What is the power transfer ratio formula?

The power transfer ratio (PTR) is crucial in understanding how effectively a golfer translates clubhead speed into ball speed. The formula for PTR is derived from the relationship between these two speeds.

When the formula states that the power transfer ratio equals ball speed divided by clubhead speed, it highlights that PTR measures the efficiency of energy transfer from the club to the ball. A higher ratio indicates better performance, meaning that more of the speed generated by the club is effectively converted into speed for the ball. This relationship is significant in golf because maximizing ball speed from a given clubhead speed can lead to greater distances on the course.

In contrast, the other options do not accurately represent the fundamental relationship being assessed by the power transfer ratio. For instance, simply swapping the numerator and denominator, as seen in another choice, would incorrectly suggest an inverse relationship. The presence of terms like COR (Coefficient of Restitution) and COG (Center of Gravity) or introducing other factors like distance and angle of attack in the other choices further complicates the formula without capturing the essential direct relationship between ball speed and clubhead speed required for calculating the PTR.