The usual estimate for carry distance based on ball speed seems to be 1.75, so 3.7 * 1.75 = 6.47. So my calculated ball speed is 171.1, which is about what I would expect and see when I get a solid connection.īut what if I had a COR of 0.87 (what the website recommends for 110-120 mph swings)? The ball speed would be 174.8, which is 3.7 mph faster. I have a Mizuno GT180 driver which has a 200g club head and I assume a USGA legal 0.83 COR (likely a little less due to tolerances), all balls are 46g nowadays (I measured a few different brands I had in my bag to be sure), and I swing about 115 mph. And here it is:īallVelocity = (clubHeadVelocity * (1 + COR)) / (1 + (ballWeight / clubHeadWeight)) There are all sorts of claims about "20-40 yards more!" but I never trust the marketing, so I set out to find the math. They had recommended COR for each swing speed because the thinner the face, the more likely a faster swing is to break it. That website made sure to note that by doing it the drivers are no longer legal in competitions or handicapping. That's when I found a website that charges ~$130 to mill the face of your existing driver to increase the COR. This started with me researching drivers and learning about the 0.83 COR max allowed by the USGA and that there are drivers you can buy that are non-conforming due to >0.83 COR.
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