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Wind shooting

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  #15  
Unread 02-17-2004, 01:46 PM
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Re: Wind shooting

JBM

Thanks, I really appreciate that.

At first glance it appears that that my Thumb-Rule info is off by 4 to 6 inches (on the short side) at 1000 yards depending on the position (near or far) of my situational wind. I'd not considered creating a Scientific Wild Ass Guess (SWAG) factor to account for the increased Time Of Flight (TOF) at distance and how to increase my wind induced deflection numbers. I'll work on that!

I did find it interesting about the angular change continuing to increase after the projectile exited the wind effect area. Appears to be about a factor of 2 as does the 500 to 600 yard deflection as compared to my original Thumb-Rule stuff.

Is this "point mass" calculation/program available in a form that I could use? I'm a little short on higher education skills and am primarily a "poke and hope" type with geometry.
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  •   #16  
    Unread 02-17-2004, 04:41 PM
    JBM JBM is offline
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    Re: Wind shooting

    <BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Is this "point mass" calculation/program available in a form that I could use? I'm a little short on higher education skills and am primarily a "poke and hope" type with geometry.<HR></BLOCKQUOTE>

    Not really. I have a free Windows DLL for download [I get a lot of email saying "I'm not really good at math, but I program..."] and I wrote PM to test it. All I have is a Linux executable.
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      #17  
    Unread 02-17-2004, 09:50 PM
    MAX MAX is offline
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    Re: Wind shooting

    Brad, you the JBM eskimo guy??? What part of Florida? Welcome aboard regardless!
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      #18  
    Unread 02-18-2004, 12:56 AM
    JBM JBM is offline
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    Re: Wind shooting

    Here they are with the .470 BC, 2660 f/s @ STP:

    test_470_10_000_1000.txt
    test_470_10_000_100.txt
    test_470_10_500_600.txt
    test_470_10_900_1000.txt
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      #19  
    Unread 02-18-2004, 06:11 AM
    JBM JBM is offline
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    Re: Wind shooting

    Yep. That's me. We just moved to Pace (a few minutes east of Pensacola).
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      #20  
    Unread 02-18-2004, 07:17 AM
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    Re: Wind shooting

    JBM

    Thanks. I downloaded the MPM 0.9.28... I'll play with it in a bit.

    Wind has always been of great interest to me and I'm working on a program to allow multivector winds and couldn't work out the wind induced acceleration and deceleration components. Perhaps this MPM will bring some things into focus for me.

    /r
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      #21  
    Unread 02-18-2004, 10:34 AM
    JBM JBM is offline
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    Re: Wind shooting

    Keep in mind that MPM does interpolation in a "wind field". You specify the wind at various points and it uses 2D interpolation to find the wind at all points. You cannot very easily turn the wind on and off like I showed in my other posts.
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