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Weight Balance chart design mystery aka "attractive waist" ;-)

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Joined
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Greetings, any hint why the Piper (e.g 161 Warrior III) Weight Balance chart is "thinner" (blue lines) in the lower part?
I wonder why the lines are not simply going straight down (e.g. marked red)
 

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A lot of W&B graphs are skewed. Reason unknown. Probably just to make you ask.
 
Usually it is plotted that way so that the line joining full fuel, intermediate points, and empty, is a straight line -- or something related.

Created for and when folks actually used paper charts, and not gizmos, to ease the figuring.

* Orest
 
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hmmm... still difficult to grasp.

purple = empty aircraft with max fuel
red = empty tanks

soooo...the "narrowing lines" are more confusing than helpful for me 🥶
 

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hmmm... still difficult to grasp.

purple = empty aircraft with max fuel
red = empty tanks

soooo...the "narrowing lines" are more confusing than helpful for me 🥶
Not an explanation; just another observation.
In the chart posted above, there are no exactly VERTICAL lines shown and thus the slope of the almost vertical lines is useless data. Without some description for these sloping lines (obviously from outside sources) this chart could just as easily have been drawn with the existing lines perfectly vertical and would convey the same information.
DJ
 
Seems like the horizontal width of the plot is proportional to the weight at that level, at least for the charts attached so far. If you do a quick measurement with a ruler, including above 1950# if you extrapolate the 83" max forward CG line, seems like it matches pretty closely. Maybe that's good for something?
 

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