true i am not arguing that if you set everything consistently it will not be more realistic, just that these settings provide an easy realistic solution.  the problem with setting everything realisticly is that you have to take realworld size into acount.  the settings i have provided conduct a realistic simulation for the art hobbiest which is fairly consistent throught the realworld sizes i have tried and other settings i have tried.  however if you are a physics major, i would not recomend my tutorial for the settings, just for setting up the simulation. a physics major might want to calculate the settings himself