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Digging deeper... you can use the frequency of the woosh also.  It is possible to measure the speed of an object using the noise it generates when passing through a decibel reader,  but with some limitations and considerations. The method relies on the relationship between the frequency of the sound emitted by the moving object and its speed.  When an object moves at a constant speed, it generates sound with a characteristic frequency, known as the "Doppler frequency." The frequency of the sound emitted by the object can be related to its speed using the formula: f = (v / c) * f0 where: - f: frequency of the emitted sound - v: object speed - 😄 speed of sound (approximately 343 m/s in air at standard temperature and pressure) - f0: frequency of the sound emitted when the object is at rest Having "C" been constant, and "f0" been unknown but equal for both swings you only need to compare the frequency of  each swing to know how much faster or slower is a swing over the other.  

As I told you before, the sound attenuation is 3 db at 1 meter (38").  At 7" (your example) is a wooping 1 db less, for an 80db 7 iron is under 1% error. I know for sure that my PRGR is not that accurate, even my skytrak isn't that accurate. For a FREE unit seams to be promising if you can't afford a speed meter.   Again, you are swinging in the same spot, over and over again in the same session. Phone position is the same , background sound is the same, environment is the same. The only difference is the peak sound you produce when you whoosh the club.     You need to do a lot better to discharge an idea.     

Wordle 1,194 5/6 🟨⬜⬜⬜⬜ ⬜🟨🟨⬜⬜ 🟨🟨🟨🟨⬜ ⬜🟩🟩🟩🟩 🟩🟩🟩🟩🟩

I'm not real familiar with Raynor, so I looked at the Golf Club Atlas article.  It was interesting to see Dye essentially copy an "old" design, but I imagine that almost all current designs are based at least partly on the work that has come before.  

Dave, it's a Raynor. C'mon now… 😉