K1 River Craft Attack – The Ultimate River Boat
Fenn designed the Attack specifically as a river boat. Hank McGregor has won multiple Berg River Marathons in it, and Andy Birkett has taken victories at the Dusi and Non-Stop Dusi.

The K1 River Craft Attack has also excelled in flat-water marathons, with wins at the 2011 World Marathon Championships and the 2013 U23 World Marathon Championships. It combines excellent maneuverability with a high cruising speed. The boat planes easily with minimal effort, a crucial feature for marathon racing. Paddlers can choose a higher foot-box area for extra comfort, especially those with larger feet.

On rivers, the Attack supports paddlers up to 80 kg. Its round hull runs from nose to tail, and the full tail adds volume and prevents it from sinking. This design eliminates the porpoise effect, keeps speed steady through turns, and boosts stability. For lighter paddlers, the Attack stands as the ultimate river racing boat.