Plane Surfaces

If the plane area is symmetrical about the vertical axis OG, then 0 d = . We will assume that this is normally the case.

Find Resultant Force:

Vertical Point Where Resultant Acts:

The resultant force acts perpendicular to the plane and so makes an angle 90° −φ to the horizontal. It also acts through point C, the centre of pressure, a distance D below the free surface. To determine the location of this point we know

Plane Surface Properties