Radar Katana slalom water ski2020 Radar Katana Slalom Water Ski The Katana is a ski that many intermediate skiers will find to be a great ride. The reason is, it is designed to be skied at 30 mph or less. 26 to 30 mpg is a very comfortable speed for less aggressive, more of a freeride, open water skier. Most water skis are based on shapes that are intended to ski much faster. Simply making a ski wider does not make it significantly better at slower speeds. So instead, Radar