THey are stable when you get them upto speed
Only compared to how stable they are at rest.
C1 sprint boats are a whole next level of madness
Indeed – tried to learn to paddle one of those, and whilst I could manage a few km, I never really got comfortable and could never put full power in. Only really a matter of spending enough time practising I’m sure – was paddling 3 or 4 times a week when learning to paddle a racing K1, and only ever got out once a week in the C1 (and now I spend my time doing something which requires far more balance skill!)