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Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

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» 12th Century Chinese Crossbow Chronographed
by stuckinthemud1 Fri Nov 24, 2023 3:50 pm

» Crossbow Stock
by kenh Tue Oct 31, 2023 6:19 am

» Colletiere a Charavines continuing experiment
by stuckinthemud1 Sat Oct 07, 2023 5:36 am

» Cocking - how
by stuckinthemud1 Thu Aug 03, 2023 4:24 am

» Questions around heavy crossbow lath buildin
by stuckinthemud1 Wed Apr 26, 2023 1:10 am

» Arab Crossbow
by stuckinthemud1 Tue Apr 25, 2023 7:57 am

» prod angle, and lever trigger for sale anyone?
by stuckinthemud1 Mon Mar 20, 2023 5:54 am

» flexible string
by jasper1978 Mon Mar 20, 2023 1:25 am

» [solved]Skane/Lillohus crossbow thread
by stuckinthemud1 Sun Mar 19, 2023 7:44 am

» jens sensfelder
by jasper1978 Wed Mar 08, 2023 11:58 pm

» 400lb Windlass crossbow bolts weight and accuracy shooting high.
by stuckinthemud1 Sun Mar 05, 2023 2:53 pm

» Codex Löffelholz crossbow
by stuckinthemud1 Tue Jan 24, 2023 4:14 pm

» Digitar prodsc
by stuckinthemud1 Sun Jan 15, 2023 2:42 pm

» Troubleshooting
by Andy. Fri Jan 06, 2023 12:29 pm

» Wood Prods
by stuckinthemud1 Fri Dec 30, 2022 12:47 pm

» Colletiere a Charavines crossbow
by stuckinthemud1 Fri Dec 30, 2022 8:54 am

» Simplified Löffelhotz speedloader
by stuckinthemud1 Fri Dec 09, 2022 4:05 pm

» Fiberglass H-bows
by c sitas Sat Nov 12, 2022 8:44 am

» Bad Antler
by drawknife Sat Nov 12, 2022 3:48 am

» Anyone make their own bolts?
by Juniper Mon Oct 17, 2022 8:20 am

» Josef alm in English
by Juniper Sat Oct 15, 2022 4:22 am

» Qin/Han lock drawings
by kenh Fri Sep 23, 2022 8:16 pm

» stirrup dimensions?
by stuckinthemud1 Thu Sep 01, 2022 1:49 pm

» Skane/Lillohus lockbow information needed
by stuckinthemud1 Sun Aug 14, 2022 6:23 am

» need help contacting le musee Dauphinois Grenoble
by stuckinthemud1 Sat Aug 13, 2022 3:22 pm


3 posters

    shooting chronometer

    avatar
    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 Empty shooting chronometer

    Post by quantum1024 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
    African Archer
    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 : 43
    Location : durban south africa

    shooting chronometer Empty Re: shooting chronometer

    Post by African Archer 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.
    avatar
    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 Empty Re: shooting chronometer

    Post by quantum1024 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!
    Hotspur
    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

    shooting chronometer Empty Re: shooting chronometer

    Post by Hotspur 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.

    Sponsored content


    shooting chronometer Empty Re: shooting chronometer

    Post by Sponsored content


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