On what planet are kayaks wider than canoes?
I own and paddle both canoes and a variety of touring and whitewater kayaks so I have a pretty good familiarity with both craft. The majority of the former are always far wider than the majority of the latter. And longer kayaks do NOT "require a rudder" to turn -- the rudder is to improve straight tracking in wind or in following seas. Rudders are not intended to be used as a tiller. Kayaks are turned by a combination of paddling and leaning to change the waterline.
The hull profiles of most of my kayaks are a modified vee or a multifaceted hard chine, not "flat" or "rounded". That's true of most touring and sea kayaks.
I'm sorry, but with all due respect for your love of physics, you are off base in your comments on kayak design and performance characteristics. SINKS shed wind better than a canoe both due to riding lower and due to the laminar flow over the curved solid deck.
Hardshell Kayak Sail Rigs
Touring Kayak Paddles
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