AK Underwater With Ultra High Speed Camera

Screen Shot 2013-07-23 at 5.14.56 PM

The ever-ingenious Destin at SmarterEveryDay built a underwater periscope so he could film an AK being fired underwater with a super-ultra-high-end high speed camera that is not waterproof (and probably costs a little less than $1,000,000 to buy outright).

I can’t wait for his next video which will cover Russia’s frogmen guns.

Thanks to OpenSourceDavid for the tip.

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Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.



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  • Samuel Suggs

    His video on “prince rupert drops” is facinateing http://www.youtube.com/watch?v=xe-f4gokRBs

  • Samuel Suggs

    I am personnally surprised he didnt get a “rail gun” or return to battery rest more accuractly for this one but its great anyway http://www.youtube.com/watch?v=p0RaRpKTxV0&list=TLZtbP_0UTrjU

  • MIKE

    THERE ARE FAR TOO MANY TROLLS WITH NO FIREARMS KNOWLEDGE TO CONTRIBUTE ON HERE THESE DAYS.

    • http://www.thefirearmblog.com/ Phil W “Senior Writer TFB”

      I don’t know if we would or should call them trolls if they are here to gain knowledge of firearms. We still have some pretty knowledgeable people.

      • Samuel Suggs

        why was the comment about lighting matches with a bolted down .22 dealeated?

      • Samuel Suggs

        well maybe it wasnt deleated but its gone

      • Samuel Suggs

        have you ever had problems with disapearing commens reported before?

        • Steve (TFB Editor)

          Samuel, I tried emailing you, and I tried asking you to check your email. Your comment posting is excessive. I appreciate the enthusiasm but you need to decrease how many comments you post. That is why your comment was deleted.

          • Samuel Suggs

            Ern, to what degree? I did reduce the number of comments buy and large. I genrally average like 10 comments and responses varey widely. yeasterday I posted three comments and four responses I think give or take 1 or 2 either side. I mean I see your point overall on excessive commenting but I dont see how randomly shaving off comments about lighting matches with firearms encourages me to slow down on the comments. I didnt even know where the thing went I thought it was a technical error. why would I barring any inforamtion to that effect suddenly become the model contributer to the discussion you want me to have in your comment section in response to the sudden and unexspalained dissapearence of my comment that merely attempted to share this video http://www.youtube.com/watch?v=p0RaRpKTxV0 which demo poster do you like the most? I am sorry but what compelled you to do that? what good did you exspect to come of it?

          • Emir Parkreiner

            The argument presented in those loathsome motivation posters is as disingenuous as it is indefensible. Steve contacted you, publicly and privately, to inform you of your excessive posting. He unambiguously explained why your posts were deleted, yet your reply contested that his actions were done “for no reason.”

            The reasons are obvious if you objectively compare your comments to those of other readers. Your comments are inscrutable, bear little to no topical relevance, and have a picture: word ratio on par with an issue of Highlights for Children. That’s not commenting, it’s just making a mess with letters for the world to see.

          • gunslinger

            look at his post count. over 700. in about a month. he’s #2 on the list, behind Phil White (who has over 1000)

            i hate having my inbox flooded with all the posts. if Disqus qould allow us to block posts by users, that would be fine. Samuel could still post, but we wouldn’t have to see it.

          • M.M.D.C.

            Samuel, this is an unkind, personal attack.

          • Samuel Suggs

            I read the E-mail i told that in previouse comments “please read them” I assume you are reafering to a single email?

    • Samuel Suggs

      who are you talking about writers or commenters? and why do you care

      • MIKE

        ATTENTION YOU SEEK…ATTENTION YOU SHALL HAVE.

  • 5

    That’s one way to keep people from peeing in the pool.

  • M.M.D.C.

    His discussion of the Bernoulli principle is interesting. I assumed that there is some “blowby” (gas passing between the bullet and the groves of the barrel) pushing the water out of the barrel ahead of the bullet. It’s hard to imagine why the water wouldn’t act as an obstruction and rupture the barrel otherwise.

    The collapsing bubbles were extremely cool too!

    • gunslinger

      not completely sure on how the ak action works.

      but…i think the general principle is that if you plug a barrel (obstruction) the front/back is not in equilibrium. put the whole thing in water, and all you really did was change the viscosity of the fluid around the action (water is a bit more viscous than air)

      now if you just stuck the tip of the barrel in the water…i’m not sure how that would pan out.

      and of course i could be completely wrong. just my thoughts remembering from highschool and college physics.

      • M.M.D.C.

        “now if you just stuck the tip of the barrel in the water…I’m not sure how that would pan out.”

        I’ve seen shotgun a barrel rupture this way. I also remember seeing an alligator hunter (not on Swamp People) stick half the length of the barrel of a center fire bolt action rifle in the water and pull the trigger. He did this multiple times, killing his catch, with no ruptures. What the heck is going on in there!?!?

        The nerdy part of me really wants to know how all this works. I guess that’s why I love to watch Destin’s videos. =)

        • ducky

          Round chambered and muzzle downwards – you get the principle of a diving bell. Air in the Barrel can’t leave upwards past the cartridge and downwards not either against the pressure of the water. No water is getting in the barrel. Guess he removed the muzzle from the water when cycling the bolt.

  • Lance

    For those 5.45mm torpedoes LOL. This is NOT good for your gun and causes over pressure and can damage or destroy your weapon.

    • Samuel Suggs

      nobody cares

  • Todd S

    This is awesome. I’d show this to my Physical Science classes if I didn’t think the PC police would come down on my head.

  • Aaron E

    That was AWESOME! Very interesting, and yes, I feel a little smarter today.

    There were 2 things not mentioned in the video that I noticed.

    1 – If you watch closely I’m pretty sure you can see the rotation of the bullet through the formation of the bubbles behind it. I’m not a scientist, but it sure looks like the rotation of the bullet is causing the bubbles to form in a spiral manner. Mind you, this doesn’t look like a traditional cork screw because of the expansion of the gases (bubbles) goes in every direction. Instead, the bubbles form in connecting “clouds” getting slightly smaller as the bullet expends energy in the water (best seen at 6:53). These “clouds” can be distinguished like an invisible band is constricting the bubble path at certain points. Like a series of ever smaller cotton balls stacked next to each other, or the snowman look. It would seem that the “constricted” part is where the bullet completes its 360-degree rotation, and then the bubble pattern grows outward again as the new rotation begins. This would seem consistent with special photography of a bullet’s path in air, where the energy wave (ripple) can be seen following the bullet’s travel. Maybe? Again I’m not the scientist, but I’d like to hear one’s opinion on this observation. Cool either way.

    2 – If you watch the travel path of the bullet you can see at about 3 feet past the muzzle the bullet is already higher than the plane of the barrel and even traveling upward (look at 5:24). That is another good look at the spiraling path of the bullet. Again, not a scientist here, but I believe that is a combination of two factors.

    First, the bullet is losing forward velocity at such a great amount that the built up energy behind the bullet expends itself in the path of least resistance altering the bullet’s path – in this case upward.

    A second factor may be the effect of air pressure and water buoyancy. The bullet is heavier and would simply sink if dropped in. However, as the bullet travels very fast through the water it creates a tiny pocket of air pressure in front of the bullet. Since the bullet is traveling fast enough to temporarily overcome the effects of gravity and water pressure, the tiny air pocket allows the bullet to “rise”, much like an airplane, where the air pressure above is less than the pressure below, allowing a large metal aircraft to fly. The “bed” of air that the bullet is traveling on is lighter than the water (bubbles float), creating a pathway that goes ever slightly upward until the bullet’s energy is expended against the water pressure allowing the bullet to sink.

    I’ve heard the U.S. and British Navies are shaping torpedo heads to have a long point instead of rounded head. The science was that the air pocket created allowed for a much higher speed of travel than traditional round nosed heads even underwater. Any thoughts on this hypothesis?