at impact is indeed open ( closed ) and is not the face angle
opening (closing) due to gear effect of a toe ( heel)
strike as I believe these units derive these values
after impact ?
Thanks for your help/insights
It doesn't assume that, no. It knows it can go down to even 60%, and they've verified with super-high-speed cameras. 85% is the average with a driver.
In use, if you've spent 10 minutes with a Trackman or Flightscope and understand the basic physics of it all, this doesn't present even a small problem. You can throw away the really bad mishits (which you do anyway), and the minor ones are almost smack-you-upside-the-head obvious.
You don't need to keep hitting carriage returns when you type.