System to clear a trapped keel on a grounded boat has a high pressure line to direct water at the surrounding sand/shingle to release the keel and allow the boat to float clear

摘要

The system to clear a grounded keel (3), at a boat with the keel (3) fixed to the hull (2), has a high pressure line (5) from the hull (2) to the base (4) of the keel with at least one jet (6) at the outlet. The upper end of the pressure line (5) is attached to a pressure pump (7) which forces water under pressure to the lower jet (6).