every day like most of you before i subscribed to morning brew i wake up i get on my phone and i kind of bounce around the internet for a few hours but with morning brew i still lay in bed on my phone but i get all of my business tech and finance news all in five minutes tv news sucks we all know this it's boring it takes them an hour to get through the day's stories the only thing it's good for is keeping my dogs entertained while i'm gone and now he posts conspiracies on twitter morningbrew is concise it's witty and it's informative i just learned that you should probably never trust a celebrity pumping a cryptocurrency or an nft and i learned that dogs can understand the difference between natural language and gibberish now there is no reason not to subscribe to morningbrew i already said it's free and it takes 50 seconds you already could have done it by now if you're interested in business tech finance it takes 15 seconds to sign up i'm serious go to morningbrew.com backyard to sign up use my link type in your email hit submit you're done let's get back to the video the new rocket is twice the size of the first one so that means that it needs more fuel and i've got this little hydraulic pump that can pump up to one liter per minute at 700 psi so i've got the rocket i've got the fuel now i'm going to get the air compressor and she is how you say muy bonito 49 horsepower dual air outlets 185 cubic feet per minute inside she is powered by two rotating screws okay i got a little carried away but all you need to know is that it puts out a lot of air so much air that when you touch it it feels like you're almost touching a force field or a stream of water instead of a bunch of air anyway it's probably time to stop messing around with this and start testing out our rocket that was a bad idea so it's about to get dark outside perfect time to test out the rocket so we're gonna hook it up to some propane and test it out and see what kind of power this thing can put out [Music] dude we just made a rocket steven that was so cool it worked so well it worked good what do we want to test it on let's try some things all right what if we try to stake because i'm curious what if you touch the rocket exhaust what would happen to your fingers so we're going to try a steak oh man all right let's try this out steven started out by just trying to sear the outside of the steak but then he brought the steak directly into the exhaust stream i thought that the hot exhaust exiting at about 5000 feet per second would act like a lightsaber but it didn't burn the meat so much as it just completely shredded it you can see the exhaust is kind of unstable and that's because we were using so much propane that the tank started getting cold and losing pressure i kind of thought this might happen so we're going to use the hydraulic pump instead wow look at that meat it is just it cut it in half stephen it totally cut the meat in half it's just roasted it definitely don't stick your finger in there now we're going to find out what happens if you put your wiener in a rocket let's try it starting the liquid-fueled rocket is a little bit more difficult i spray some starting fluid in it to get started first and then i slowly increase the air until i get ignition then i turn on the main fuel pump and i adjust it till i get a nice stable output i have to slowly put the hot dog in the exhauster would just instantly cut the hotdog in half and i feel like this really shows how powerful the rocket exhaust is i mean the hotdog and the rocket exhaust are acting like opposing magnets just trying to push it into the exhaust wouldn't work at all so i had to grab it on either side and slowly bring it into the flame i've got to say these shock diamonds look so cool and i was super excited to see them just persisting like that switching to kerosene really made a difference in how bright the exhaust was too the propane was just a little bit too pale but one downside of kerosene is that it makes a lot of smoke when you run it too rich not that it really matters when you're making this much smoke drilling a hole through a piece of wood that was the best one yet that worked so well now we're going to be trying a coconut i'm going to wear gloves this time because uh looking back at that footage that was very scary it's easier to start the rocket when it's still hot because when the kerosene touches the hot metal on the inside it vaporizes and the spark plug can ignite it better you see all the stuff coming out of the coconut that means that we drilled through it and that white stuff isn't just the coconut water it is the entire inside of the coconut blasted out just like that and then we flipped the coconut over to drill through the other side and i'm pretty sure we just made the world's first coconut-based afterburner oh my gosh it is it's completely hollow on the inside i thought we were just gonna like drill through it or something and we would see some like coconut meat left on the inside but it's all gone it's just the wood of the coconut that's wild i gotta tell you guys how hard it is to hold something up against that rocket exhaust it's like what would you say that is i mean i mean it feels like pushing against a 200 pound person pushing against you you really have to fight it it's impressive this rocket engine was so cool we scavenged for more things to test and you know we had to try a watermelon it held up pretty well at first but once the flame made it through the exterior it was all over take notes mark rover this is how you make a watermelon smoothie we also tried a cabbage and it exploded exactly like i expected it to the exhaust drilled through the leaves ablating them from the cabbage next we tried an apple which split right in half and then a can of sparkling water which honestly put up more of a fight than i was expecting it couldn't hold on for long though the heat caused a pressure increase which pops the top and then the flame made it through the can and blasted out all of the water [Music] the rocket engine was working really good so we decided to try some more things we tried the second stake and the results were way more impressive than when we used propane as the fuel [Music] you can see it just shredding the meat and bits of it we're flying through the air in fact it might even be a little bit too powerful i am covered in meat this is terrible i wanted to see if i could use this to cut through some aluminum but the rocket had other plans it was really hard to keep it steady but once i got a hold of it the flame cut through it just like a plasma cutter i could even punch a hole straight through the center i was kind of worried about hypersonic molten aluminum particles being flung out by the rocket exhaust but everything turned out okay [Music] speaking of shrapnel we also wanted to try a can of shaving cream and this was pretty scary i imagined the can just exploding from the pressure buildup so we focused the exhaust on the top of the can which is where the seam is [Music] and finally we tested a whole coconut and the sparks and embers that came off this thing were crazy i really wish we could have done some slow motion but it was just too dark outside and if we used lights you wouldn't be able to see the exhaust anyway this has got to be the fastest way to remove the husk from a coconut in addition to developing a backyard space program i've also been developing some new t-shirt designs four new t-shirt designs are now available on my website and to everybody that has been sending me daily memes for the past month please stop i give up you win the free t-shirt i can't take it anymore my inbox has been completely destroyed for the past month to everybody else you can go to shop.backyardscientist to check out the merch and i will see you guys [Music] you

Channel: TheBackyardScientist

Views: 3,230,998

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Id: Q1AJ3QGvrb4

Length: 10min 38sec (638 seconds)

Published: Thu Jan 27 2022