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Zeroing your rifle? Ballistics question

Discussion in 'General Infiltration Discussion' started by Keganator, Nov 6, 2001.

  1. Keganator

    Keganator White as Snow Moderator

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    Okay now: Here's a question. What is the standard Zero point for the

    a) PSG-1 and
    b) Robar

    rifles? Anyone know?
     
  2. JamesT

    JamesT sniper apprentice

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    a) probably 300m, could be 600m

    b) should be 1000m
     
  3. yurch

    yurch Swinging the clue-by-four

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    Another interesting question: what is the angle that the rifle is fired at? The, uhh, zero angle, or difference in angle from the sights to the gun...? Thats the best I can put it.
    Another useful peice of information would be the highest point of the bullet in its arc...
     
  4. yurch

    yurch Swinging the clue-by-four

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    p334r t3h mad paint 5k1llz!
    Basic diagram. It would help (to calculate the correct arc of the bullet) to know dimentions of the arc, hieghts, times, angles, anything.
     
  5. Keganator

    Keganator White as Snow Moderator

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    LOL @ Yurch:

    Havn't you ever heard of the Quadratic equation?

    [ -b +- square(b^2-4AC) ] / 2A

    with height = h + v(t) + 1/2(9.8m/s^2)(t^2)

    with h = starting hight of barrel
    with v = starting speed in the x direction
    with t = time in flight

    you can find a v(t) that makes the height = 0 twice, once at 0 and once at some other value for t.

    Then plug that into the equation for distance traveled:

    distance x = (speed)(time)

    With Distance X being how far you want to zero. Walla! instant perfect balistics.

    /me acts like his physics professor.

    You now know everything you need to solve the equation! :D
     
  6. ThunderChunky

    ThunderChunky L337 Cube H@X0®

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    You forgot air resistance, which will turn your fancypants equation into some sort of differential... :p
     
  7. yurch

    yurch Swinging the clue-by-four

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    Not to mention we don't know the angle, ToF, height, or speed...
     
    Last edited: Nov 6, 2001
  8. [SOB]bAd ChIcKeN

    [SOB]bAd ChIcKeN Free-Range Pain the Ass

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    Admit it this is just a plot to Brain Bully us into submission:mad: :D
     
  9. Keganator

    Keganator White as Snow Moderator

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    hmm...air resistance... *fumbles around* ah, here it is. "Can be neglected for simple models"

    I think this is simple enough. :)

    Do I have to solve it instead of doing my physics homework? *sigh* after some sleep, maybe. :D
     
  10. Iceman

    Iceman Who Dares Wins

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    Depends on the person using the rifle.
    If it was me i'd sight the PSG in for around 450 yards, and the Robar for about 700 yards depends on the terain i was shooting in, for example in a forest well 200 yards is ample, but out in the dester where you can see for miles on end, well 750-1000 sounds alot better ;) .

    Iceman.
     
  11. Tiffy

    Tiffy Back to champion the L85

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    Hmmmm I vowed never to post on these boards again, but I can't see ignorance propergated.

    As well as Drag on a bullet, you also have Magnus Lift from the spin of it and well as body lift due to the high speeds involved.

    Drag is probably the BIGGEST factor effecting the Balistics of a bullet. It what makes a 7.62NATO round shoot about 4 miles as apposed to about 75 miles in Vacuum.

    I could give you the formula's to work out the ballistics of any round but I don't have the symbols needed here and you'd need to know not only the Muzzle Velocity of the round but also its spin rate and most importantly its Drag Coefficient.

    To impliment even a simplified ballistics system into INF you'd need to make 5 calculations for the bullet constantly.

    I'm currently looking into a better ballistic model for INF but to date haven't really got anywhere with anything even approaching practicallity.

    The quadratic approach produces a good simplified model of ballistics in vacuum though, and is probably a good starting point.
     
  12. Other Dave

    Other Dave New Member

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    Yay! Welcome back Tiffy!

    Other Dave
     
  13. Keganator

    Keganator White as Snow Moderator

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    Thanks for posting Tiffy, that's what I was looking for. I only know what I've been told :).

    Yeah, I was thinking taking looking at Othelos' RC-50 mutator and fudging around with it a bit to get it to have a bullet arc from the start. I did quote that out of my calculus based physics book...figured it didn't matter too much in making a simplified model, since the maps we play on don't seem to ever have air, wind, weather, etc. I might be able to figure out a good equation if I spend some time on it, and some time with my Math prof ;)
     
  14. yurch

    yurch Swinging the clue-by-four

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    Admit it tiffy, it feels goooood. :D
     
  15. R-Force

    R-Force (IF)

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    Hope you'll stay a little while Tiffy :)...
     
  16. The_Fur

    The_Fur Back in black

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    About lift trough spin, could you explain to me how a symetrical body somehow generates lift? as far as i know a symetrical body will notb generate lift no matter how hard you twist it along it's axis.
     
  17. Keganator

    Keganator White as Snow Moderator

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    Fur: Look at a golf ball.
     
  18. Tiffy

    Tiffy Back to champion the L85

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    I'll be honest I don't really understand it enough myself to be able to give a correct or probably even understandable explaination.

    It all has to do with the boundry layer of air around the object. The dimples on a golf ball infact increase the effect and a golf ball travels further due to this effect than a smooth ball of the same weight and size.

    Its called the Magnus Effect if you want to look into it futher.

    Sorry I can't really help much here :(
     
  19. Keganator

    Keganator White as Snow Moderator

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  20. DeadeyeDan[ToA]

    DeadeyeDan[ToA] de oppresso liber

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    That was about backspin. Rifle bullets typically don't have any backspin.
     

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