Attached Link: http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=447623

ISTR this was asked before. however, animating them is non-trivial IMVHO. they spread out from the boat, they decay with distance, their angle varies with speed, they interact with wind-created waves et al. in the old days, some folks useta believe that the "bow wave" determined the maximum speed of the ship.