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    RDT (Reverse Draw Technology) crossbow building

    patandjali
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    Post by patandjali on Sat Mar 29, 2014 11:49 pm

    Reverse bow system has many advantages besides classic crossbow:
    -center of gravity of the crossbow is exactly in the middle
    -Is much narrower, it can maneuver more easily
    -no shock at shooting
    -in a relatively short crossbow very long Power Stroke.
    -long Power Stoke- higher speed.

    Materials

    materials we need to build
    - aluminum-plate 8 mm
    - leaf spring 6mm
    -hardwood
    -bowstring materials
    perseverance Very Happy 




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    Post by patandjali on Sun Mar 30, 2014 12:14 am

    LINK fixed
    https://www.youtube.com/watch?v=JPc1tAUo01E


    Last edited by patandjali on Sat Jun 07, 2014 10:51 pm; edited 1 time in total
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    Post by patandjali on Sun Mar 30, 2014 12:21 am

    some pictures
    http://www.kephost.com/view3.php?filename=a1_2014_3_30_xwsersmnlm.jpg
    http://www.kephost.com/view3.php?filename=a1_2014_3_30_xq08oqtcmf.jpg
    http://www.kephost.com/view3.php?filename=a1_2014_3_30_ki4jdb6de4.jpg
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    Post by phuphuphnik on Sun Mar 30, 2014 4:49 am

    That is a  mean looking little bow! Is there a cocking assist, or is it hand spanned? I was looking at modern crossbows ( a Barnett Razr), and they were very front heavy, the balance you describe would make for more precise shooting.  
    cheers,
    chriso


    Aceasta este o medie în căutarea arc mic! Există o armare asista, sau este calibrat mână? M-am uitat la arbalete moderne (un Razr Barnett), și au fost foarte grele din față, echilibrul pe care o descrieți-ar face pentru fotografiere mai precise.


    Last edited by phuphuphnik on Sun Mar 30, 2014 5:04 am; edited 1 time in total (Reason for editing : tranlated to Romanian)
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    Post by Todd the archer on Sun Mar 30, 2014 7:39 am

    Great job, well done!

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    Post by Hotspur on Sun Mar 30, 2014 10:36 am

    Very nice! 

    Is there anything you would change?
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    Post by patandjali on Sun Mar 30, 2014 11:01 am

    Link fixed
    https://www.youtube.com/watch?v=qYLzUSHT7QY


    Last edited by patandjali on Sat Jun 07, 2014 10:53 pm; edited 1 time in total
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    Post by MRobin on Mon Mar 31, 2014 4:52 am

    Damn nice, what speed?
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    Post by Anatine Duo on Mon Mar 31, 2014 8:12 am

    pretty nice, always great to see handmade cams!
    patandjali
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    Post by patandjali on Tue Apr 01, 2014 9:35 pm

    Thx,boys Smile 

    The arrows ballistics test on the top.
    http://www.excaliburcrossbow.com/content/arrow_ballistics
    https://www.youtube.com/watch?v=gpLxB2sFYs4&feature=youtu.be
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    Post by phuphuphnik on Wed Apr 02, 2014 4:39 pm

    I built one of these coil chronometers. It works well until you shoot one of the coils...

    http://www.archerytalk.com/vb/showthread.php?t=1485256
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    Post by Hotspur on Wed Apr 02, 2014 6:55 pm

    There is the tried and true ‘click-thwack’ method of determining average bold speed:
     
    Put your cell phone in the middle of the range (try not to shoot it).  The middle of the range cancels out speed of sound error.
     
    Turn on an audio recording app.
     
    Shoot.
     
    Look at the audio file ‘click-thwack’ in Audacty  http://audacity.sourceforge.net/ and measure the milliseconds of flight time. 

    RDT (Reverse Draw Technology) crossbow building Audacity_zps168b422d
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    Post by phuphuphnik on Thu Apr 03, 2014 12:33 am

    Hotspur, that is brilliant!
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    Post by Hotspur on Thu Apr 03, 2014 7:48 am

    I wish I could take credit, but I swiped the idea here somewhere Smile

    A couple of tips: download an app that records in an Audacity friendly format like mp3.

    The button second from the top right 'Fit Selection' zooms in to whatever is highlighted.  Then if you highlight your shoot sound the time is displayed in the bottom centre readout.  In the photo it says .247, my range was 50 feet so: 50/.247 is 202 feet per second.

    Important to note this is the average speed and not a chronometer muzzle velocity.  Some smarty-pants math type might be able to write us an Excel equation to calculate muzzle velocity? Anyone? Smile
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    Post by patandjali on Thu Apr 03, 2014 12:14 pm

    Thank you Smile 
       305 fps arrow broadheads(650 grains) 325 fps arrow > 540 grains ,350 fps arrows >460 grains Very Happy


    Last edited by patandjali on Sat Jun 07, 2014 11:02 pm; edited 1 time in total
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    Post by Hotspur on Thu Apr 03, 2014 5:57 pm

    patandjali wrote:Thank you Smile 
    325 fps arrow 30 gramms Very Happy 

    Wow, very nice!
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    RDT (Reverse Draw Technology) crossbow building Empty Cam questions

    Post by Hermit on Sun Apr 06, 2014 8:24 am

    I have no experience at all with cam action bows,so have some questions about how this bow is strung.
    1)Is the string a closed loop
    2)If the string is not a closed loop,how is is secured.From the photographs,it appears to to be fixed somehow to the small cams.If it's possible,a photograph showing how the string is secured would be extremely helpful,and very much appreciated,as I am completely stuck on this.
                                    Hermit.
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    Post by patandjali on Sun Apr 06, 2014 12:29 pm

    Here you are,if you'll help
    http://www.kephost.com/view3.php?filename=a1_2014_4_6_560zpei5e7.jpg
    http://www.kephost.com/view3.php?filename=a1_2014_4_6_ywdgn9h3ph.jpg
    http://www.kephost.com/view3.php?filename=a1_2014_4_6_o962k6d629.jpg

    https://www.youtube.com/watch?v=RMKS4lL8sG0
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    Post by phuphuphnik on Sun Apr 06, 2014 12:37 pm

    Those cams are wonderful sir ಠ_ರೃ
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    Post by Hermit on Mon Apr 07, 2014 8:16 am

    Thank you Patandjali,that was the last piece of the puzzle,all that is left to do now,is gather materials,make the cam templates,and build.I am sure I'll come across problems and snags during construction,but thanks to you,I know they can be overcome
                                                               Hermit.
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    Post by patandjali on Mon Apr 28, 2014 10:51 am

    Hello !

    Technical problems internet and were the old channels  study 
    but I made a new one if anyone's interested   
    https://www.youtube.com/channel/UCghexPjgEWvlx2jLBNQWruQ

    Have a nice day !
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    Post by jaeger22 on Mon Apr 28, 2014 11:20 am

    Thanks patandjali, very nicely done!! cheers 
    And I can't tell you how impressed I am with your build! Just outstanding! cheers  cheers
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    Post by patandjali on Sat May 17, 2014 10:01 am

    Penetrations test , very fast
    https://www.youtube.com/watch?v=bZZeHJ0zCGE
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    Post by patandjali on Thu May 29, 2014 11:30 am

    Greeting Gentlemens !

    If someone wants to build arrow, are very resistant  Very Happy 
    https://www.youtube.com/watch?v=ftlCyyeLZE4
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    Post by Pellethuntr on Fri May 30, 2014 9:28 am

    That's some great stuff you are working on can't wait to see more!

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