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 as described in the previous paragraph -- with proper putter design, moment of inertia, high or low, does not even 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?
WAs the impact face of a golf putter makes contact with the ball, momentum from the putter is transferred to the ball and that causes it to be launched toward the cup. But a few things can happen at the instant of impact that can hinder intended launch
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. In other words a properly designed golf putter needs to be center shafted, and one putter on the market today is -- the new technology Quantum Symmetric Golf Putter.
Many golf putter designers who know little or nothing about physics, believe that padding the impact area will somehow reduce annoying shaft vibration. But what padding actually does is dampen impact so less reverberation is felt, But this has no effect on shaft vibration, Of course if impact is dampened this must be overcome with a stronger stroke, but that results in more reverberation, so the net effect is trading one bad result for another. The only way to eliminate annoying shaft vibration is with perfect polar symmetry -- perfectly straight shaft vectored precisely into the Center of Mass of the Head.
Many golf putter designers have embodied texturing on the impact area, claiming that it somehow improves ball launch. But what texturing really does is bite into the ball surface which slightly increases impact dwell ,and results in slightly increased ball skid at launch. It is not enough to worry about, but it does no good either. And the same can be said of pads.
But the insidious thing about pad/texture inserts is that the effect ball launch wne way when impact is on the insert and entirely differently when the impact is at the margin of the insert, This introduces detrimental uncertainty into the putting process and that is obviously detrimental to precision putting performance. The Quantum Golf Putter suffers none of that because its imp0act face is smooth and hard, and that is another reason why it is superior to old blades and mallets.
NEW SYMMETRIC TECHNOLOGY GOLF PUTTER BY QUANTUM - IMPACT BENEFITS
Shaft vibration upon impact is annoying; but by the time you feel it, the ball is long gone on its way toward the cup, so it is really not factor in putting precision. But being annoyed does have a detrimental effect on well-being and therefore your overall performance. So, for that reason we should try to solve the problem. When a physicist analyzes an impacting tool, he sees a grip, a power vector, and a business end. Whenever the business end impacts an object, the impact will felt up the power vector to the grip; but the power vector would have no cause to vibrate. Only if the actual shaft is not coincident with the virtual power vector, would there be cause for vibration. So now that we know the cause of shaft vibration, the cure becomes obvious. The actual shaft must be made coincident with the virtual power vector; in other words, it must be perfectly straight and vector precisely into the center of mass of the head, One golf putter on the market today, suffers no vibration problem because it is perfectly shafted -- the Quantum Golf Putter.
It is comical when golf putter designers who know little about the physics of "moment of inertia" try to convince you that "moment of inertia" will solve their impact twist problems. All you need to know about "moment of inertia" is that it is the trait of a physical object which resists change in the object's rotation; but resisting is not eliminating; and to help precision putting performance we need to eliminate impact twist entirely. Polar Symmetry eliminates Impact Twist entirely, and that is what make the Quantum Symmetric Golf Putter superior to Blades or Mallets.
iImpact Vibration does happens after impact so it really has nothing to do with putting precision, but it is annoying and that is detrimental to your enjoyment of the game.
We could explain impact vibration, but physics is not the favorite subject of most golfers, so the best way to convey the concept of annoying shaft vibration is by analogy. Would you play baseball with a bat looked like this; then why would you play golf with a putter that looked like that? Or would you play pool with a cue that looked like this; then why would you play golf with a putter that looked like that?