When the keel is raised up on a Seal 22, does it go all the way in to the fiberglass or is some of the keel left visible outside and if so approximately how many cm in length of the keel is left outside visible? The question is posed by a prospective new owner who is concerned about the implications of grounding on a sandy beach and surmised that the boat was designed to have a flat bottom(i.e. no protrusion of the keel)for that purpose.