GOLF PUTTERS PUTTING | Blade? Mallet? Symmetric?
Moment of Inertia, is the measure of the rotational inertia of a body— the higher it is, the more the body resists change in rotation. So when applied to golf putters, "higher moment of inertia" means more resistance to head twist. In effect high moment of inertia is a good thing, but it does not solve the twist problem. The twist problem can only be solved with proper putter design -- with proper putter design, moment of inertia, high or low, does not enter the equation at all. It's use in marketing golf putters is a gimmick intended to confuse golfers into thinking that mallets have a great "forgiveness" benefit over blades.
Physics is difficult for many, so the best way to convey the concept of problematic head twist is by analogy. Would you play tennis with a racquet that looked like this? Then why would you play golf with a putter that looked like that?
Only the Quantum Golf Putter today embodies perfect polar symmetry, so it suffers absolutely no impact twist, the major cause of missed putts. So any golfer who wants to do better at putting, should toss the old asymmetric putter into the trash heap of defective design and put a Quantum Golf Putter in the bag.
When the golf putter head twists open upon impact, the result is ball launch that departs from your intended line and launched with adverse side-spin. None of this is good for precision putting, so that makes this a major problem in need of solution.
Obviously a golfer wants the golf putter to hold intended line as it impacts the ball, but if the golf putter twists open upon impact that is an impossible expectation. So we need to discover what it is that causes a golf putter to twist open upon impact. It is a principle physics that when force is applied to an object some distance offset from its point of security. the offset force (torque) will cause the object to rotate. When we apply this principle to a golf putter, ball impact is the force and the point of security is where the shaft is installed into the head. So if the shaft is installed into the head at the heel end of the head, and the ball impact force is applied to the center of the head, as is typically the case with most golf putters on the market today, the ball impact force will cause the head will rotate (twist). Of course, head twist is problematic for precision putting because it launches the ball off intended line with side-spin, So now that we know the cause of problematic impact twist. the cure becomes obvious. The point of security needs to be located at the point where the force is applied, then there will be no rotation whatsoever.
The cause of the Twist Problem is the same as the cause of the Wobble Problem -- polar asymmetry. So the cure is the same too -- polar symmetry. Polar symmetry is a principle of physics that is difficult to explain, but easy to demonstrate. In simplest of terms, polar symmetry in a golf putter requires a perfectly straight shaft that vectors precisely into the center of gravity of a perfectly symmetrical head. Prove polar symmetry by demonstration, is easy: just hold a putter by its shaft between the palms of your hands as shown, then move your palms forth and back as if you were testing the straightness of a pool cue. If the putter wobbles during this movement, it is asymmetric and will always twist upon impact.