Effects
As a general rule, there is a tendency for the upper wing to contribute a greater proportion of the total lift than the lower with positive stagger, and less with negative stagger. Increase in positive stagger also tends to move the centre of lift forward on the upper wing and backward on the lower wing. When unstaggered, the centres of lift for upper and lower wings are almost coincidental.
Positive stagger is by far the most common, as this positioning of the upper wing(s) allows better visibility for the crew as well as increased aircraft longitudinal stability, aerodynamic efficiency and maximum lift.
Read more about this topic: Stagger (aviation)
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