I keep track of the radar metrics on the PGA Tour each week, and so far this season I’ve started to see some noticeable differences in the radar data being produced by the field than I have in years past. So I decided to look at the Tour averages for each season since the Tour started to record the radar data back in 2007.
Here’s a chart showing those averages each season.
To draw an even clearer picture, here’s a comparison between this season’s radar metrics and the inaugural season in 2007.
While the club speed and ball speed have picked up, the larger differences are in the Max Height and Spin Rate metrics. The other two factors that have seen a marked change are Smash Factor and Carry Efficiency, which are calculated using the formulas below.
- Smash Factor = Ball Speed / Club Head Speed
- Carry Efficiency = Carry Distance / Club Speed
While the percentage difference between these two metrics is smaller than the other metrics, we have to remember that USGA rules have a certain allowable Smash Factor that is roughly 1.50. So there is a ceiling with regards to Smash Factor and the same goes for Carry Efficiency.
What this shows is the effect that launch monitors have had on PGA Tour swings, as well as the golf equipment industry, which has been producing metal woods that launch the ball slightly higher and with less spin in recent years. I can also conclude from the metrics that fewer players are hitting their driver with a severely downward attack angle (-4 degrees or steeper), because:
- Their launch angles are up.
- Their carry efficiency is up.
- Their max height is significantly up.
- Their spin rate is down.
According to Trackman, with all things being equal, the lower a golfer’s Spin Loft the higher the Smash Factor. Spin Loft is a measurement of a golfer’s dynamic loft, which is the amount of loft they deliver to the ball at the moment of maximum ball compression, minus a golfer’s angle of attack, as shown below.
- Spin Loft = Dynamic Loft – Attack Angle
So if Tour players are less steep with their attack angle and their dynamic loft is roughly the same, the Spin Loft has now decreased and that allows for a higher Smash Factor.
What is probably most interesting is that higher club-head speed players have resorted to more of an upward hit on the ball. In the past, the high club-speed players almost exclusively kept their launch low so they could keep the max height low and better control their drives. They would generally have a launch angle between 9 to 10 degrees with about 2,800 rpm of spin. Now, we see some of the higher club-head speed players on Tour with very high launch angles and low spin rates.
Two prime examples of this are rookies Justin Thomas and Patrick Rodgers, both of whom are 22 years old. It should be noted that Rodgers and Thomas are ranked Nos. 1 and 2 in Max Height, respectively.
Currently, Thomas ranks 73rd (out of 203 golfers) in my Driving Effectiveness ranking, while Rodgers ranks 59th. There is not a lot of data with regards to higher-speed players who produce very high launch numbers over a significant period of time, but the long hitters who are generally more effective off the tee average lower launch numbers like Bubba Watson, who currently first in Driving Effectiveness.
I suspect that eventually players like Thomas and Rodgers will bring down their attack angles a bit in order to create a lower launch, a lower max height and a higher spin rate so they can drive ball more accurately and precisely like Bubba does. But young guns like Thomas and Rodgers, as well as the Tour radar statistics as a whole, show the great influence that launch monitors are having on the best golfers in the world.