Can someone explain to me why you dont just use a normal dinghy? It seems like pretty much all the issues you are trying to get around are part of what makes a Kayak work well AS a kayak, and are all things that aren't issues for normal dinghies. Is there some reason for trying to make a kayak do what something else does better?
I use both. Kayaks paddles much better, is easier to carry, and is more fun; an inflatable tender is a dependable pick-up truck and i use mine a lot. On a boat too small for davits, I would chose a kayak.
We've been bashing kayaks for their short comings. Let's list the problems with a dingy:
* Small boats generally tow them, which is bad.
* When it is time to bring them on deck, it's painful. Yeah, there are ways, but a child can drag a kayak up alone.
* Rigid dingies can be rowed, but not like a kayak, not at all.
* Dingies are a pain to carry up the beach.
* Dingies are hard to car-top.
* Dingies are clods in the marsh when compared to a kayak.
* Dingies are boring. Like power boats.
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As for security, a class is a good way to learn paddling. It is actually quite simple to learn a few brace strokes, which make capsize VERY unlikely. I have been paddling for many years, and have ONLY capsized in river whitewater.
Yes, it's an aquired taste, but like riding a bicycle, well worth learning. And nothing is so relaxing as kicking back in a kayak on the flatwater of a marsh, the only sound the hiss of the wind in the grass. The cockpit of a sailboat at anchor is a distant second.