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Kayak and Canoe Design Bulletin Board
Re: Design Water Line-My 2 Cents
Posted By: Mike Scarborough In Response To: Re: Design Water Line *LINK* (Capn Jimbo)
Date: Wednesday, 17 January 2007, at 1:53 p.m.
I'm assuming that KAPER uses the DWL as the actual waterline in its calculations. To compare drag between 2 kayaks it's important to eliminate other variables that affect drag, so that the comparison reflects just the hull differences. The actual waterline length relates to drag caused by the bow and stern waves. Displacement is important because, at a greater displacement, every boat has more wetter surface area which is another source of drag.
So if I calculated the total drag of the same kayak with a 100 pound paddler and with a 200 pound paddler, I might find that with the heavier paddler there was more displacement and more drag due to the larger wetted surface area. But I might also find that, as speed increased, the drag caused by bow and stern waves was a greater penalty to the lighter paddler with a shorter actual waterline length.
Mike Scarborough
Friendship Kayak
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