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

Latest topics

» How to measure and cut leather for prod
by Celtic Archer Yesterday at 5:56 pm

» Beware of Alchem
by Geezer Fri Aug 18, 2017 3:38 pm

» Crossbow with built in lever?
by John Edgerton Thu Aug 17, 2017 12:38 pm

» Of Bows and Torsion Engines
by JacobL Mon Aug 14, 2017 12:03 pm

» Early Lever and pin Crossbow
by topfmine Mon Aug 14, 2017 8:56 am

» Crusader crossbow
by topfmine Mon Aug 14, 2017 8:53 am

» First Efforts
by rickraedeke Tue Aug 08, 2017 5:25 am

» aluminum prod
by Phil Abrahams Fri Aug 04, 2017 8:38 am

» First whitetail buck taken with medieval crossbow
by Phil Abrahams Fri Aug 04, 2017 3:38 am

» Airsoft Crossbow
by JacobL Wed Aug 02, 2017 9:11 pm

» Questions about steel prod specs
by JacobL Mon Jul 31, 2017 8:25 pm

» Faking a medieval composite crossbow prod.
by JacobL Mon Jul 31, 2017 8:13 pm

» Airsoft Bow
by JacobL Sun Jul 30, 2017 1:56 pm

» Hello All!
by JacobL Sun Jul 30, 2017 12:54 pm

» Padre Island Bow
by Geezer Wed Jul 26, 2017 12:14 pm

» Blocked pictures by Photobucket
by Crossbowmen Mon Jul 24, 2017 1:33 pm

» Geezer website?
by Geezer Fri Jul 21, 2017 3:01 pm

» Could I get advise on order of operations?
by Bs1110101 Wed Jul 19, 2017 4:02 am

» Renaissance Sporting crossbow
by chaz Mon Jul 10, 2017 12:22 am

» Welcome! Welcome! Welcome!
by Agniznag Sat Jul 08, 2017 12:26 pm

» The Arbalist Guild - Around the World
by Agniznag Sat Jul 08, 2017 11:56 am

» opinions please
by Geezer Thu Jul 06, 2017 10:19 pm

» Hello all!
by Tarzan65 Thu Jul 06, 2017 10:54 am

» Yet another one
by Daniel Levesque Sun Jul 02, 2017 9:37 am

» Renaissance peep sight
by kenh Fri Jun 30, 2017 4:48 am


    shooting chronometer

    Share

    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 : 36
    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!
    avatar
    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.

    Sponsored content

    Re: shooting chronometer

    Post by Sponsored content


      Current date/time is Mon Aug 21, 2017 11:50 am