For example, a draw crossbow with an powerstroke can shoot a 400 grain arrow at 205 fps, while a 150-pound draw crossbow with an powerstroke can shoot a 400 grain arrow at 235 fps. This translates into a 14.6% increase in power for every 9% increase in powerstroke. Thus, if other factors are equal, a standard Han Dynasty crossbow with a ≈ draw weight and a powerstroke would have comparable levels of power to a medieval European crossbow with a draw weight and a powerstroke.