bow stacking

[Chub]

i read on another post and the person thought there bow might be stacking .i would like to know and understand what staking is?  

[Dano]

In a selfbow, the closer the string angle at the tips gets to 90 degrees the more a bow will stack. In a laminated bow there are more reasons, mostly design and string angle. We'll see what the glass bow guys think.

[Shaun]

Stacking is when the draw weight per inch suddenly increases. It feels like you "hit the wall" as you are drawing. Most bows add 2 or 3 pounds for each inch drawn, when this jumps to 5 or 8 pounds per inch you feel it as stacking.

[Ricker]

Hi Chub,
I took the definition out of Traditional Bowyer's Bible Vol 4

Stack: Abrupt increase in draw weight during later inches of draw.  Caused chiefly by large differences in string angle at early and later stages of draw.  Especially noticed in short bows.

If you put your bow on a scale and carefully draw it inch by inch writing down the weight until full draw is reached usually you can see a specific trend of the bow gaining an equal amount such as 3 pounds an inch for example.  When it starts to stack it will jump up to read a higher amount in one inch, such as 4 pounds.  That is where that bow starts stacking.  I personally don't like to repeatedly draw a bow into it's stacking  draw length, it is trying to tell you it is getting over stressed.
So, if it is smooth/even out to 27" but at 28" it jumps up a bit, I feel it is a 27" max draw bow.

Hope this helps you.

[Jeremy]

Dano has it right.  Stacking (defined as where the bow starts to pick up more weight per inch of draw) starts as the string angle at the bow tips approaches 90 degrees.

It's easy to see where a bow starts to stack in a f/d curve, but a little harder to explain.