Stacking

[mikekeswick]

Look at the bigger picture.
Angle in the string where you pull from and the angle at the tips are both important factors.

[Del the cat]

Here's my hypothetical bow.
Its drawn perfectly symmetrically except one limb is shaped slightly differently over the last few inches, but the nock position at brace and full draw is identical (btw it shoots real smooth ).
Is the string angle actually any different for each limb assuming the limbs flex over the same length?
Is the string angle the actual tip angle or the angle from string to a point midway down the limb?
Note the angle of string at the fingers is the same either side (assuming bow held dead centre, arrow shoots from dead centre for simplicity)
Del

[blackhawk]

@Del....ya gotta  huge hinge on the left limb of your bow. 

[George Tsoukalas]

"Is the string angle the actual tip angle or the angle from string to a point midway down the limb?"

Tip angle.

Jawge

[PatM]

Del, you can see that you can't draw an ellipse and put a recurve on one side. The  increased bend on the recurved side would change the whole limb. That's why you had to throw the hinge in there to get everything lined up

[DC]

So in Del's picture the right limb would stack before the left?

[Del the cat]

OK...
So if we now assume both limbs are totally static for the last section (up to and including the hinge) as shown in the new pic'.
They both now have identical 'working limb' length.
Does the silly shaped lever behave any different to the slightly deflexed shaped lever?
Is the actual string angles the same on each?

I'm playing Devil's advocate to some extent here... As PatM points out if I add the recurve without the hinge (dotted line) I'm increasing string length, which changes the geometry . I'm just striving for better understanding of cause and effect really.
Del

[George Tsoukalas]

"So in Del's picture the right limb would stack before the left?"
Correct.

All bows stack potentially, Del, the limb on the right would, way before the one on the left.

You lost me on the rest of your last post LOL. Spent a good part of the day in 90 deg F temps.

Jawge

[jeffp51]

I think stack is really just simple geometry.  the tip moves in an arc--and has a backward component and a downward component. Only the backward component results in forward arrow movement.  After 90 degrees, the percentage of downward motion is greater than the backward motion and stack begins to limit how much further the bow can be drawn.  Since our draw is only backward, you reach a point when it is no longer possible to to draw.  on an infinitely bendable limb, that would be when the tips point straight back.  recurved tips delay that point.

[George Tsoukalas]

Yup.
Geometry. 90 degrees is the magic number. When the string angle gets there, that's it for drawing the bow.
Jawge