SCREAMING Shotgun Slug - Rocket Nozzle Experiment
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- Опубликовано: 13 сен 2024
- Saar sent us some de Laval nozzle pro-jo's to test out in this video. What will happen if just the nozzle is driven through the air? Knowing from past tests about how the bow shockwave prevents airflow through something like this - I knew they had to be launched at much slower speeds. We learn a lot about subsonic and transonic speeds and their effects in this test.
Saar's Spice Candies! (he didn't sponsor us, just sent us the nozzles) He makes great-tasting candy.
www.spicecandi...
Patreon: / taofledermaus
![MISSING: SLIM SHADY [Expanded Mourner’s Edition Trailer]](http://i.ytimg.com/vi/xh8qgHrOO1g/mqdefault.jpg)
The electromagnetic vacuum trebuchet makes a good sound
Almost like a loading shotgun.
la haya almost.....
la haya hey man you can’t say that word here, this is a SAFE SPACE
It legit sounds scary to me in slomo.
Maybe the paper affects the air flow to "start" in the projectile at higher velocities
**removes all imagery of fire arms**
**gets flagged for use of the word canon**
Yes! 😡 Lol
More like gets flagged for uploading period
i have a cannon camera
@@Andy47357 I have notified the entire U.S. military
It was the video violence against milk jugs that did it.
I doubt you're using anything fancy to accelerate the slug. I maintain the notion that Danny is throwing it
Absolutely, with his new bionic shoulder
Leif Vejby Danny is the six million dollar man
He's electronically trebucheting it with the power of vacuum apparently (4:04)
I thought he was spitting them out like sunflower seeds
@@leifvejby8023 Venom Snake
Thank you for accelerating interesting projectiles into visually appealing impact areas. Great job guys.
Insane how strong Danny's lungs are to get a blowgun to fire something that fast
Demonetized in Canada
@@felixar90 Eh?
@@Corvus__ Blowguns are illegal in Canada. (classified as a prohibited weapon)
@@felixar90 I was trying to make a Canada joke.
@@Corvus__ Eh?
Just call your accelerators "accelerators". Newspeak makes it doubleplusgood.
A nice allusion to 1984
RUclips: "The intro text says "gun", therefore we demonetized everything to perpetuity!"
"Vacuum Gun" was said at 2:53, we are scared of his, demonetized.
Truthfully, the hoplophobes that run RUclips never got past the intro text.
@Zach cash Patreon support mostly.
They really just need to make a video where they show an invention that launches these projectiles and just mute out the sound of the gun shot. Like make some thing like a giant potato cannon wrapped with wires and circuit boards, a burst disc at the front of a vacuumed barrel and then say this is our launcher. It's OK if everyone on the channel can tell if it is fake as long as it tricks the censor person. Also go full out on the pretending it is a rail-gun type thing with no "rail GUN" giggle giggle slip ups. then they just need to either blank out the sound of the gun or even better replace the sound of the gun shooting with some cheesy sound effect like someone flicking a thin piece of spring steel with some charging capacitors overlayed on it. if you use a few sound effects at once to create a cool sound they might believe it but I would at least start by muting out the sound during the gunshot. The more you obscure it the better. bring a piece of pvc pipe with you and strap it to the end of the shooting table or shoot the slug through a much bigger wide open one and make it even more believable that it's a giant potato-rail-vacuum launcher, not gun. actually eliminate all uses of the word gun from he videos. I kjnow it's stupid but I'd rather this than no videos!
The need to DEMONetize they're self lol
Dammit Jeff, you were doing so well until you said vacuum gun
Its an elongated vacuum accelerator torus for education and scientific research.
Reckless Roges no sir that is actually a weapon of mass destruction and can kill easily, you don’t want it to inspire the next shooter
@@waywardhero1177 I live in a country where guns are nightmarishly hard to get, and let me tell you; drive by shootings happen at least 4 times a day, maybe 7 if it's really bad, the police conduct multiple drug raids on the daily, getting plenty of people killed. If you're not gonna get shot, you're gonna get stabbed by some addicts. I would love to have access to a gun to defend myself with, and hope to god that the law is smart enough to recognize self defense is a thing to consider.
And what makes you think having a gun law prevents criminals to commit murder? What, you expect them to surrender their guns just like that? The job with the highest fataliest per year is the driving industry, and that's just the accidents. Consciously? Grab a car, go to a marathon, and wammo, you've got triple digits in the kill count. Look at Hong Kong, they don't have guns, but they sure do have Molotov cocktails. Thermite is just some rusted iron, about of shaved aluminum, and a strip of magnesium to ignite it.
And one last thing, knives kill 6 times more than guns in America alone. 6 times. Guns aren't the problem, people are, and the only solution is proper education and mental care.
Vacuum *GUN* !?!?!? Did you say *GUN* !? DEMONIZED!!! 😤
Alternatives to the G word: cannon (don't ask why it works.), launcher, catapult, linear motor, trebuchet, mangonel, linear accelerator.
@@martindinner3621linear motor is the best
I prefer Tube of Joy
@@jnbaker7422 That is a good one! ROTF LMFAO
@@jnbaker7422 I thought those were called Pork Pistols? :D
That is BY FAR the most accurate potato accelerator in the universe!
Thanks guys, that was swell!
🤓
Danny is just as good with the slingshot used in this video as the other items used in the past! ;-)
The slingshot channel has had demonitization from youtube.
That sounds awesome! can you reuse those? I would LOVE more of these maybe at a longer range or even a down range cam/mic?
You might want to change the sound of your... uhm.... Trebuchet for the next video. Great job.
Dub in some cat meows. It'd be totally legit.
The trebuchet sound will be recogniced if not altered massivly. They hate trebuchet sounds.
Crimson Halo I’m in for the cat meows idea. RUclips *loves* cats man
Medieval siege tools do make quite the noise. Maybe you could borrow/compare with ruclips.net/video/M1iPxY3FYNE/видео.html ?
The whistling sound kinda reminds me when the projectiles are launched in those Clint Eastwood westerns...
I've had rocks make that peeew sound ricocheting off stuff with a slingshot as a kid
First thing I thought of was Clint 😁
I can't wait for ya'll's patreon to take off sufficiently well that you can pretty much give youtube the finger and call a spade a spade again.
There's unfortunately also the risk of a strike because youtube and reasons. I'll rather have the cloak-and-dagger crap than no Taofledermaus.
@@andersbendsen5931 Hasn't gotten other channels booted. AvE's been openly mocking it for years. Pretty sure Forgotten Weapons is subsisting primarily off Patreon as well.
@@TestECull AvE?
@@Chris-qg2fg Yes, AvE, Patron Saint of Shop Bumblefuckery. Tool teardowns and general dicking around of the sort. Well worth a watch, if nothing else you'll get a chuckle from the lingo.
@@TestECull Good ol' Uncle Bumblefuck. What a guy!
I love how you are doing all the 'things' to keep your videos monetized... you guys are very educational
It's pretty clear that even at subsonic speeds the flow of air through the throat of the DLV nozzle is choking for several reasons -- one of the biggest would likely be the creation of a ring vortex due to the sharp transition from convergent cone to straight section. In my work with pulsejets I found that a sharp edge promotes a ring vortex that effectively reduces the throat area of a tube by a huge amount. What's needed here is a smooth (curved) transition so as to avoid the flow separation that promotes the forming of a ring vortex. This is also why you'll notice that jet engines have a bell-mouth intake rather than just a sharp edge at the front. Without the smooth curved intake, the ring-vortex would severely choke the flow of air oing into the engine.
Or high performance pistons, even. Air is some tricky stuff.
Amazing how Danny is so accurate with his Steam-powered electromagnetic vacuum catapult!
Love the sound of your new "vacume" gun. LOL
nooooooo... dont say the G word, YT does not like that
Its an air cannon
Its an elongated vacuum accelerator torus for education and scientific research.
Really enjoyed your tests using the new accelerator system. Many of scientific tests being done by this channel have never been seen at high speed or been attempted at all. Each new video provides a wealth of information about high velocity aerodynamics and many other topics. Thank you for doing what you do and adapting to the ever changing ecosystem of RUclips.
Excellent steam flux capacitor projectile delivery system. It sounded like the original hand ejected model. Those were the best. 😁👍🤣👍👍
no not projectile delivery system.
package delivery system. the keylar mitt has received and captured the package.
@@nerys71 oh yes, package delivery system how could I make such a mistake.
😃😄
Time to hire Joerg Sprave to build a new YT-approved launcher :-)
I could have sworn I'd seen a video collaboration with then already. I hope I'm right
Let me show you its features?
It gonna launch tubas from a 30 capacity clip.. and they play as they fly.....
2:50 did i hear the g word? Demonetized!
My first thought. He also says a c word later which is probably on zee list too.
@@nexviper oddly, they don't seem to have a problem with cannons. (Probably because the only ones they are exposed to on a regular basis are black powder antiques from before the American civil war.)
The Romans used to throw Lead balls with a hole through them from their catapults, these whistled through the Air causing panic in their enemy. I think you just proved the same thing with your subsonic shots. Amazing stuff again guys, thanks.
Were you imparting rotation to the projectiles as they passed through the linear accelerator?
gusbailey68 i believe they varied the voltage to get the needed spin without a sabot
Yes, we had the angular momentum oscillator turned on
@@taofledermaus "angular momentum oscillator turned on" Hahaha, brilliant!
@@taofledermaus I see what ya did there😁
Is it weird for a high school drop out to understand what you guy's are talking about without googling
Oh yeah! Looking at the 411 (4:11) Charging up the trebuchet, or previously mentioned, Steam Resevoir, Flux Capacitor... You guys take me back to the future.
Did your trebumathingy apply revulatations to the nozulator device?
NO3- sounds like AvE talk lol
Very well executed use of a non-demonitizing mass acceleration system.
No ad played, despite a yellow indicator for one at the end. checked 3x
Add played for me! just fyi :/
I got a couple of ads at the end
I didn't have a single indicator, got two ads
You should try putting one in your particle accelerator next video.
That is a LOT of particles to accelerate
@@DougSalad bah, that's nothing for the vacuum powered flux capacitor steam trebuchet particle accelerator.
I own an electron cannon. It's part of a cathode-ray tube.
That screaming valve sounded like a STARWARS tie fighter / xwing. How can I get some? Would like to see it put up against a proper ballistic gel block or aquarium slowmo shoot.
Nice work Taofledermaus Crew! As to your comment at the end of the video, I have learned something. Your experiments really helped me to better understand and visualize the issues the U.S. Aircraft Manufacturers and Air Force Pilots were having with compressibility. As you know, it caused an aircraft's control surfaces to be useless when the aircraft was flown in the transonic range and caused the death of many pilots. Once they figured out that swept wings were the answer the next issue was; how to get the air into the jet engines at high transonic and supersonic speeds, and once it was in the engine, how to slow down that airflow to a subsonic speed in the engine so that shock waves don't form inside the engine and tear it into pieces. Your experiment in this video really helped me to visualize what exactly is happening when an object approaches the speed of sound, thank you!
thanks John!
Be careful not to blow out a Gauss coil on your launcher. It can be tricky to repair such advanced technology.
Yep, they have a nasty habit of shorting across the flow control diode. (Check out the Hacksmith, they really do.)
Them super caps ain't cheap
Unless yt? Has a Dr-Gauss😄
Kinda fedup with YT policies, 10/10 would follow on some other platform.
Can think how good sound editing could make for hilarious vids though
It is a very accurate slug sub or trans-sonic. I guess it is kind of an inside out diablo shape. The whistle was neat. You might need to fire one at longer range to hear more of the whistle.
It prefers to be called gender neutral-sonic..
I think you mean to say accelerate one at longer range.
I like how y’all are trying to test RUclips and not get demonetized 😂 love yalls videos!!
Now imagine a true ramjet version of that thing :D Even with 1second of fuel, it would make the um… little Tony a long range Tony. I just need to figure out how to make the fuel system, mixer and ignition ram air driven and simple to manufacture.
And fit it in a 12ga diameter, and make it able to withstand a couple hundred g on launch
@@Hirosjimma My thought is to make it from 2 main parts. A outer cylinder with a sealing lip and the inner part from rather thin titanium. The cavity between both will be the fuel tank. And a smaller mass that seals the fuel injector and rushes down the tank when accelerated to displace a priming amount of fuel into the mixer/burn chamber. For ignition, I plan to use the flex of the upper portion of the inner part. It will set the heavier than fuel component free and mix it thanks to the high acceleration on launch. The mix will ignite on air contact.
So I don't think there will be problems with the acceleration or size. The geometry works in our favour against the main forces. I just need to figure out where to put the air ports to have neutral pressure when equalising the tanks pressure for the fuel that is used up.
I guess I'll make a parametric 3d model to be able to change these positions easy and make some models filled with water. Then see how they behave in a strong air blast. Sadly I have no high speed camera. But then this is supposed to be a fun exercise.
Oh well I guess I'll have to provide doodles for any of this to make sense. For now it's bed time.
Mercury when compressed enough combusts
@@TheFoxfirelight Interesting, I didn't know that. Thought it would limit the materials of the slug, since mercury attacks a lot of the lighter metals. Do you have any data on how much energy is released when mercury burns?
@The Weapon Collection Thanks, no need to look it up. I just never heard of pure mercury burning in air. Besides that compound might just make the whole thing blow up from the initial shock. And since it carries it's own oxygen, it would be more of a rocket than a ramjet.
You guys throw those Screaming Rockets really fast! I even here a boom from how fast!
Next step: Put this ring thing around a central tube, that resides in a larger, outer tube. The central tube has a few tiny holes to vent some of the 'steam' into a cavity behind the flying ring. The middle tube propels an 'aerodynamic cone' to create a low-pressure zone in the path of the ring. Pressure transferred from the inner tube to the outer tube propels the flying ring into the void that is cleared by the faster cone.
Anticipated result: *SCIENCE*
I'd like to see that tested!
Science where we are taught that light travels in straight lines?
@@birddog9708 What?
Buck Starchaser Watt ?
@@birddog9708
Light does usually travel in a straight line. Exceptions:
1) Change the refractive index, like when you shine a laser into the water at an angle.
2) Light can be redirected in-flight by massive gravitational pull.
3) Light can be made to appear to curve on it's own in-flight by messing with the phasing of the wave, but it requires extreme precision.
I'd be interested in seeing how this proje- err, accelerator, handles the transition from supersonic to subsonic. Most accelerators start to tumble at that point, but I think the transition from elliptical shockwave to toroidal airflow might keep it stable, like a ballute.
I don't expect you guys to be able to test something like this. It's just a thought I had, and I'm too lazy to learn fluid dynamics so that I could find out.
Doing this will make it very difficult to get supersonic exit flow. Even if you do obtain choked flow at the throat, you’d need substantial back pressure that would be many times that of atmospheric to push a shock out of the nozzle exit and get supersonic exit flow.
Having been a drummer, back when we had backline amplification, I've a bad case of tinnitus, and didn't hear the shriek, until you went slomo. I'm old! 🙀
"Chances are you haven't either!" 🤣🤣🤣
Ok ok! I see you!!😎😅🤣
Man I love it when you break the physics down like that. It was also hilarious to see that vest go skipping along the Lane, it looked like it was a circle it got rocked so hard
I need more BOXES! ...lol
On nice! First time in forever I got an ad on your channel.
It was actually a product I like so I clicked it too.
just fyi, even above mach 1, there is airflow behind the shock. I would assume that the enormous gs of the object slowing was enough to keep the plug in the back of the projectile.
Besides bow shockwave, There's also internal static pressure bubble (like with early venturi designs) when there's too much restriction in the flow (not enough outflow area for the inlet ratio) I came across that at well below mach speeds-building cf ram air ducts. For it to get resonance on these catapult pieces lol the designer got out of that issue. Good job reducing the velocity that can be tricky with sling shots
What voltage levels were you using in the flux capacitor? And could you convert the voltage level to something measured in...I dunno, grains?
Andrew Marchetta 1.21 Giga Watts
For trans-sonic, it means that air may be moving at a supersonic rate to flow around the geometry of a projectile/wing, even if the geometry as a whole isn't supersonic. For most of your shots, I'd be willing to bet that you've got a tiny bow wave right at the projectile's leading edge that dissipates once you get about 1-3cm away from the projectile. I'd love to see SmarterEveryDay's Schlieren imagery setup with that projectile.
Good idea, Very ad friendly. I would let my family watch this. I also got an ad for a product id use.
Okay so maybe somebody has already pointed out this idea but here goes anyways. I would love for you guys to get some distance between you and the target, maybe 200 yards or something similar and set up a camera with audio in the vicinity of the target. Imagine hearing the projectile going from a sonic crack - going transonic making much less noise - then finally screaming very loud right before it hits the target. I think it could be a very interesting science experiment.
I think the barrel pressure is seating the paper maché firmly in the ass end of that projectile, thus not allowing it to separate.
That's what I was thinking too.
No because as soon as they got it to the right speed it worked.
@@david2ljdavid2lj56 yeah, I should've watched the whole thing before typing oops
Barrel? What barrel? These were launched from within a linear cycling electro magnetic, steam damped, flux field! We don't need no steenkeen barrel!
I love the light reflecting off of the "water" droplets at 3:19
So, they got you to use "steam" power did they.
Anyway, absolutely awesome nozzles.
Listen for sound after the launch at about 9:20
Nice work with the flux capacitor, vacuum pump and trebuchet!
Danny can really operate that atlatl!
If that nozzle was made to the correct proportions, then the shriek was the sonic boom of the accelerated airflow leaving it. Fascinating!
I'm suprised this hasn't been taken down yet
That is one hell of a slingshot. Crazy strong elastic used. Really makes a crack when you let it go!
I heard using better flux capacitors will make it fly around corners
Fired from the super high power m29 plutonium space discombobulater.
12:11 Sounds like a star wars laser gun.
At 2:00, there is a mention that if a bow shock appears, then no airflow at all will enter the nozzle.
That's not the case. Think about it - any supersonic object will create a bow shock. So if a supersonic fighter jet is going to produce a bow shock, then if there was no air reaching inside the shock, that would mean the engines would be starved for air. And that's not what happens at all, of course.
In fact, the bow shock is where the supersonic flow almost-instantly drops to subsonic - meaning that you will always have subsonic air entering the nozzle, regardless of the free-stream velocity.
Make weekly videos how you remelt the Lead Plate people wanna see them and they can't get demonitized
This is a good idea. May not get as many views as a normal video but I cant see how it could be demonitized. If it was they clearly have it out for him.
lead is toxic. heat can cause injury. the furnace releases C02.
The Hickok 45 impression at 10:19 was spot on 😂
@5:59 - some say that vest is still spinning along the ground to this very day.
I had commercials! Yay! I’m happy to watch them to help your channel keep going. This is the only time I have ever been happy to see a commercial. Lol. Keep up the idea of sending projectiles down range at a high rate of speed so we can see the results.
I really miss Danny from the video, all the preparation and little comments before "launching" / "initiating the ballistics experiment" - becomes very documentary like... Still an amazing result! I was watching and ideas were popping out in my mind: subsoning whistling projectile, accurate and re-usable? You must be kidding us!! I want to make one for my pcp airgun: Lead hollow tube, cut to length (custom trials ahead), formed openings with a sizer pliers!!! And for shotguns, iner and outer copper tubes (plumber's sizers), with lead custom weight between the two tubes.... Both ideas look easy to mass manufacture... I think the candy maker can make a fortune out of this. I would like to see a follow up with lead and copper, smaller diameters and various lenghts. I also believe that of the income funnel had sharper or rounder "lips" it would behave differently at the higher velocities. Any way, too many thoughts good job guys, thank you!!
No ad during, but I got one to watch before it started. Very cheeky ad for for a tapping machine, pretty amusing.
I want to hear this one shot into the distance
Also, send some over to the slingshot channel so J. can have some fun with them as well :D
You guys never cease to amaze me or entertain me thank you so much Jeff Danny and OG even when you aren't there
The inside of the nozzle looks like a negative of a diablo round
I think that vest was trying to tell you it's had enough! Good job guys. Another one for the books!
This video explains my internal suffering.
the energy of the headwind air flow is finding the path of least resistance. the inner cone shape of the projectiles are pushing the inbound air to go back out of the front at transsonic and supersonic speeds
What kind of witchery are y'all using to launch these things? It's amazing!!!
*WINK*
I know right! someone should produce them and maybe they can be used for self defence.
I think they used something like this but smaller, - start at 4:28 ruclips.net/video/JT0wx27J9xs/видео.html
He's using a powder combustion powered matter accelerator.
Hi Jeff. One of the things I do is design rocket engines, so here we go. The relationship you are trying to replicate is the A1 vs At vs Ae relationship where A1 (subscript 1) is the cross sectional area of the combustion chamber, At is the area of the throat and Ae is the area of the exit. In this case, the order is in reverse as the intent is to have the atmosphere in front of the object be the combustion chamber. There is an important relationship with the convergent/divergent nozzle between the regions of the exit, throat and the chamber and the respective velocities at these regions. The region defined by Ae is supersonic, At must be sonic (or else you will get choked flow) and A1 must be subsonic. One of the aspects that is causing your issues is that the combustion chamber must not be merely subsonic in general, it must be several times below the sonic velocity at the throat. Typical combustion chamber velocities (V1) are around 250-350fps, the lower the better; for combustion and for flow. As V1 -> Vt, you rapidly approach choked flow.
Another aspect that is not helping is the sharp transition into and out of the throat. As V1 -> Vt, you will get air flow deflection off the divergent nozzle out into the center of the throat (the air has momentum). With a generous radius, this will smooth the airflow causing it to become semi-laminar to the convergent section and get it into the throat. With the sharp transition, you are likely getting flow reversion effectively blinding the throat to any flow. Lastly, the convergent/divergent nozzle relies on one thing to make it work, pressure gradient. It converts potential energy into kinetic energy by allowing an ever expanding high pressure fluid to exhaust to atmosphere. The inlet to your "combustion chamber" end has no means of compressing the working fluid (air) so you get very little pressure gradient. The simple action of the object moving through the air actually doesn't cause the same type of effect one might think. Remember, everything follows the path of least resistance and the easiest way for the air to get from the front to the back of a moving object, is usually to just go around it.
The way you get this to work is how scramjets work. You use the frontal edge of an oblique shockwave to cause a high pressure region around an specific cross sectional area thus compressing the working fluid within that compression region and forcing it through the system. You could replicate a ramjet where the leading edge of the outside diameter of the object forms the shock and then an internal cone acts as the reflection surface. This though would require you to have some type of support structures (pins, fins, etc) that holds the internal cone in place but at these small sizes, anything of significant thickness to provide support, would also cause severe losses since its frontal area will be close to the area of the system itself.
You can get higher flow rates through your nozzle but as I mentioned earlier with the V1 vs Vt relationship of velocities. For your flow to rise, your speed must slow down.
First thing I would do is find a lathe and break those internal edges into and out of the throat, by a LOT.
I can do some calculations and offer some specific sizes and dimensions that also might work out better.
2:49 DON'T say the "G@N" word! TubeYoub's speech to text AI will automagically red flag your video.
Gum!
Hope it's better then their auto subtitles .... Put em on and watch the first 10 seconds.
Rusty Shakalford We need to hope that it’s worse.
No matter what you put out, your laying down some serious quality content!
And not a bad ad song while i wrote this.
You should consider downloading a more "up to date" sound effects pack for your electric hadron accelerator system, as that "pow!" Sound effect is quite out dated...
I think the edge of that nozzle is so small that it creates that supersonic wake more faster in certain speeds than other ones with more bigger and flatter noses. With a smaller tip pressure increases, thats what I learned from Hydraulic Press Channel videos. I can see it working similarly in bullets that have certain mass and velocity.
if civilization collapses reusable projectiles will be real useful
hot damn i can comment again.
i protested the persecution of shooting channels and couldn't post comments for a week and a half ish.
Seriously? RUclips wants to destroy the First and Second Amendment.
@@floo1465 it could have been a coincidence , if you believe in those.
nonimport ante No, I do believe in coincidences. Just, they definitely want to destroy the Second Amendment and possibly the First. Also, I was not aware that some people don’t believe in coincidences.
Sup everybody I'm a big fan of the work y'all do...one thing about this vid I need to say...your projectile may be subsonic but the air flowing over it goes supersonic ...just keep that in mind
That was the coolest yet! Those rounds need further testing though. The potential has yet to be discovered
TAOFLEDERMAUS: Breaths
YT: Demonetized.
Keep the videos coming. I find these experiments interesting.
Hrm. Well, if that con-di nozzle is shaped correctly, it will actually end up as a flow limiter. In airplanes, they use a 'sonic venturi' as part of the cabin pressurization system, the airflow going supersonic acts as a limit to how much airflow goes through the cabin instead of into the engine.
That Trebuchet throws things really straight and level! Surprisingly good performance in damage going that slow. IMO they would go through the lead plate and vest if you speed them up to 1200-1400FPS.
Yes! Love the whistlers. It’s satisfying hearing it like a nerf dart whistle. Would be fun to hear it shot at a longer distance to see how long it’d whistle. Hope the video pleases the YT monetizing gods!
Neutered TAOFLEDERMAUS is still entertaining and educational!!!!!
The first round likely exceeded what is known as the critical mach number for the projectile. Trans sonic air flow happens because the air must move up and over (around) the surface of the projectile, thus increasing the airspeed over the outside of it.
Don't give up guys, your channel is AWESOME. We'll beat them in time
It's funny, accuracy is a small portion of the video, the real focus is of how the projectile preforms and reacts to different velocities, we can all sit in a classroom and be lectured about what someone studied, what they thought, and then hear the spin on their conclusion. the High speed camera shows what is going on and that is the point of the video, Your videos are fun and educational, Interesting and thought producing to the viewer. Not many channels do this Jeff, you are providing content that is original and not something that someone else done. One thing that is shared among your viewers, we never get tired of seeing your videos. Keep up the great filming and content.-Dave
thank you Dave!!
You guys are AWESOME. 🤘👌😎
P.S: I had a cracking time watching that vest running around like a scared dog on the night of the 4th of July during fireworks.
I'm pleased that you are using a sophisticated launching device.
NEW TEST PLEASE: Do the high velocity ones (where the plug stays in) fly the same distance as the low velocity ones (where the plug comes out and it whistles)? What I'm wondering is if the low pressure jet coming out of the nozzle helps it to generate some sort of lift. Or, if it doesn't stabilize and prevent tumbling, that should result in more distance.
The whistle from 10:47 has to be your new go to sound effect for things that go boom
Over distance these may help. As the round slows the air flowing through may keep it aloft for a bit longer.
Aerospace engineer specializing in high-speed, high Mach number flows here. Just FYI, you’ll never get sustained accelerated supersonic flow through the nozzle projectile. You’re correct that if it’s traveling at supersonic speeds you’ll have choked flow in the nozzle throat with a standing normal shock there or a detached bow shock like you explained.
But even in the projectile is transonic or subsonic accelerating the flow through the inlet is impossible because that would violate the 2nd law of thermodynamics: the free flying projectile would be creating thrust and therefore doing work which is creating energy from nothing. (Note: The thrust does *NOT* need to be greater than the drag force; even if the projectile is still decelerating, albeit less aggressively, by hypothetically accelerating a volume of air traveling through the nozzle it is doing work for free.)
In practice there is no way to cause the he flow to speed up without an onboard energy source. If there were, you would have fuel-less ramjet vehicles flying around “for free” after the initial acceleration.
In practice to accelerate the flow you need a higher “total enthalpy” which is created by adding heat (usually chemical energy, aka JP1 or RP1) in jets, ramjets and rockets.
I very much appreciate this video, TAOFLEDERMAUS. Thank you for continuing your exploration of physics despite the difficulties RUclips has afforded you while presenting this art for which you are passionate about. RUclips, please support your artists. You have the power to do so.