Whitewater racing

Wildwater canoeing is a competitive discipline of canoeing in which kayaks or canoes are used to negotiate a stretch of river speedily. It is also called "Whitewater racing" or "Downriver racing" to distinguish it from whitewater slalom racing and whitewater rodeo or Freestyle competition.

The objective of the sport is to go from the starting point of the course on a river to the end point as quickly as possible. Typical wildwater venues consist of Class II - IV whitewater, in contrast to extreme racing, which takes place on more difficult streams. Match competitions generally consist of a classic and a sprint race. A classic course is 4 to 6 miles (6–10 km) in length or 10 to 35 minutes in duration, while the Sprint is between 500 and 750 meters and lasts around 2 minutes. Although there is some specialization, the vast majority of racers compete in both classic and sprint.

Competitors are placed in classes based on gender and boat type as follows:

The competitors are numbered within their class based on results from previous races and compete in reverse order (best paddler last), usually at one-minute intervals. To race successfully, paddlers must possess refined technical skill, as well as strength, endurance, aerobic capacity, and the ability to "read" whitewater.

Whitewater racing is also practiced by competing teams; each team is made by a group of three competitors belonging to the same class.

Whitewater racing started in Europe with the International Canoe Federation being formed and having the first World Championships in Switzerland in 1949. Since then, there has been a World Championships every two years. Since 2011 there is a sprint only world championships, with sprint and classic being contested every other (even) year.

The boats all have a rounded hull profile, making them fast but unstable and hard to turn. Rather than using wide sweep strokes to turn the boat, the paddler tilts the boat to one side, utilizing its curved profile to effect the turn in a manner similar to "carving a turn" in skiing. Two "wings" (flaring protrusions near the stern hull) meet the minimum width required by racing rules and add secondary stability, as well as enhancing the effect of carving a turn. When the boat is under way, most of each wing will be above the waterline so as to minimize drag. The use of kevlar, carbon fiber, and glass-reinforced plastic construction has substantially reduced the weight of wildwater boats, while improving stiffness. The top part (the deck) and the bottom (the hull) are molded separately and then bonded together using kevlar or glass cloth strips and epoxy or polyester resin. A boat can be made in 2 to 3 days, but without an oven can take weeks to cure fully.

...
Wikipedia