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Thread: By Request: Guns Underwater video questions answered

  1. #1
    MrPennywhistle
    Guest

    By Request: Guns Underwater video questions answered

    I was asked to join this forum and answer questions about how I made this video:



    Ask away. I dumbed down the setup for the video. Lots of thinking went into it and there's several layers of technical stuff involved. I was also asked specifically if I could provide more detailed video of the high speed underwater shots... I've provided that on my YouTube channel here:

    Semi Auto: Ruger P95DC
    http://www.youtube.com/watch?v=BdsHq_v8EY8
    Revolver - F.I.E. Miami FL Mfg. 38 Special.
    http://www.youtube.com/watch?v=hToKUbjiKbM

    I test fired them remotely after the shots before I fired them by hand again... and yes, I fired them by hand again.

    If you enjoyed my work, I would appreciate it if you subscribe. This sort of thing takes a great effort and I'm not backed by anyone. Click here to subscribe to Smarter Every Day..... please.

    That being said, fire away with any questions!

    Regards,

    MrPennywhistle.

  2. #2
    Thanks for joining, and yes, I just subscribed.

    I had a lot of questions originally, but I've more or less narrowed it down to one "first" question. It all has to do with fact that water doesn't compress. My question right now is how that effects what we're seeing.

    For starters, with the inability to compress, it seems like many parts of the gun are going to be stressed far beyond what would happen normally, as air absorbs some of the force by compressing. On the other hand, the end of the barrel is open, so maybe that wouldn't happen at all, as the water would come rushing out ahead of the bullet. My next thought is water would have to come rushing "in" to fill the void being left behind the bullet. ...but watching the revolver video you just posted, in one frame there is "nothing" and in the next frame the bullet has come out, with a trail behind it, and the gasses are escaping at both ends of the cylinder. That means I'm wrong - but where is the water coming from that must be filling in the void behind the bullet?

    I was also going to ask Chuck if there is a high-speed video capture of a semi-auto pistol, that shows where and how the spent casing is ejected from the gun. I'm wondering if the same thing happens under water.



    I was also curious about what you did with/to the semi-auto gun after filming the video. From the way you've written things, I get the feeling that you're comfortable using the guns, but it's not something you are especially into. If that's the case, I'm guessing you know how to strip the gun down for cleaning, but hardly anyone I've met knows how to take the gun completely apart, which I imagine you might need to so after having it completely under water as you did.

    Lastly, I got to thinking about the special high-speed video camera you used. How did the camera 'sync' with the gun? Did you do that manually? Can you play the video back "frame by frame", so people can talk what is happening in a particular frame? I guess that's a lot easier to do on video than film - not to mention a lot less costly.


    Nice job, by the way - you took care of everything! I don't know what I was expecting to see, but I never imagined it would look like what you captured!

  3. #3
    MrPennywhistle
    Guest
    Alright, several points here:

    For your first question, you should research "cavitation". That will explain why you're seeing bubbles formed and collapsing at different positions. Yes the firing of the weapon shows out gassing differently in water than in air. The amount of gas exiting between the cylinder/barrel gap is higher due to water being much more viscous and massive than air.

    Yes the casing is ejected under water. It's plain to see on the video.

    I thoroughly cleaned the weapons after firing them. The FIRST thing I did however was to test fire them on the fixtures to make sure they wouldn't blow my hand up. Yes I'm knowledgeable on the take down of the weapons, so cleaning them isn't a big deal.

    Syncing the camera with the guns is pretty easy. My buddy just hit a button when the bullet fired. I had the camera running on a continual buffer and accounted for pre-trigger. I have dozens of other methods to do this, most automatic.

    The "frame by frame" videos you're looking for were posted in the top post on this thread.

    Hope this helps.

  4. #4
    Quote Originally Posted by MrPennywhistle View Post
    I had the camera running on a continual buffer and accounted for pre-trigger.
    Aha!!! Cute! Another huge advantage over the film days!!

    I'll go check out 'cavitation' tomorrow. I think that will answer most of the things I was puzzled about. As to the ejection of the old shell casing, I did see it being ejected, but I was wondering if the path it took in air and in water was similar.

    Very interesting - thanks again!

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