Sustaining the line of compression
- Thread starter mandrin
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The former clubhead either has more "effective mass" (shaft made stiffer or felt heavier and sustained that way) or is still accelerating (positive thrust v.s. zero or negative) into impact or both, so that not only it's got decelerated less (higher separation speed), but the ball also got bounced more (less reactive force loose or cushion).
BTW, the golfer actually has that kind of "influence" way way ahead of the impact interval. In other words, it's the result of an "intention" planed/programmed before execution. For jumping over a ditch, I'm not sure people can do anything about it while being in the air.
These figures are posted by the labs and aren't based on just one swing, but an average. It isn't a contest for number bragging rights either. The players want the truth so the equipment can be matched to the swing.
The "smash factor" is just the ball speed divided by the head speed and doesn't account for anything. But the fact that Bubba's smash factor is bigger than Hank's is a good indicator that the golfer does more than just generate clubhead speed at impact.
You are correct, that's how the smash factor is computed, but ball speed is affected by the location where the ball is struck on the clubface. Here's a quote from the Zelocity launch monitor site.
"Power Transfer Ratio % is calculated as Ball Velocity / Club Speed x 100%. This represents an indication of centeredness of impact between the ball and club face. An exception to this rule is the thin or topped shot which may show a high ratio even though off-center impact was made."
PTR readings will also vary depending on the angle of the face at impact. Even a small difference in face angle will affect the readings.
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