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    Distance from limb/prodholder to string latch?

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    tubis
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    Distance from limb/prodholder to string latch?

    Post by tubis on Sat Apr 20, 2013 1:34 pm

    Hi. First post on this forum.
    A bought these limbs http://www.merlinarchery.co.uk/jandao-crossbow-prod-chase-wind-150-camo.html
    in order to build my own crossbow. But I wonder what the distance it is from the prodholder to the latch of the trigger assembly on the "chase wind"?
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    Re: Distance from limb/prodholder to string latch?

    Post by kenh on Sat Apr 20, 2013 2:32 pm

    I may be completely out in left field here. But that's a pair of limbs for a specific brand of crossbow which has a unique "bolt on" bracket at the front, not a "replacement prod" which is a complete prod ready to install. How do you plan to build the mounting bracket so they can mounted as a prod?

    It says in the product spec that that bow has an 11.2" power stroke. That's the distance from the strung prod string to the latch. What trigger/lock mechanism are you planning to build?

    Frankly I think you'd be better off with a one-piece prod for building a first time crossbow.

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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Sat Apr 20, 2013 2:49 pm

    Limb holder already build a variant of this http://www.crossbow-review.com/ReviewPics/Crossbows/ExcaliburEquinox/100_2866.JPG so i just need to know how long the crossbow should be so the limbs bend as intended. The trigger is a ten point variant that I modified a little


    Last edited by tubis on Sun Apr 21, 2013 1:39 am; edited 1 time in total
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    Re: Distance from limb/prodholder to string latch?

    Post by kenh on Sat Apr 20, 2013 7:51 pm

    You'll want something like a 3" or 3.5" brace height, which you should get by using a stock factory string. To the brace height add the 11.2" powerstroke to get the distance to the catch.

    tubis
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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Sun Apr 21, 2013 1:38 am

    kenh wrote:You'll want something like a 3" or 3.5" brace height, which you should get by using a stock factory string. To the brace height add the 11.2" powerstroke to get the distance to the catch.

    I have the factory string as well Wink

    Is that a general rule or for that pirticular model?

    My own guess was 17" sense thats the length of their shortest bolts and there is a massiv slot for the arrowhead between the limbs?
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    Re: Distance from limb/prodholder to string latch?

    Post by kenh on Sun Apr 21, 2013 8:05 am

    There is an optimum brace height for a given length of prod. Changing it changes several factors -- Search here on "Brace Height". Regular bows use half the bow length as a nominal draw length (powerstroke + brace height) but fiberglass prods can often exceed that.

    Todd the Archer here offers this guideline for brace height:

    "For every foot of bow length (nock to nock) brace one inch plus an inch.

    For example if the prod is 2 1/2 feet long brace it 3 1/2"

    If 1 1/2 foot long brace it 2 1/2"


    The best thing to do is contact the manufacturer.

    tubis
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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Sun Apr 21, 2013 8:55 am

    kenh wrote: Regular bows use half the bow length as a nominal draw length (powerstroke + brace height) but fiberglass prods can often exceed that.

    So, mounted in the riser, knock to knock, the bow is 36 1/2 inch. The limbs are fiberglass. 17" wouldnt be to far out draw length?
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    Re: Distance from limb/prodholder to string latch?

    Post by kenh on Mon Apr 22, 2013 6:36 am

    Ayup. 17" would not be too long of draw. Go for it.
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    Re: Distance from limb/prodholder to string latch?

    Post by Hotspur on Mon Apr 22, 2013 9:31 am

    tubis wrote:
    kenh wrote:You'll want something like a 3" or 3.5" brace height, which you should get by using a stock factory string. To the brace height add the 11.2" powerstroke to get the distance to the catch.

    I have the factory string as well Wink

    Is that a general rule or for that pirticular model?

    My own guess was 17" sense thats the length of their shortest bolts and there is a massiv slot for the arrowhead between the limbs?

    I believe the ‘slot’ in the riser is to accommodate the cock feather’s flight path, not the broadhead (the cock feather of a three fletch bolt).

    When your bow is drawn and the bolt is placed for release, the broadhead will extend beyond the front face of the prod, not inside.
    Like this:
    http://beckettcrossbows.files.wordpress.com/2011/04/cbs-sip1-pix-012.jpg

    tubis
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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Mon Apr 22, 2013 10:13 am

    Hotspur wrote:

    I believe the ‘slot’ in the riser is to accommodate the cock feather’s flight path, not the broadhead (the cock feather of a three fletch bolt).

    When your bow is drawn and the bolt is placed for release, the broadhead will extend beyond the front face of the prod, not inside.
    Like this:
    http://beckettcrossbows.files.wordpress.com/2011/04/cbs-sip1-pix-012.jpg
    The slot, or should i say pit, of the jandao could hardely be for the cock feather...its gigantic? http://www.merlinarchery.co.uk/media/catalog/product/c/h/chase-wind-black.jpg The bow has two length types of bolts 17" and 20".

    tubis
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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Sat Apr 27, 2013 12:46 pm

    The power stroke is 11.2" from the specs. The brace height seems to bee half that from the picture i made Thats a total draw lenght of 11.2"+5.6"=16.8" ....so rounding off to 17"
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    Re: Distance from limb/prodholder to string latch?

    Post by Hotspur on Sat Apr 27, 2013 1:12 pm

    Looks well thought out. I would like to see some pictures of your project!

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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Tue Apr 30, 2013 12:19 pm

    Hotspur wrote:Looks well thought out. I would like to see some pictures of your project!
    Well, maybe i do i tread whene im finished. But heres some previews.
    Had i friend do som ruff milling on the riser

    Im gona take away lots and lots of more material of this thoe and gona do a black anodize.
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    Re: Distance from limb/prodholder to string latch?

    Post by Hotspur on Tue Apr 30, 2013 12:56 pm

    Thanks for the pics. I think many will be interested in seeing your progress.


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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Mon Aug 26, 2013 3:27 pm

    Something is wrong. Either i have the wrong limbs or the wrong string. With this string the brace height and powerstroke became 50/50. When i made my own string a little bit longer it was spot on. The original string was 70cm and. I had to put on a 85centimters string to get the correct powertsroke.
    I have mailed the seller. Im pretty shure thought that i have the chase star limbs and not the chase winds.
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    Re: Distance from limb/prodholder to string latch?

    Post by tnetcenter on Mon Aug 26, 2013 8:20 pm

    Based on the nock to nock length you used earlier (36.5")  you should brace it at 4" (3 inches per 3 ft + 1 inch) the power stroke if you have the Chase Star limbs would be 14.9 inches.   That would be 4" brace + 14.9" power stroke = 18.9" prod to cocked length @175 lb.

    Can't wait to see the finished unit!  Smile 

    Jeff
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    tubis
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    Re: Distance from limb/prodholder to string latch?

    Post by tubis on Thu Aug 29, 2013 12:17 pm

    Merlin arhery replied: "Sounds like the strings are incorrect as they should be 30" in length so yours are short by a couple of inches if you want to return them we can swap them for ones....."

    But thats till to short to get the 11.2" powerstroke. I need a string of 33". I I really believe I got the wrong limbs so I mailed them back, waiting for answer.

    To convert to "chase star" i have to make a new stock that is longer.

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