Helicopter=balance.. The deeper you learn the balance of the rotor head.. the more predictable you can make it.. period.. Balance is essential to anything that relies on centrifugal force. if its out of balance.. "reguardless of its axis" its not performing to its optimum..Balancing the center of gravity is an " optimum" option.. it allows you to loosen the grips on the blades. Which in turn makes the head more effecient.. for when ya need it.. BAD. ..