Primitive Archer
Main Discussion Area => Bows => Topic started by: JoJoDapyro on January 15, 2015, 07:47:45 pm
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What feature in bow design causes stacking?
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"Features".
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;D indeed. Features. I'm still new enough to admit it >:D
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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
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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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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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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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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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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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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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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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Even if a bow is stacking it still has to be bending if the string is moving. You're just losing mechanical advantage.