In tilting a panel, how should the rigging be arranged relative to the center of mass and the panel center?

• A. Centered over the panel center
• B. Centered over the crane hook
• C. Centered over the panel's center of mass
• D. Off-center to the left edge

Answer: (C)

The key idea is that the lifting force must pass through the panel’s center of mass to keep the lift balanced. The center of mass is the point where the panel’s weight acts, so aligning the rigging so that the lift line sits directly over that point prevents any twisting or tipping moment during tilting. If the rigging were over the crane hook or off to a side, a torque would be created around the lifting point, causing unpredictable tilt, swing, or damage. For panels that aren’t perfectly uniform, use the actual center of mass rather than a geometric center to place the rigging, so the resultant lift is through the true balance point.