It is boomless, can't limit the rotation as suggested. I know it's ment to rotate when sailing, but I didn't realise it would also rotate when not sailiing. It will be much easier to leave it on a buoy instead of taking it out and disassemble the mast everyday to cross to street (leaving it on the beach would be the third option, don't wan't any night sailor sleeping on it..). Just while I'm there anyway, and if weather conditions are ok and sailing it everyday, draining water from the hulls, etc. But you got me worried, what are the main concerns of leaving it on a buoy? Possibilty of capsizing, the action of salty water and sun? other?
Thanks