I think a second block is necessary with my Sport, around an arm's length from the seat. (I already have a small block at the stern carry handle bracket). I just purchased a Ronstan Series 40 RT Orbit Block (RF46101) that has a one-way ratchet effect under load. I am travelling at the moment so I haven't tried it out yet. I will post about how it performs later in the week.
I thought about a cam cleat as well but the Sport reacts so fast to wind gusts that I have the distinct impression that this would lead to more swimming.
I should say that I have only been sailing my Sport for a couple of months though I have had a fair bit of experience with other boats (Hobie 14, Laser, various wind surfers). My impression so far is that the Sport is quite a nice little sailer. The main sheet and sail furler give quite a bit of control over sail size and shape. And the little beastie tacks beautifully. The ability to change apparent wind direction through peddling makes for an interesting form of hybrid sailing, especially going to wind.
In regard to capsizing, have been ditched only once so far. (Happened very fast in a 25 knot wind; the kayak seemed to trip on its nose; I *think* the paddle stowed on the side dug into the water and twisted sideways). The kayak turned turtle (mast straight down). I hadn't practised righting the kayak so there was a real 'wonder what to do' moment. I was able to clamber on top of the hull enough to reach the far rail and right the kayak. I climbed on the kayak from the stern; I don't think you can get on from the side. The main problem was climbing over the seat which raised the kayak's centre of gravity a lot. Remember thinking that I wouldn't get away with that manoeuvre in even moderate wave conditions...
I strongly recommend practising righting and getting into your kayak close to shore, especially if you are not strong and flexible of body.
Last edited by Lead Belly on Tue Mar 11, 2014 5:07 am, edited 1 time in total.