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Offline JoJoDapyro

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stacking
« on: January 15, 2015, 07:47:45 pm »
What feature in bow design causes stacking?
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Offline PatM

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Re: stacking
« Reply #1 on: January 15, 2015, 07:50:08 pm »
 "Features".
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Offline JoJoDapyro

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Re: stacking
« Reply #2 on: January 15, 2015, 07:51:26 pm »
 ;D indeed. Features. I'm still new enough to admit it  >:D
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline Danzn Bar

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Re: stacking
« Reply #3 on: January 15, 2015, 07:56:59 pm »
String angle for one............the closer to 90 deg. between the string and limb at full draw the more "stacking" occurs.  That is why recurves are a smooth draw.
Hope these pictures help.... :-\
DBar
« Last Edit: January 15, 2015, 08:25:01 pm by Danzn Bar »
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Offline bushboy

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Re: stacking
« Reply #4 on: January 15, 2015, 08:01:24 pm »
High string angle,flipped tips reduce it from what I've read.starts with early draw weight and not very noticeable increased draw weight into the full draw.most folks call it a smooth draw.yes I like it!
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Offline bow101

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Re: stacking
« Reply #5 on: January 15, 2015, 11:07:31 pm »
Besides limb twisting stacking is right up there on my list things I don't like........ >:D   Great pics D-Bar and explanation.   :)
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Offline Pat B

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Re: stacking
« Reply #6 on: January 15, 2015, 11:45:53 pm »
Its all about string angle at full draw. When that angle hits 90 degrees the bow stops bending and you're pulling along the length of the limb.  Take a wood ruler or slat and hold it at one end and vertical. Now grab the other end and pull it back. The ruler will bend like a bow. Now hold it horizontal the same and pull the end straight back. No give, ie. stacking! That's pretty simple but it is the same principle. 
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Offline Badger

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Re: stacking
« Reply #7 on: January 16, 2015, 02:08:57 am »
  Too low of braced string tension from excessive set will give stacking also, if you don't have enough early draw weight it has to build up faster.
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Offline PEARL DRUMS

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Re: stacking
« Reply #8 on: January 16, 2015, 07:56:57 am »
Ive heard some folks say bows stack because they simply don't have the gas in their tank to draw it fully. That's just over-bowed and not stacking.

Pat's description is what I hold to as well. When the bend stops and the pull starts you hit the wall.
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Offline Del the cat

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Re: stacking
« Reply #9 on: January 16, 2015, 08:49:13 am »
Poor tiller, e.g whip tiller. Can cause the large string angle.
Beginners often get what I call 'square' tiller with all the bend mid limb, this gives a poor string angle and stacking.
It's one reason I like a full compass arc or circle tiller...  smooth as silk.

The other thing is sometimes people confuse stacking with simple high draw weight. I had a guy try drawing a 90 longbow... he said "you can really feel it stacking"
I said, that's you stacking not the bow!  >:D
Del
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Offline JoJoDapyro

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Re: stacking
« Reply #10 on: January 16, 2015, 09:08:45 am »
Thanks a lot gentlemen. Helps a lot. My first bow stacks badly. The comparison between 2 bows of close to the same draw weight make it clear that it is stacking, and not just a heavy draw weight. I can draw quite a bit more than what the weight is (54#), but wouldn't like it too much shooting all day. Since my handle popped, and split, I am going to do a bit of work on my first. Thanks once again for clearing up this for me. Onward and upward!
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If you always do what you always did you'll always get what you always got.
27 inch draw, right handed. Bow building and Knapping.

Offline PatM

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Re: stacking
« Reply #11 on: January 16, 2015, 09:15:58 am »
Even if a bow is stacking it still has to be bending if the string is moving. You're just losing mechanical advantage.
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