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Thread: Long Range - 210 yards with Kalibr Cricket .25

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  1. #11
    Join Date
    Jul 2001
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    East Chinnock
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    650
    Quote Originally Posted by Dagwood View Post
    I'm not criticising your maths when you calculate the time an item might drop 32ft under normal conditions, my point is that it doesn't take into account the projectile speed to the target. If I was to shoot the same rifle and pellet at a target 64ft lower than the firing point yet half the distance I would expect the pellet to take half the time and I wouldn't be using gravity to calculate the time taken for the pellet to get there. Of course, as you say if there is a significant difference in height there would be some inclination of the rifle barrel and therefore normal gravity calculations aren't entirely relevant.
    Forgive me if I am missing your point but I still feel it is distance and pellet velocity that are the main factors in calculating travel time and perhaps as you say it has turned out to be a reasonable estimate this time.
    Jim
    Gravity is a constant Jim - drop a stone with one hand and at the same time shoot a high velocity rifle with the other (at the same height above ground and zero elevation) and the stone and bullet hit the ground at the same time. OR drop a stone from 32 feet and shoot a rifle from 32 feet above ground and the stone and pellet hit the ground at the same time - 1.41 seconds after you drop / fire.

    What velocity change does, is depending on which way you look at it, alter the time gravity has to act on the projectile for a given distance OR determine how far the projectile gets before it hits the ground: what it does not do is alter the time taken to hit the ground because gravity is a constant.

    The calculation uses three elements g (gravity), d (distance fallen), and t (time). Know any two of these and you can work out the third - in this case we knew g and d so could calculate t.
    Last edited by Frog; 16-07-2018 at 11:50 AM.

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