This is just a rough hint how irons will react, its a guide i use to calculate shots, but remember, every hole has its unique approach (i.e bethpage #1 plays longer), a 7 iron which rolls to 170+ yards on one hole might only roll to165 on another! This is where course knowledge comes into the game, and can only be learnt by yourselves by playing those courses. )
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All yardages made on tournament greens, Different green speeds and wedges coming soon (mk.iii)
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Due to the discussion with spin, No spin is DOT DEAD IN CENTRE OF BALL (hence no spin, there's no "top" or "back spin" added) 3/4 spin is 3/4 way down the ball- between middle of ball and bottom.
There could be 5 yards difference between dot a fraction more down or more up so thats why its roughly the ball flight, if you see ball coming up a touch long or short you can pull the dot down, or up next time you execute that shot.