Wow. I've taken non-swimmers out before but they told me beforehand and I made them wear lifejackets. I can't believe the guy filled the hulls with sand. That doens't seem like the best way to go about making sure people dont flip. Also, once in my H16 we flipped it with one of the hulls totally swamped and the other one about half full and it took 4 people to do it but eventually we got it back up. Maybe in the 18 though it's different, I've never flipped one of those. I hope you didn't actually steal anyone's rudder....