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What goes up must come down

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  • What goes up must come down

    I was watching "Myth Buster's" episode tonight in which they were testing whether a falling arrow will be lethal or not. As it so happens, I had an experience about 30 years ago that pretty much answers the question, IMHO.

    I had parked my 1970 or 71 GMC 3/4 ton 4x4 on the top of a ridge, I had walked down the ridge about 30 or 40 yards when I spotted a squirrel up near the top of a tree. I decided to shoot him with my bow, I cleanly missed him. didn't clip any branches or leaves (pine tree), so the arrow just kept flying. I was probably shooting at 75 degree's, almost straight up. Later when I returned to my truck I found my shaft sticking straight up in the hood.

    I was using field points, not broad heads, and the 24.5" shaft was an 1816 aluminum. so not very much spine for the 68 lb. compound bow I was hunting with. But because I was shooting such a light shaft, I could get some very impressive velocities for that time in the archery game. That bow with my short draw length and light weight 1816's shafts would shoot right around 270 fps., so I'd imagine it went pretty high, which resulted in it reaching maximum velocity on the way down.
    ,
    What blew me away, is that the shaft didn't just pierce the hood, it buried the shaft about 4" or 5". What's more, the body metal on those old 1970 / 1971 GM trucks was heavy. That said, if I had been struck in the head by that shaft I'm pretty confident it would have busted through my skull. Myth Buster used a bow that was only shooting about 130 fps and reaching an altitude of around 300', if I recall correctly, where as mine was definitely shooting much higher, at 270-ish fps..

    SMOA

  • #2
    Seems right to me. We use to have pumpkin shoots, 200 yards..penetration complete. About the size of a human head.

    Many of MythBuster's so called experiments were not scientifically correct; and there conclusions were incorrect.

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    • #3
      When I was in Los Angeles the Happy New Year shots fired up into the sky always managed to hit someone on their way down. This would be gravity acting upon a handgun or rifle bullet, probably close to an arrow in weight. Killed a few as I recall.

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      • #4
        That's not a myth, it's simple physics. It's going to return at the same velocity with which it went skyward.
        If it weren't for double standards, liberals would have no standards at all.

        "Ammo and really good friends are hard to find in a gunfight so I bring them with me" E. J. Owens

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        • #5
          Originally posted by Ozark Ed View Post
          That's not a myth, it's simple physics. It's going to return at the same velocity with which it went skyward.
          Maybe, but most probably not.
          Terminal velocity is reached when a falling object's drag equals the pull/acceleration of gravity. Velocity of an arrow or bullet shot upward is going to exceed what can be achieved by terminal velocity. The pull of gravity will stop the upward motion, aided by drag, then it (gravity) will accelerate the object to it's terminal velocity, which will be limited by drag. A free-falling human in a normally flat position will achieve approximately 120-125MPH due to drag, but if the human assumes a more aerodynamically perfect shape, such as head down, arms and legs tucked for streamlining, the sky diver can reach speeds upward of 300mph.

          Go here: https://en.wikipedia.org/wiki/Terminal_velocity for a fuller explanation.
          Wimachtendienk, Wingolauchsik, Witahemui

          He who knows not and knows not that he knows not, is a fool.
          He who knows not and knows he knows not is wise.

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          • #6
            YUP!
            I had a happy 4th of July 45 caliber bullet some one fired come down through My car port steel roof and smash my cars windshield this year.
            shoot\'em till your arm falls off

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            • #7
              Right on Yeller. But us fat SD can get up to 150 mph still trying to act like a shutlecock.

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              • #8
                Should have mentioned, IF we neglect air, in a vaccum all object fall at the same rate and speed regardless of size, shape, weight. So if you were to drop a feather and lead ball at the same time in a 100 foot verticle tube having in a no air (vacuum). Both hit the bottom of the tube at the same time and at the same speed.

                Might not seem right...but that is the way it works.

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                • #9
                  We used to shoot judo points straight up, with recurve and try to catch them as they went past. I don't really understand why we kept getting bows taken away. By the way don't try this at home, they leave nasty cuts.
                  Quote from the Rev. Martin Niemöller, a Holocaust survivor:

                  First, they came for the Socialists, and I did not speak out -- because I was not a Socialist.

                  Then they came for the Trade Unionists, and I did not speak out -- because I was not a Trade Unionist.

                  Then they came for the Jews, and I did not speak out -- because I was not a Jew.

                  Then they came for me -- and there was no one left to speak for me.

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                  • #10
                    Originally posted by BEAR View Post
                    Should have mentioned, IF we neglect air, in a vaccum all object fall at the same rate and speed regardless of size, shape, weight. So if you were to drop a feather and lead ball at the same time in a 100 foot verticle tube having in a no air (vacuum). Both hit the bottom of the tube at the same time and at the same speed.

                    Might not seem right...but that is the way it works.
                    Perzactly, rightamundo Bear.
                    And lots of people don't believe a bullet shot horizontally level will hit the ground at the same time it's twin is dropped from the same height.
                    Wimachtendienk, Wingolauchsik, Witahemui

                    He who knows not and knows not that he knows not, is a fool.
                    He who knows not and knows he knows not is wise.

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                    • #11
                      Originally posted by d45/70 View Post
                      YUP!
                      I had a happy 4th of July 45 caliber bullet some one fired come down through My car port steel roof and smash my cars windshield this year.
                      All I can say is,, It wasn't MY .45 slug.

                      Yes,, a bullet fired up will not necessarily fall back wit the same velocity it was launched with, it will have whatever it gets from gravity until it's own air drag resistance meets the pull of gravity., then acceleration stops.

                      Without the atmosphere, yes, it would come back having regained whatever it lost to the gravity well on the way up..

                      Noting the skydiver bit...... High Altitude jumps can get over 200mph due to the lack of air resistance, even stretched out flat, as they head deeper into the atmosphere, closer to the ground, they slow down due to the increased resistance going through the thicker air.

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