The rudder of an aircraft is shown where the rudder rotates about line OBA. The force F...

The rudder of an aircraft is shown where the rudder rotates about line OBA. The force F at point C acts in the -x direction. The distance between points O and B is 1.8m and the distance between points B and C is 0.6 m.

When α = 15°, the position vector from point B to C has the x, y, and z direction cosines 0.2588, 0.9077, and -0.3304, respectively, and F = 0.8 kN. Determine the moment of F about line OBA.