-- Last Updated: Jul-09-13 8:45 AM EST --
I'm basing my statements on my experience and traditional design.
These are traditional Kayaks: http://patentpending.blogs.com/photos/uncategorized/capture1113200482500_pm.jpg
Notice the bottom is smooth, no "point" (keel) and almost flat.
This one has a bit of taper/keeling at the tips of the bow/stern. But, as you can see, the main part of the hull is a smooth, curve (Almost flat): http://pivot.no/wp-content/uploads/Fabrication-of-Kayak_2048x15361.jpg
Again, these are TRADITIONAL, not modern designs.
As for being Wider than canoes. Most of the Sit-On-Top kayaks (what I specified and NOT comparing them to Touring kayaks that I specified were MUCH narrower) I've shopped around for have been anywhere from 30 to 36" wide at the widest point. This puts them equal to or greater in width than most single person canoes. Even the larger Old Town canoes I paddled years ago (in scouts) were were only 29-32" wide at their widest. Now, you'll also notice that I mentioned that Canoe shapes have been evolving the last few years (20 years or so) to flatten and widen out in the center (I've seen as much as 40+" at the center on newer canoes). This is NOT TRADITIONAL design and what I've been talking about is TRADITIONAL.
For example, these Tandum kayaks are very wide when compared to a touring SinK (As Wide, if not wider than a canoe): http://www.incept.co.nz/images/sea-kayak/lords-river-tandem-sea-kayak-740.jpg
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