Abstract: The self-watering planter has two mantles insertable into each other, forming an annular space therebetween to define a soil space inside an inner mantle and a water space in communication with the soil space for bringing the water from the water space into the soil space. A channel is formed in the annular space defined by the mantles and connected to the water space. An opening is provided in the wall of an outer mantle for supplying the water through the channel to the water space. An arm member is movable longitudinally in the channel along a guide formed in at least one of the mantles and a float member is connected to the arm member for adjusting its position depending on the amount of water in the water space. A flap is formed in the upper part of the arm member for closing the opening upon the water space being fully filled.

Abstract: A keel structure connected to the hull of a nautical vessel, such as a sailboat, is provided at least at the junction of the vessel hull and the keel with at least one channel extending substantially lengthwise of the keel for guiding the water displaced by the keel at least partially past a zone, which extends longitudinally of the hull and is aligned with the keel, without lifting it to the surface of water.