On Fri, 06 Jul 2007 13:46:32 -0700, frank wrote: >But more air is pushed forward >and less pulled back for every complete cycle. Frank as Martin's "malot" device is a centrifugal fan it will deliver air in one direction only which ever way it is rotated, the blast will be in pulses as the direction of rotation changes when the bow gets to the end of its travel. AJH