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Kayak and Canoe Design Bulletin Board
Re: Wide sterns
Posted By: Nick Schade - Guillemot Kayaks In Response To: Re: Wide sterns (Sam McFadden)
Date: Monday, 17 June 2002, at 4:19 p.m.
: Thanks Nick,
: Wow - that’s wild!! Does the aft edge submerge? I hope you will treat us to
: more photos.At rest the aft edge is below the waterline. At low speeds the water bubbles up around the back. At speed the water sheets straight off and creates a slight rooster tail. I believe I did not make the buttocks lines aft flat enough to get a really good "planing" like action. I was trying to balance some other variables and ended up with a relatively abrupt upward curve to the bottom just before the stern.
: My concern about the tracking of a wide stern boat came from trying to keep
: the shape from looking too blunt. The extreme opposite of the transom
: stern would be a no-rocker, plumb stern where the displaced water comes
: together mostly in the vertical plane. With a transom, the displaced water
: comes together mostly in the horizontal plane. Is that related to your
: thoughts on the boat appearing longer than it actually is? I tended to
: make the slope of the buttocks shallow, resulting in lots of rocker and
: little lateral projected area aft. I also had trouble deciding how much to
: lift the lower edge of the transom above the static waterline so that in
: flat water with a stern wave and a little squatting, the boat wasn’t
: dragging the transom.Getting the balance right so you get tracking as well as a good planing section is tricky. With my choice I am not sure I gave it enough draft near the stern to really get tracking, yet I have too much to really get a good planing shape. The result may still be good, but it is a compromise.
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