The direction of this velocity is perpendicular to the line connecting G and C. This is true because at that instant, BD is rotating about the instant center C. The direction of rotation of link BD ...

U.S. Army soldiers assigned to 11th Armored Calvary Regiment, acting as the Opposing Force, engage simulated enemy targets during Decisive Action Rotation 20-04 at the National Training Center ...

The direction of this velocity is perpendicular to the line connecting G and C. This is true because at that instant, BD is rotating about the instant center C. The direction of rotation of link BD ...