Originally Posted by boogielicious
It is sad that she took her own life though. She obviously had a good mind for engineering.
You do realize she was talking out of her butt on the whole "zero moment of inertia" stuff, right?
I = mr^2
Your moment of inertia is equal to your mass time the square of the distance to your rotational axis on a perpendicular line. This means that, technically, any club can have zero moi if you hit it perfectly in the sweet spot (in other words there is effectively zero distance between your contact and the rotational axis). All you have to do is hit the ball on the rotational axis of the club.
More importantly, this means that the only way for you to create a club with zero moi across the entire face is to either have a face that is 0 units wide or a mass of 0, both being a physical impossibility. My thinking on this is that she meant 0 moi in the center of the clubface, which really just means that the club appears to be face balanced (since it would mean your axis of rotation is also located directly on the sweet spot of the club). She was just blinding people who already didn't know what they were talking about by giving them differently phrased buzzwords with long and complicated explanations behind them.
Long story short, face-balanced putters should behave with a MOI of 0 (the same as this Yar putter) if you strike them in the sweet spot. Any putter will behave as if it has zero MOI provided that you strike the ball on its axis of rotation perfectly. Unless this happens or your putter has a mass of 0, you will never have a zero MOI club. At least, this is the way that I understand it from my physics class that I'm in.