From my isolated point of view, no there is not. If you were talking about “true” straight wood longbows, while still not perhaps reduceable to a mathematical formula, it mostly comes down to “the 90-degree rule.” To wit: the closer the string/limb tip angle comes to 90 degrees, the lower gain in poundage/speed you get for every inch drawn and the higher the stack. So, the shorter the ratio between bow length and draw length, the more the stack. But when you crank in recurves and deflect-reflex technology, plus glass, carbon, etc., it all becomes so very specific to a particular bow design that I can’t imagine any one formula for all. My self-made osage bows at 60″ and 55# stack like a brick wall. My 54″ r/d Shrews at #55 pull smooth as warm butter, to the last centimeter. I trust that adds to your usual and well-known confusion on all issues (I mean, just ask your wife!). :P:lol::P Anon

I know if I had a 65# bow like that, it would stack….

It would be stacked on top of all the other gear I don’t use. 😆

I don’t enjoy shooting any bow over 55#. I can do it, but I don’t like it.

It seems for me that there is some optimum bow weight. If it is less than 50 lbs, I don’t shoot as well and it just doesn’t feel right. If it’s over 55 lbs, I can’t shoot it as well out of a tree and I don’t practice with it as much.

I think the real question here is, how many new bows does that make this year, Patrick? You lucky dog….

Patrick,

The point at which stacking (the rapid increase in draw weight) begins is based on the design of the bow. So, a 50# bow will start to stack at the same point in the draw of a 65# bow of the same design. It’s all about how the limbs work.

Now, the heavier bow will feel like it is stacking more but that is because you started out with more weight; if every extra inch adds 5% more than the previous inch then the amount of increase will be more per inch on a 65# bow than on a 50# bow.

So, the limb length does not necessarily affect when a bow will start to stack.

Snakeeater