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    shooting chronometer


    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!
    African Archer

    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.

    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!
    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

    Post by Sponsored content

      Current date/time is Sat Mar 17, 2018 2:05 pm