Drag

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There are many factors that go into the effect of drag in an aircraft. some would be the shape,size,velocity, inclination to flow or the conditions of the air its in.

Drag happens when the air seperates from the surface and slows down the air craft.

There is high presure at the bottom of the wings but less of pressure at the top.

The Shape

Areodynamics

The shape can realy effect the drag.  If the nose of a plane is round, it has less drag but if it was flat is would have alot of drag.

The Size

For an airplane, different sizes of different parts of the plane work better for less drag.  it depends on the total suface area, wing area and the frontal(front) area.