Cut out´s are more a rule than an exception when it comes to freerace- and slalom boards. The first thing you think about regarding cut outs is that it reduces the water resistance while planing, is that it or is it more into it?
Cut out´s – Improved speed potential and maneuverability
Cut out´s gives you the wider tails benefits of stability and early planing, and once you are planing you benefit from the narrower tails decreased water resistance. At the same time you will get improved speed potential and better maneuverability at high speeds. Cut out´s also reduces the wider windsurfing boards tendency to suck into the water.