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Technical A Point Blank Range Calculator ...

Discussion in 'Anything Airgun Related' started by GPConway, Mar 25, 2020 at 8:37 PM.

  1. GPConway

    GPConway Engaging Member

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    Location:
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    I contributed to @cemlyn’s ".20 Zero Range?" thread recently by using the Android version of my MERO app. Simple enough (but more work than it should have been) so I took the MERO modules apart and reassembled only the relevant bits to make the PBRCalc Android app.
    As a side effect - and because some folk like to quote muzzle energy instead of velocity - it also does a grand job of the calculating one of the Muzzle Velocity/Projectile Mass/Kinetic Energy values given the other two. Tap the title of the value to calculate (to select it), enter values into the other two and Bob’s yer uncle.
    PBRCalc iterates the Point Blank Range by juggling the Muzzle Velocity, Sight Height, Zero Range, Ballistic Coefficient, the applicable Drag Law and the Environmental factors. The app's set up such that, having entered the MV, SH, BC, etc., on entering a near (or far) Zero, the app calculates the Killzone Diameter and the PBR. Alternatively, entering a value for the Killzone Diameter calculates the corresponding PBR and the near/far Zeros.
    I've also included the inevitable Environmental, Graphs and Table views because, well, it'd be rude not to. :rolleyes:

    Screenshot 2020-03-25 at 21.08.06.png

    PBRCalc can be downloaded from my web space (here) or my DropBox (here) for side-loading into Android devices running Android 4.1 and later.

    Constructive criticism is as welcome as always. ;)

    George
     
    Last edited: Mar 25, 2020 at 8:44 PM
    Figgy, SlyM1ke, cemlyn and 7 others like this.
  2. Deejayuu

    Deejayuu Donator

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    Many thanks for sharing. A great self teaching aid for us dummies.
    P.S. Good fun too!
     
  3. gb2017

    gb2017 Busy Member

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    Morning George

    cracking program, many thanks, deals with all of the stuff I try and extract from chairgun

    Only thing from my perspective is, could you add an easy export to csv / txt file function please?
     
  4. GPConway

    GPConway Engaging Member

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    Thanks for the suggestion. :up:
    I haven't done anything like that before (I'm a newbie Android hack) but I'll have a mooch around t'Internet for inspiration. A choice of exporting the table/graphs to file or to email would be useful I reckon.
    I feel a whole new module coming on ... :)

    George
     
    phil.m and gb2017 like this.
  5. Spray1Mark

    Spray1Mark Pro Poster

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    Interesting on the PBR a concept I was a proponent of for many years back in the day, although in all fairness I am not sure I would trust it with an airgun, simply down to how much more affected by wind it is VS a centerfire.
     
  6. gb2017

    gb2017 Busy Member

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    I quite like the pbr concept but as there is no wind speed taken into the equation, is this not just a vertical gauge for PBR in this instance? or am I missing something?

    I know for my shooting ability I haven't got good enough (hopefully will though) to worry about wind especially at the range I shoot at that seems to have different wind directions within a very short span ie 35 to 45 to 60 yards
     
  7. GPConway

    GPConway Engaging Member

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    That's certainly a point of view. Although we're referring to the killzone as a 'diameter' I guess it's really a simple vertical line. Under the influence of a significant crosswind vector the point of impact would shift laterally and one would deal with the lateral deflection in the usual manner. I don't see that the vertical wind-induced deflection (Aerodynamic Jump) being significant with airgun ammunition and at airgun zero ranges though.
    Opinions may vary of course but my sums indicate that's the case ...

    George
     
  8. GPConway

    GPConway Engaging Member

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    I've added the facility to email a .CSV version of the Ballistics/dynamics Table to yourself (or someone else for that matter :)). I've been trying to do the same for the graphs but, despite trying for a couple of hours, it's still defeating me. Must try harder ... :oops:
    Maybe that'll be in V1.0.3.

    PBRCalc_3.png

    PBRCalc V1.0.2 is available from my web space (here) or my DropBox (here). If you installed V1.0.1 then you'll probably need to uninstall/delete that version before installing V1.0.2.

    George
     
    gb2017 and cemlyn like this.
  9. cemlyn

    cemlyn Active Member

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    Thanks @GPConway
    I’m glad I asked the question now I will have my daughter have a look and download it for me! I can only just about manage get on here! I’m chuffed that I can type this I’m useless at technology
    Thanks cemlyn
     
  10. gb2017

    gb2017 Busy Member

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    Morning George

    thanks for the update, shame I am such a dumba55, couldn't find the icon at first then realised I had to be in the table to see it :facepalm:, then once I jumped that minor hurdle realised I don't have an email client as I am running it on bluestacks, will have to work out how to load it on my phone

    thanks though

    PS do like the instant conversion by clicking the green buttons, very nice!! :up:
     

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