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Author Topic: PYRAMID BOW FINISHED!!!!! (Full draw picture)  (Read 25285 times)

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Offline CORIUS

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PYRAMID BOW FINISHED!!!!! (Full draw picture)
« on: May 11, 2013, 10:43:09 am »
This is going to be the  3rd bow ive made. Im trying to get 60# at 30". The bow is 62" ttt with a 7" handle. Ill continue to post my progress and hopefully some fellow bowyers on here can help me along the way.
« Last Edit: May 22, 2013, 09:14:26 pm by CORIUS »
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Offline bushboy

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #1 on: May 11, 2013, 10:57:21 am »
That's asking quite a bit from r/o @ the lenght your going @! 2x your draw plus 6 is the norm in most cases.I would make it bend in the handle to help share the stress,but that's just one opinion.
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Offline swimbill

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #2 on: May 11, 2013, 11:01:01 am »
That seems to be very short for a 30" draw, you will be stressing those limbs to the max.  Typically for a 30" draw you would make the bow 70-71" long ntn. You are looking for a 60# bow that is about 60" ntn could be done but your tiller will need to be spot on. IMO
Swimbill
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Offline CORIUS

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #3 on: May 11, 2013, 01:05:51 pm »
Its going to have a backing on it. Will that allow the bow to be pulled 30" without too much stress? What if i made it a 28" draw?
« Last Edit: May 11, 2013, 01:11:08 pm by CORIUS »
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Offline Josh B

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #4 on: May 11, 2013, 01:14:11 pm »
Unless the backing is hide glue and sinew, probably not.  The belly is gonna crush out whether its backed or not.  You've cut the handle narrow enough that a bendy handle is not gonna be a viable option either.  My best advice for you is to finish this one out to 26" maybe 27" and start another longer one for your thirty inch draw.  Josh
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Offline Ifrit617

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #5 on: May 11, 2013, 01:14:28 pm »
It will be overstressed even with a proper tiller. For red oak, I would go 64" n2n with an 8" stiff handle if your looking for a 28" draw. 30" I would go 70" especially since its your third bow.

Jon
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Offline CORIUS

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #6 on: May 11, 2013, 02:12:16 pm »
Thanks for the advice! I will probably go for 27" then. Ill continue to post my progress.
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Offline JW_Halverson

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #7 on: May 11, 2013, 04:11:09 pm »
Here's some good rules of thumb to help calculate your bow length.

1) Bendy handle bows with circular tiller:  Minimum nock to nock will be double the draw length.
2) Stiff handled bows with eliptical tiller:   Minimum nock to nock will be double the draw length plus 10%.  That includes a 4 inch handle and 1.5 inch fade outs/7" non bending wood.
3) Stiff handled bows with elliptical tiller (alternate technique): Minimum nock to nock will be double your draw length plus 7" for the handle section.

Remember, those are minimums.  If your tillering is excellent, you will make great bows at these lengths.  But if your tiller is not all but perfect, the lack of leeway will make the problems worse.  A little hinge on a longer bow has less effect then one that is pushing the limits of it's capacity.   

Get after it now!  Post pics as you go!
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Offline CORIUS

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #8 on: May 11, 2013, 06:37:34 pm »
Including the fades, there will be 7" of nonbending wood (handle area) that leaves 27.5" of working limb on each side. Does that mean i can pull the bow 27"? Also the bow will be backed with wood glue and linen and have a string made from 14 strands artificial sinew. What if i was to go for 50# instead? Would that give the bow a fighting chance?
« Last Edit: May 12, 2013, 02:41:25 pm by CORIUS »
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Offline JW_Halverson

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #9 on: May 12, 2013, 05:38:31 pm »
It will be a close race, but if your tiller is good you will have a fighting chance.

As for arti-sinew, it's one of the last choices I would make for a bowstring. Only a bit better than rubber band.  Send me a private message and I will make you a Dacron B-50 bowstring for it.
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Offline CORIUS

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #10 on: May 12, 2013, 06:19:01 pm »
Hows the tiller look so far? To me both limbs are too stiff and the left limb needs to be lessened to match the right limb.
« Last Edit: May 12, 2013, 06:35:48 pm by CORIUS »
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Offline CORIUS

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #11 on: May 12, 2013, 06:22:20 pm »
What makes artificial sinew a bad option for a string? It seems pretty strong.
« Last Edit: May 12, 2013, 06:25:29 pm by CORIUS »
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Offline JW_Halverson

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #12 on: May 12, 2013, 06:29:54 pm »
Strong is not the problem.  It's as stretchy as a bungee.  It actually wastes energy and robs your arrow of speed. 
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Offline CORIUS

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #13 on: May 12, 2013, 06:34:16 pm »
i gotcha. thanks for the offer to make me a string but would like to try it  myself. going to order me some dacron right now.
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Offline Slackbunny

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Re: RED OAK PYRAMID BOW IN THE WORKS!!!!!!
« Reply #14 on: May 12, 2013, 06:39:01 pm »
Quote from: CORIUS on May 12, 2013, 06:34:16 pm
i gotcha. thanks for the offer to make me a string but would like to try it  myself. going to order me some dacron right now.

That's the spirit! Making strings isn't hard and its much quicker and cheaper to make your own rather than outsourcing. There are some good videos on youtube about how to make them. I prefer flemish twist, but many others like endless loop strings. Either make a fine string.
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