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    shooting chronometer

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    quantum1024
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 6
    Join date : 2012-12-10

    shooting chronometer

    Post by quantum1024 on Thu Jan 17, 2013 1:00 am

    I can't afford a chrony but have been looking for how to do a speed test, I found this web site
    after countless hours of searching on how to make your own -shooting chronometer. all you need here
    is a PC and sound card and some free software. Enjoy!

    http://www.inpharmix.com/jps/Jims_chrono.html
    avatar
    African Archer
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.

    Posts : 109
    Join date : 2012-07-25
    Age : 37
    Location : durban south africa

    Re: shooting chronometer

    Post by African Archer on Fri Jan 18, 2013 2:27 am

    Iv been working on this exact principal only thing I have found is that the communication with my pc and the diodes is very erratic, once I get it sorted I'll post how accurate it is.

    quantum1024
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows

    Posts : 6
    Join date : 2012-12-10

    Re: shooting chronometer

    Post by quantum1024 on Fri Jan 18, 2013 12:54 pm

    i'm using shielded cable (from some standard cheap headphones which have shielded wire and plug), to reduce noise as well as making everything fit inside a small metal box, (again to shield. this reduces the erratic noise produced by electronic parts and noise picked up at a distance from the detectors to the computer. limit the acoustic noise by shielding as much as possible and it will work fine!
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    Hotspur
    Workshop Savvy

    Did you see my tool collection?


    Workshop SavvyDid you see my tool collection?

    Posts : 150
    Join date : 2012-06-28
    Location : British Columbia, Canada

    Re: shooting chronometer

    Post by Hotspur on Wed Jan 23, 2013 1:40 pm

    I look forward to seeing what you guys come up with. I have done a rough ‘pseudo-crono’ on my bow using Audacity -

    -Measure 20 meters from bolt tip to the target face.
    -Place your smart phone at exactly the halfway point (cancels speed of sound error)
    -Turn on a sound recording phone app. (I first used the phone video recorder but then I had to fiddle around and convert the video file to sound file for Audacity Ed )
    -Shoot (try not to hit your phone)
    -Shoot another half dozen times to be scientific. quake rockets
    -Look at the ‘click-whack’ graphs in Audacity and divide the flight time into the distance: i.e. 20m or 65.617ft/.25ms= 262.468fps.

    The limitation is that this isn’t muzzle velocity, but it gives you a fast dirty idea of where you are.

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    Re: shooting chronometer

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