Daniel,

No problem! I only know these things because I've put myself into these situations!

While it doesn't hurt to have a backup righting device, I weigh 170lbs and have successfully righted my 399lb F18 (with aluminum mast) by myself on three occasions using only a righting line. I have never failed to solo right my F18 with again, only the righting line. I just get the boat to spin with the wind blowing into the sails and on the top of the trampoline (about 45 degree angle to the bows is the best I can do) then with a small loop tied in the righting line, quickly hook my trapeze harness in so I lie flat (I leave the loop in it) while standing on the tip of the daggerboard. The boat righted quickly all three times. The I17 should be considerably easier with a carbon mast and less boat weight. Seriously, tip it with some people around that can help if needed and get some practice so you will feel more confident that you can right the boat.