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    Slightly modernized chukonu

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    actionbow
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    Slightly modernized chukonu

    Post by actionbow on Tue Sep 18, 2012 1:05 pm

    Hi, I used to be jake-owa here but lost my email address that I originally registered with. That's OK, I like this username better. Some of you might remember my repeater and semi auto crossbows. I really like little automatics and have been building a series of approximately 1/3 scale chukonu. This is the second of 5 that I will be building. I have modernized this a little if n the following ways:

    1. Added lever articulation to avoid the seesaw action that obliterates chukonu strings. This required adding a sliding diaphragm trigger. I made it with a little piece of a saw blade bent and screwed into a slot beneath the release that runs into a steel lump on the tiller.
    2. Added two tiny brushes in the muzzle to keep arrows from sliding out when pointed downward in cock position.
    3. The bow is two layers of Osage backed with tonkin cane and fiberglass laminates.
    4. Added aluminum slide track below the shuttle with steel wire to hold front in place to keep slide action from lifting it.

    Other than that it looks like classic chukonu. I angled the handle and with the extra lever articulation the firing action is about 2/3rds the stroke making this a by faster to shoot than a standard one.
    :
    I have found that mounting bolt heads deeper into the arrow and working arrow shape in a drill chucked to the tip gives me the straightest possible darts which work well up to 50 ft. We play games of "horse" with a target board consisting of 7 5" targets from 30 feet and I often get 7 in 7 shots with a rare strike in the 1" center ring. From 40 feet I can fire 12 shots in about 6 seconds at the 3x3 foot target consisting of cardboard layers and get all of them within a 16" radius through 5 or 6 layers of the cardboard. The bow is less than 20 lbs but is heavily recurved and shaped upward at the tips to reduce tiller friction so it draws and shoots very smoothly. Overall I am very happy with this style of chukonu. I was trying to solve some of the wood issues with these fun weapon/toys to make them even more fun to shoot. I will be making 3 more in this style. I have the patterns cut and glued and am just waiting on more laminates from Three Rivers.

    Thanks for looking. I will post a video on you tube with me shooting some of my crossbows soon if someone is interested can do one of this bow alone sooner.
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    actionbow
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    Re: Slightly modernized chukonu

    Post by actionbow on Tue Sep 18, 2012 1:06 pm

    http://db.tt/vfXWkNAL

    OK...that should work.


    Last edited by actionbow on Tue Sep 18, 2012 2:34 pm; edited 2 times in total
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    actionbow
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    Re: Slightly modernized chukonu

    Post by actionbow on Tue Sep 18, 2012 1:36 pm

    Can anyone else see that?
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    actionbow
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    Re: Slightly modernized chukonu

    Post by actionbow on Tue Sep 18, 2012 1:38 pm

    Dropbox link above


    Last edited by actionbow on Tue Sep 18, 2012 2:32 pm; edited 1 time in total

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    Re: Slightly modernized chukonu

    Post by Rizzar on Tue Sep 18, 2012 1:55 pm

    No, but it intenses curiosity Very Happy
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    actionbow
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    Re: Slightly modernized chukonu

    Post by actionbow on Tue Sep 18, 2012 2:02 pm

    Can you click on that first link I posted again? I changed it and it should go to a folder of shots.
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    Re: Slightly modernized chukonu

    Post by kenh on Tue Sep 18, 2012 6:46 pm

    I can certainly see the folder of photos. What's the prod length there?

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    Re: Slightly modernized chukonu

    Post by jeep on Wed Sep 19, 2012 3:35 am

    Hello action bow. If you go in researches box and look for koreen repeating crossbow you will see that i am also very interested by this system . But I am not natural English speaking and got some time difficulty to understand technical word . Can you make a sketch to explain your trigger setting particularly the little bent saw blade use. Your way to solve the rope friction is very neat ,as you can see in my post the koreen do that giving the prod a rotation possibility . Your system is very elegant.
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    actionbow
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    Re: Slightly modernized chukonu

    Post by actionbow on Wed Sep 19, 2012 9:14 am

    I will do that Jeep. Its a style of trigger I use on all my sliding bows I call a reed trigger. It simply converts slide motion to upward motion.
    The prod is 16" nock to nock. Making a short recurve prod like this is actually quite a feat.

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    Re: Slightly modernized chukonu

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