Ball Roll Part 2

So, let’s start with the top of the previous diagram. This is an average of the parameters most OEM manufacturers use as an optimal launch model. The goal is for a clean launch with hopefully some forward rotation to the ball off the putter. The thought being the forward rotation of the ball at first impact with the ground enhances the effect of friction on the ball. The faster they can get the ball to turn over the sooner the ball starts to roll. The following is an attempt to illustrate this effect. Remember each time the ball touches the ground the rotation is accelerated by the friction of the ground against the ball.

In this model, regardless of forward rotation of the ball off the putter, with a minimal launch angle, the ball starts to roll quickly. This assumes a flat angle of attack shown by the black arrow.

The bottom model is what I hear from many instructors as a way to get the ball rolling sooner. The idea is to de-loft the putter by leaning the shaft forward, with the hope of achieving the lowest possible launch. To avoid driving the ball into the ground it is suggested that you strike the putt with a positive angle of attack. Before I get into any discussion about better or best I need to make this point. The loft of the putter at impact will have more influence on launch than the angle of attack can over come. So the following is what you get with the shaft leaned forward to negate the loft and a flat angle of attack.

Tomorrow we will continue the discussion on the pros and cons of each model. In the mean time give this some thought. what happens when I compress the ball into the turf? Does angle of attack change the launch conditions?