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. )
All yardages made on tournament greens, Different green speeds and wedges coming soon (mk.iii)
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.