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  Another view
  Posted by: Kocho on Apr-15-13 12:09 PM (EST)
 

In moving water and white water, a boat with harder chines and flatter bottom will feel loose on the water compared to a boat with similar displacement and other parameters. And I'm not talking strictly whitewater boats. For instance, the P&H Delphin is flat bottomed and rather hard chined and sharp edges in the front and rear, with hard chine with rounded edge near the seat (kind of opposite to other hard chined sea a kayaks, which seem to have sharp edge near the cockpit and soft edge fore and aft). That boat, as long as you do not edge it, is very unaffected by cross currents, compared to a rounded bottom with a V like the Zephyr. The Delphin will go where you want during eddy out maneuvers where you don't edge it, while the Zephyr will be swept downstream. The current just slides under that flat bottom. But if you want your edge to grab and for you to peel out and turn downriver, edge it and it will do what the Zephyr does.

For white water creek and river runners, the same holds true - keep them flat and they are maneuverable. Give them and edge and they will grab the current or track where you want them, for instance during a cross ferry: you eddy out with little or no edge to keep the boat pointed where you want it while you enter the main current, then give it some edge so that it acts as a keel and the boat tracks. Reverse for eddy out maneuvers - edge it at the eddy ,one so the rails catch and you swing inside the eddy for a tight turn by the current (front half of boat digs into the water in the eddy and the rear digs on tue main current, so the boat turns around by it) as opposed to going over and continuing straight into shore/rock.

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