pamf wrote:is it better to work with a kayak that requires perfection (but can lead to demoralisation), or a kayak that allows less-than-perfection but you can actually roll consistently (and makes you happy)?
Do both!
I started my learning to roll in a Perception Arc, but I was a bit too big for it. Then I got a Dagger Approach, which unfortunately has the seat in a set position (too high for me) and rolling it was much much harder, I had about 10% success - it had to be perfect. I fitted 7kg of ballast in it, which helped a lot. It enabled me to have a roll that worked most of the time. As time progressed, I did a number of things which allowed me to remove most of the ballast, the major ones being:
1) Adding hip padding such that my bum could hardly move as I reached over to set up, and embellishing the padding around my thighs and knees for better contact. Finally, making sure the backband is tight enough.
2) Watching the "problems" section in Performance Video's "The Kayak Roll" DVD, it mentioned body rotation which I wasn't doing - applying body rotation caused me to do less work with my arms, and also guarantees that I'm looking sideways at the end of the roll.
3) When doing hip-flick practise, going from facing-up underwater, to facing-down above water, to reinforce the body rotation in (2).
4) If "nearly making it", dinking my head towards the water - it engages the correct knee.
5) Working on body rotation above water, exercises to be able to get the body to turn as much as possible - thus ensuring that I could get my body at 90 degrees to the boat during set up. Plus, getting my head as close to the surface as possible during set up.
Since then I got a Jackson SuperFun, and found it much much easier to roll, and has allowed me to work on combining the sculling high brace with a roll - sculling with the head on water, then flicking the boat on top. The paddle dives, but keep sculling and feathering upwards, after a couple of strokes, hip flick back, then keep sculling upwards and getting the body out of the water. Since doing that, I've found myself finishing a normal roll with a bit of sculling.
I still practice in the Approach, to avoid becoming complacent in the boat that's easier to roll. So I'd suggest doing both the easier and the harder - use the easier boat to develop new technique, the harder one to safisty yourself that the technique is consistently good.