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Mark pitted a 2020 Callaway Mavrik super-game-improvement iron against a muscleback/blade from the 1980s. He used a statistician to help, and tested a decent number of shots, though at the beginning he said about 40 with each club, so spread across three types of quality of strike, that's not a "huge" data set. Anyway, the data… Dynamic Loft: Mavrik Max: 24.6° (7-iron) Top Flight: 24.4° (6-iron) Clubhead Speed: Mavrik Max: 87.5 MPH Top Flight: 88.3 MPH Here's how Mark defined the three categories of strike: I think the results will surprise many. Carry Ball Speed: Height: The chart for spin (11:32 in) is similar to the above charts. In Launch Angle (12:22), the Mavrik Max fares a bit better than it has, but still performs no better than the blade. This reminds me of this article, which I'm fond of citing: Blades Versus Cavity Backs: A Golf Club Epiphany | SkyGolf 360
Edit: Updated data for 2013. Edit #2: Updated Data for 2017 ClSd - Clubhead Speed BlSd - Ball Speed AoA - Angle of Attack VLa - Vertical Launch Angle Spin - Spin Rate (total) MH - Maximum Height of Ball (yards) Carry - Carry (yards)
Golfers are more confused than ever for two reasons. Never before has there been so much information available to the average golfer. The "bad instructors" have as much of a platform as the "good instructors." The two kind of go hand in hand. A golfer will hear "stay behind the ball and roll your hands over to hit a draw" from one guy while he hears about how he's got to get his weight forward and follow through more like Zach Johnson from some other guy.