When I got my hobie it had a bob on it. When visiting a sailing club I notice nobody had one on their boats. So I asked them why. So I took it off. Went out and flipped over. It turtled and the mast got stuck in the mud. Until a boat came along I was unable to get it unstuck. Needless to say it went back on the next day.
The reason they gave not to have one is: When going over at a good clip when that bob hits the water it's going to want to stop. With the boat and mast farward motion it's going to bend the mast. Any truth to this?