Lag,
As far as I can tell, the experiments were done with a mechanical “Perfy” type putting machine. I can’t find much material so far on the Pop/hit Stroke vs. a Long Fluid Paint Brush Feel Stroke. The study wasn’t done with the intent on How-to-Putt but more of focus on what happens to your ball from impact to the end of the stroke when employing a mechanical putting robot that can roll ball very accurately time after time. Then knowing this information what can you do about it in the task of estimating break/making more putts.
He does give some insights saying that the ball will start the Rolling Phase of the putt after it has lost 29% of its initial velocity. So, one might conclude that no matter how you hit it, the Rolling Phase will start at the same velocity drop off point with the same given initial velocities whether it be a pop stroke or long flowing stroke. He does acknowledge that adding top spin or backspin adds/subtracts a small amount to the overall distance. Also the initial Skid Phase stops between 10 & 20% of the length of the putt depending upon the green speed. Also you can read from the last graph that the Stimpmeter putt rolls much further than a real world putt primarily due to the lack of the Skid Phase. The final phase of the putt during the last foot or so is known as the Decay Phase where the ball has more friction on it, sits down in the grass more than the rolling phase, and gravity plays has its most influence on the path of the ball.
