A modified V-hull boat has a keel having a horizontal cross-sectional profile of an inverted foil. The leading edge of the keel is a sharp point and the front region of the keel tapers outward along the length of the keel until it reaches its widest point. The widest point is aligned with the center of gravity of the hull. The trailing edge is a rounded blunt edge. The aft region of the keel is substantially shorter in length than the front region of the keel.

A skeg mounts from the stern of a towing vessel and extends below the waterline. A channel in the skeg protects cables for steamers and a source (e.g., air gun array) of a seismic system deployed from the vessel. Tow points on the skeg lie below the water's surface and connect to towlines to support the steamers and the source. A floatation device supports the source and tows below the water's surface to avoid ice floes or other issues encountered at the water's surface. The floatation device has a depth controlled float and one or more adjustable buoyancy floats. The controlled float has its buoyancy controlled with pressurized gas used for the air gun source and actively controls the depth of air gun source in the water. Each of the adjustable float connects in line with the controlled float with flexible connections. Each adjustable float has its buoyancy preconfigured to counterbalance the weight in water of the air gun or portion of the source that the float supports.

A water jet propulsion boat includes a boat body and first and second sponsons on a first side of a rear portion of the boat body. A lower surface of the second sponson is higher than a lower surface of the first sponson, and a rear end of the second sponson is rearward of a rear end of the first sponson.

A water jet propulsion boat includes a boat body and first and second sponsons on a first side of a rear portion of the boat body. A lower surface of the second sponson is higher than a lower surface of the first sponson, and a rear end of the second sponson is rearward of a rear end of the first sponson.

A micro-keel cooler for cooling a coolant flowing through a heat-generating component of a maritime vehicle. The cooler includes an inlet adapted to receive the coolant at a first temperature and an outlet adapted to output the coolant at a second temperature less than the first temperature. The cooler further includes a plurality of tubes fluidly coupled to an inlet mixing chamber of the inlet and an outlet chamber of the outlet and configured to direct the coolant from the inlet mixing chamber to the outlet mixing chamber, and a plate coupled to the inlet and the outlet and disposed adjacent to the tubes, the plate configured to direct a fluid over at least a portion of the tubes to cool the coolant flowing from the inlet mixing chamber to the outlet mixing chamber, the fluid having a cooling temperature that is less than the first temperature.

A micro-keel cooler for cooling a coolant flowing through a heat-generating component of a maritime vehicle. The cooler includes an inlet adapted to receive the coolant at a first temperature and an outlet adapted to output the coolant at a second temperature less than the first temperature. The cooler further includes a plurality of tubes fluidly coupled to an inlet mixing chamber of the inlet and an outlet chamber of the outlet and configured to direct the coolant from the inlet mixing chamber to the outlet mixing chamber, and a plate coupled to the inlet and the outlet and disposed adjacent to the tubes, the plate configured to direct a fluid over at least a portion of the tubes to cool the coolant flowing from the inlet mixing chamber to the outlet mixing chamber, the fluid having a cooling temperature that is less than the first temperature.

A modular keel is arranged along a centerline of a boat hull for displacing a bow wave towards the stern and creating distinct pressure zone situations to draw the keel back into water and reduce pitching. The keel features a base extending along a centerline of the boat hull and two symmetric curved segments. The base tapers toward a vertex on the centerline at a fore transitional area that generates a concentrated high pressure zone to help lift the hull and reduce pitching. The keel includes an aft transitional area for expelling water away from the keel in a laminar flow pattern during forward movement of the boat hull. The keel further includes an intermediate transitional area that creates a low pressure zone to dampen the motion of the hull through waves.

A modular keel is arranged along a centerline of a boat hull for displacing a bow wave towards the stern and creating distinct pressure zone situations to draw the keel back into water and reduce pitching. The keel features a base extending along a centerline of the boat hull and two symmetric curved segments. The base tapers toward a vertex on the centerline at a fore transitional area that generates a concentrated high pressure zone to help lift the hull and reduce pitching. The keel includes an aft transitional area for expelling water away from the keel in a laminar flow pattern during forward movement of the boat hull. The keel further includes an intermediate transitional area that creates a low pressure zone to dampen the motion of the hull through waves.

A watercraft comprises a fiberglass hull and a bow thruster module. The fiberglass hull has a keel and a bow, a recess being formed in the hull extending into the keel proximate to the bow. The bow thruster module is mounted in the recess and includes a housing at least partially defining an athwartships tunnel and a propeller mounted in the tunnel, the housing including a fairing generally continuing a profile of the keel and surrounding hull around the recess.

A watercraft comprises a fiberglass hull and a bow thruster module. The fiberglass hull has a keel and a bow, a recess being formed in the hull extending into the keel proximate to the bow. The bow thruster module is mounted in the recess and includes a housing at least partially defining an athwartships tunnel and a propeller mounted in the tunnel, the housing including a fairing generally continuing a profile of the keel and surrounding hull around the recess.