When an aircraft designer is faced with the problem of tailoring control surface hinge moments as well as the effectiveness of and force required to operate those surfaces, she or he has several available design tools. Two of the most effective are types of aerodynamic balances—the horn and the external-airfoil balance.
This is a companion discussion topic for the original entry at https://www.avweb.com/flight-safety/control-surface-design-keeping-them-balanced