I wouldn't choose to paddle my Canadian canoe "in company" with kayaks or sots etc, because
those craft are invariably
much easier to paddle and therefore significantly faster than, a Canadian canoe. This inevitably leads to either the canoeists wearing themselves out, trying to keep up with the kayakers
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Agree with you on the lack of definition of kayaking/canoeing to the general public, I continually get asked what the difference is. However, for those of us in the know, I'm not entirely sure that kayaks are much easier to paddle than canoes. Not once you get the hang of the J stroke in the open boat, which is a basic required stroke for solo paddling, same as knowing how to use a kayak paddle to propel the boat is a basic requirement in a kayak. So once you know the basic method of propelling the canoe or kayak, you have then entered into the beginner category, it's at that point that skill varies from person to person, and that accounts for canoes and kayaks. Although, a kayak is faster, but that is an inherent design of the craft, it doesn't make it any easier to paddle, it's just faster...
If we are comparing like for like, paddling on flatwater for instance, I would go as far as to say that paddling a canoe is easier given the fact an open boat is typically 10 inches wider than a touring kayak meaning the stability of a canoe is going to be greater than that of a kayak (obviously you can get tippy canoes or kayaks though, but you would need to consider the particular design as a fair comparison).
And on the double blade/single blade debate, I believe the reason for having a double kayak blade as opposed to a single canoe blade is down to two factors, a double blade paddle is faster than a single blade and the double blade suits the ergonomics of the paddling style of the kayak. Same as a single blade suits the upright paddling position of the canoe, a double blade in a canoe just doesn't really suit the design/ergonomics. The remarks that 'anyone can do that with two blades', 'a single blade takes more skill than a double blade' and 'canoeing is the purist form of paddling' that are often heard amongst the elitist canoeist fraternity just aren't correct.
First and foremost, you only have one blade in the water at a time, regardless of it being a canoe paddle or kayak paddle, unless your paddling tandem in a canoe, and then you can literally have two blades in the water at the same time, so if two blades is an alleged advantage, then the canoe is the one with the advantage, not the kayak
Paddling skill can vary from paddler to paddler, but I don't believe for one minute that canoeing takes more skill than kayaking, as you can make your manoeuvres as simple or as complicated as you like, of which the requirement for varying skill levels is required, be it in a canoe or kayak. (not entirely sure why canoeists think that paddling a kayak doesn't consist of various complex paddling strokes/braces, just the same as the canoe also has it's fair share of strokes/braces etc). Only difference being that with a kayak, the boundaries are different as a kayak is designed to take on a much higher grade of water than a canoe. After all, that was the original intention of the design. (also note the translation of a kayak is 'Man's boat!)
And as for canoeing being the purist form of paddling, Just because one craft was around before the other doesn't make it better, not given the fact that evolution is constant on this planet, and a kayak is simply a perfect example of evolution; Able to take on extreme waters and at a higher speed when required (although the load carrying has been sacrificed, doh! but still sufficient to sort long expeditions). Without evolution we wouldn't be reading this now, we would be too busy throwing rocks at each other and crapping in the woods (although, not everyone has evolved! and dependant on locality, this is still a normality).
Just thought I would back up the kayaking sport a tad, not that I think kayaking is better than canoeing or vice versa, they are both great. Just pointing out that kayaking is most certainly not a simpleton's sport and the skill level required depends on the type of water you intend to paddle, pretty much the same as with a canoe
Steve