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Suppressor in Slow Motion – Smarter Every Day 204

– A quick caveat before
we get started here, I do not want Smarter
Every Day to be observed as a channel that glorifies weaponry. I am just fascinated by fluid dynamics, ballistics, optics, mechanics, aerodynamics. All this stuff is just fascinating to me. And I am hard-pressed to
find one singular thing that I can study that wraps
all these physical phenomenon into the perfect Venn
diagram that tickles my brain quite like firearms. So, that’s why you’ll see me
studying firearms so often and I hope you realize that
I’m doing it as intelligently and respectfully as I can. That being said, I’ve
made some observations in the last episode and
I’ve learned some stuff. And I’ve also decided to
push it a little further by studying suppressors. So, let’s look at this and
try to get smarter everyday. First, let’s revisit what we
learned in the last episode. Using a phantom camera with a
clever photography technique called Schlieren, which is
German for streak by the way, we observe that the
supersonic bullet creates an angular shot cone and
the angle of that cone can be used to determine the mach number. We also learned from
Dr. Konigstrasse at UAH that a bullet travelling
in the transonic regime can create supersonic flow around it because the air has to speed up and rush around the outside
of the surface of the bullet. This is a connection I
didn’t make at the time but we’ve all see these awesome pictures of a fighter jet with this
cone of vapor behind it, this is totally why that happens. The jet is flying along
in the transonic regime just like that bullet and
just like the normal shockwave that occurs on the side
of the subsonic bullet that’s happening on the jet. And it does two things, number one, it makes this cone of
vapor form on the jet and number two, it makes
me all tingly inside. Okay, so I think we have
a good understanding at this point of shockwaves
created by a bullet itself. You may have heard someone talk
about the crack of a bullet as it passes, that’s
created by this shockwave. But if you think about
the bang of a gunshot, it’s all those rapidly expanding gases out the front of a muzzle right? So it’s time to hone in
on that area right there and study that with super schlom, super slowmo suppressor
Schlieren, there you go. It’s hard to say. In a past episode of Smarter Every day I asked a company to fabricate
a see-through suppressor so we could see the flame front propagate through the baffles and try to
understand what was going on. That was effective in showing
what happens on the inside of their particular suppressor design but what I wanna see
is exactly what happens on the outside of the suppressor, after all, that’s where all the noise is. Here’s my friend Coop firing his rifle chambered in 300 blackout, both
suppressed and unsuppressed. I want to show you a full
minute of slow motion video because I believe it does
the best job of explaining the physics of what’s going on. On the left we have a suppressed weapon and on the right we have the
same weapon unsuppressed. When they’re first fired
you can see straight away that the weapon on the right
seems to have a larger, dirtier blast but after four milliseconds there doesn’t seem to
be any more shockwaves, we’re just venting the
exhaust gases at that point. The weapon on the left,
however, is still chugging away. It’s like this initial
blast is bouncing around on the inside of the suppressor and just a little bit of the gases are being leaked out
with every reverberation. (gunshot echo) Watch what happens next though. On the right, the echo from
the unsuppressed weapon is huge and very distinct. You can see how powerful and singular that initial blast was by how sharp the echo is when it returns. Imagine that echo entering your ears, meanwhile you can still see
that the suppressed weapon is dissipating that
acoustic energy slowly. This is like the clearest
example I can show of that energy being
dissipated differently. On the right, the unsuppressed version, the whole thing’s over in
a millisecond and a half but on the left, the same acoustic energy is dissipated over 15 milliseconds. That is a direct comparison showing you that it almost acts like
a capacitor in a circuit, it’s like, slowly filtering
the energy as it exits. Anyway, that energy dissipation
does not come for free. Suppressors heat up very, very quickly. All that thermal energy is captured because it doesn’t dissipate
away from the weapons. So the problem with suppressors is if you fire enough rounds through ’em, they heat up very, very fast
and they can cause malfunctions and even damage to the weapon. Now let’s look at subsonic ammunition being fired from a suppressor. This is absolutely fascinating. Okay first observation. The first thing that leaves the
suppressor is unburnt powder and look at that, there’s
little baby shockwave, they’re supersonic. Now whether this is gunk coming loose from previous shots, or
whatever, I don’t know but it’s clearly supersonic. Second, did you see
that little vortex ring poot out the end? Okay, here we go, bullet time. We know this is a subsonic round so we’re expecting normal shockwaves on the sides of the
bullet but look at that. They’re not there until the bullet is several inches away from the muzzle. It is crazy to think about how complicated this flow environment
is but it’s really fun to make these observations
and try to figure it out. This episode of Smarter
Every Day is sponsored by Hello Fresh. Hello Fresh is a meal kit delivery service that sends ingredients
to your house in a bag and you get a little instruction thing and you go through and
you get to make food at your house that you
wouldn’t normally cook. It’s a subscription
service, we can pause it if we go out of town. It really works for us. Is that, what are you doin’ right now? Does it say use your hands? – No it didn’t, it just says to mix. – Have you ever eaten a jalapeno? – No. – Today’s the day buddy. – Mummy’s gonna have her burger
without jalapenos (laughs) – You can’t deviate from the recipe. – Yeah, yes I can (laughter) – Hello Fresh is America’s
number one meal kit service and right now it’s coming
in at about 6.99 a serving which is really, really affordable so you get to try new food you get the stuff sent to your house so you don’t have to worry about shopping. That’s your favorite part, right? – Absolutely! – You don’t have to like… – I don’t have to shop. – (laughs) Awesome. Get started with six meals free by going to
and using the promo code smarter60 for a total of 60 dollars off. That’s two free meals in each
of your first three boxes. Big thanks to Hello Fresh for
sponsoring Smarter Every Day and for making this happen. I really like it when this happens and yeah, give it a shot. I think you’ll dig it with
your family, it works for us. What are these little squirrely things that come out of the suppressor? – Okay, so what you’re seeing here on this blackout cartridge
is your seeing unburnt propellant leaving the
muzzle before the bullet goes and so for 300 blackout
optimally you get complete burnout around 9 1/2 to ten
inches of barrel length. So this is a 10.2 inch barrel length so we’re right on the threshold of burning all the propellant out before
the bullet leaves the muzzle. – But look, there was a
supersonic piece of powder – Yeah there is. – You see that? – Whoa! – This is insane, we’re just
like, learning important stuff. Alright, well that was delightful, what did we learn John? (laughs) – Propellant outruns bullets sometimes. You may have grains of propellant that exit the muzzle faster
than the bullet, supersonically. – That’s crazy, and there’s
a shockwave on those grains of propellant
– Exactly! – That’s uh, never
would have thought that. – Neither would I. – I hope this episode
earned your subscription. You can also click the bell to be notified any time I upload
something, or not, whatever. You’re a smart person, you
can make your own decisions. I’m Destin, you’re
gettin’ smarter every day. Have a good one.

100 thoughts on “Suppressor in Slow Motion – Smarter Every Day 204

  1. You do a good job of balancing looking at and respecting firearms, while also geeking out over the science behind them.

    P.S. Got accepted at UAH!

  2. You shouldn’t feel the need to tip toe around those who may be offended by any since of a firearm. Rather disappointed to have seen you do that.

  3. PLEASE: before any video including shooting guns ..please explain first what safety measures you are taking before making the video. We know you are being safe …but for the average viewer who easily ignore how many cars we see in the video and what all you guys do before like making sure shooting on the right direction where theres no ppl around or bullets can go lost…Again we know you've been safe theres too many stupid ppl out there that misuse weapons and dont pay attention to small details like that. We love your videos and we dont want to know that somebody tried to recreate one of your videos ending up on tragedy and then your channel get deleted because of that. GBU👍🏽

  4. Do you support the 2nd amendment??????????????????????? I think you do. why don't you just come out and say guns are awesome. and EVERY HUMAN BEING, as long as law abiding and mentally sound, to own one?
    Just say it

  5. The initial poof in the sub sonic is likely the air ahead of the projectile being forced ahead of it.

  6. I would love to meet you. I'm at FT. Rucker and I think almost all of us here would love to meet you. Please let me know if you want to come down here and we may have an aircraft that you can get on.

  7. Considering the bullet is press fit (slightly squeezed by the bore) I would be willing to bet that if you shoot the subsonic round without the suppressor you would see less particulate matter exit in front of the bullet.

  8. Чуваки, угол наклона туннеля в пирамиде Хеопса находится примерно под таким же углом! ~27°

  9. It’s totally fascinating to us too. Ballistics is physics and helps explain many hard things my little head needs feeding with.Smarter Everyday. So no poo poo’ers I hope.
    Lv x

  10. You have the 2nd amendment its your right to use the tools for research and defence I don't see why there is a problem with that

  11. I dont see a problem with glorifying weaponry, its what made our country what it is! there is no reason for people to get upset over it!

  12. you have not answered the questions yet… way to short video and not making people smarter in the distinct way you are usually doing this. 🙁

  13. Good job for addressing that you don't glorify weaponry!
    I was thinking that in the last video of this kind. And I also love this stuff!!

  14. Thank you for not allowing PC culture to dictate your vijas. But it's pretty sad that you have to even say that

  15. This is EXTREMELY far fetched.

    But imagine catching slow motion footage at the moment a bullet goes transonic

  16. Dustin! I love you channel. I have a request: I would love to see if you could take a high-speed camera and have it spin at the right speed and time it perfectly to catch footage of the entire trajectory of a bullet out of a gun to a target! (mind-blowing-emoji)

  17. I am in favor of gun control, I also own a weapon, and the first video I watch from you was the AK-47 underwater slowmo. This is the only channel in YouTube I get notified of any new video because I want to get @SmarterEveryDay
    . Stay Fresh

  18. I EFFIN luv you… are minds are the same your mind thinks exactly like mine it's like hard for us to understand things unless we know all the factors I dont know I know when ever you explain things I dont have to strain my brain it's like I already know what your trying to explain half way thru and I almost think the words you say at the same time or a millisecond before you do! It's so weird!

  19. Those jets sometimes drop bombs and have guns on them. The images you showed were offensive and provided to much glory to a weapon and weapons are offensive to me

  20. So cool! Maybe for a future video about rifle optics detailing the scientific differences between first focal plane and second focal plane rifle scopes?

  21. How nerd people back in 2006 started this without realizing that it would have gone millionaires. Life is amazing!

  22. How nerd people back in 2006 started this without realizing that it would have gone millionaires. Life is amazing!

  23. How nerd people back in 2006 started this without realizing that it would have gone millionaires. Life is amazing!

  24. Not even 2 minutes into this video & I already love the channel. Thanks well done Sir. Totally geeking out on this stuff.

  25. Ok i have to make some assumptions, positive assumptions, but i love that you include your family in your videos, and how they are a part of the learning process. It speaks volumes of how well you were raised by your parents and they have to be very proud. Thank you so much for using the internet for what it was intended to do, educate on the “information superhighway” and get Smarter Everyday

  26. Why put a disclaimer on something that’s won our independence, defeated evil nations, protected women from rape, defended the sick and the weak, and made the elderly equal to younger men?
    Firearms aren’t bad, good men being deprived the use of arms has historically been the problem.

  27. Why are people always apologizing so those who are offended by everything will not feel threatened. "Glorifying guns" is an accusation meant to make people dislike and fear guns. It's a reverse psychology tactic.

  28. as a german gunsmith, i really appreciate your work.
    makes it much easier for me to explain it to my students.


  29. Could you reproduce the same effect using "Toepler's Dual-field-lens schlieren arrangement", might save you some experimental area. I'm planning to develop one for my experimental work, need your suggestions.

  30. I think those initial waves leaving the suppressor is actually the air being pushed out ahead of the bullet.
    If the bullet is being squeezed into the bore, creating a seal before the round leaves the case, then how is it that unburnt powder is getting passed the round? Also keep in mind that the bullet is just slightly larger than the bore to begin with.

  31. Have appreciated your content, but apologizing for analyzing a gun? How about apologizing for the whip vid & slavery? Or for being white? American? Christian? Male? Because the viewers who are confused enough to complain about such "non-things" like the presence of a "tool" on your program, are not the majority. But when you cuck like that to their cause of spreading fear & ignorance, you give "them" the appearance of being the majority, sane, & right, which they are none of. Whether intentional or not that makes you part of "their" cause, & it just goes to show with all the good efforts & intelligence, it still doesn't prevent cowardice. You've obviously read a great deal, so I have to assume you've read some 20th century history. So, you would obviously know how nonsensical it is to assume or believe a "tool" is evil because a microscopic group of unwell people misuse it, & how following any citizen disarmament has been massive loss of life & liberty. Thank you for any knowledge or entertainment you've given me, but I really expected better of such a seemingly intelligent & level headed guy. Unsubbed.

  32. You don't have to excuse yourself for studying firearms, you see stuff in them the average anti gun will never be able to fathom. All they see is what the media tells them, it's dangerous, it kills and you shouldn't talk about it.

  33. I know this is an older video but it would be awesome if you did the same set up but recorded the bullet hitting different materials to see if any shrapnel keeps it's super sonic properties

  34. What would a sonic boom sound like for a different atmosphere than our own? Mars vs Venus. Or maybe a sonic boom in sulfur hexafluoride? Does a Curiosity rover make a sonic boom while entering mars atmosphere if nobody is around to hear it?

  35. It’s ok to glorify firearms. You live in America! 🇺🇸 You STILL have the second Amendment…for now. BTW you work for the military so… 🙄

  36. Would the unburnt propellant cause RESISTANCE to the bullet …or would it provide a low pressure area/"vacuum" for the bullet to "draft" on (like in NASCAR) …or does it have no affect on the bullet at all???

    Just trying to get smarter today.

  37. Wrong, all wrong. According to Hollywood actors and news media gun owners are just a bunch of dumb hillbillies. How can this be? Gun owners are responsible, curious and intelligent! Wow, I've been lied to by my Googlite overlords.

  38. Destin is a Rocketman, he interested in velocity the only thing that safe enough and cheap enough for him to learn about the rocket velocity, supersonic, and "rocket" is unfortunately by observing physic of the same shape and same speed as rocket itself.
    by observing the bullet, blast, and propeller…

  39. Have you ever looked at pcp air rifles (pre charged pneumatic) air rifles. They are vary cool and where actually used by Louis and Clark. Modern pcp airgun use air pressure up to 250 bar+. And now slugs are coming out to get a higher bc projectile. Anyway I think you could make a awesome video on them. Love it as always

  40. So does that supersonic transition around the bullet or projectile destabilize it. Or does that transition zone around an aircraft lead to destabilization?

  41. Oh yeah, you can expect a considerable amount of blow by preceeding the projectile. This is why barrel clearance is critical in high velocity firearms. Their trying to capture as much of the gas as possible. Unfortunately there's a trade off to induce the spin velocity for accuracy the rifling will facilate an increase in escaped gas. I love the Zen of firarms and the deep meditation required to hit your mark at a 1,000 yds. Also with a zeroed rifle a long distance shot east will be a higher shot because your stationary target has moved while shooting west it will land lower on target. This is because of the earth's rotation. Show that to a flat earther for an explanation.

  42. Ah, the libtards. I hate that you feel like you need a minute long apology for being interested in something. That's like the person who says "okay, before I start, let me say I'm not a racist. I even have black friends." Just get on to liking what you like and stop apologizing!

  43. These last two videos have been awesome. I just subscribed and I can't wait to see more. I wonder what a whip cracking would look like on this camera setup?

    Update: just saw you already did a whip cracking video, it was fantastic.

  44. So if you did a piece on swords would you also have to denounce their intended use? The sad part is you had to act cautious about how you presented this one so you didn't offend the leftist dribble..

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