1. The Problem 2. The Free Body Diagram 3. The Question I've always had trouble determining the direction of the vertical and horizontal components in FBDs for statics problems, especially for a pin. Prior to looking at the solution, I wasn't sure on almost all of the directions of the vertical and horizontal components of forces. For member GE, I was sure that the mass of the engine would be pointing down, so I could just use equations of forces and moments to fix signs for the directions of the other forces. But for member EC, I wasn't sure on the directions of any of the forces, which meant that using equations of forces and moments would be of no purpose. Is there any way to analytically determine the direction of forces in statics problems?