Abstract: An outboard marine propulsion system with a closed loop lower unit heat exchanger is described. The closed loop lower unit heat exchanger provides improved cooling to outboard marine propulsion units and increases engine life compared with traditional open loop cooling systems, particularly in harsh environments such as salt water, brackish water, swamp, shallow or sediment and debris rich water. The closed loop lower unit heat exchanger also provides improved performance to the outboard marine propulsion system when mounted to an appropriate portion of the lower unit of the outboard marine engine such as the anti-cavitation plate.

Abstract: An outboard marine propulsion system with a closed loop lower unit heat exchanger is described. The closed loop lower unit heat exchanger provides improved cooling to outboard marine propulsion units and increases engine life compared with traditional open loop cooling systems, particularly in harsh environments such as salt water, brackish water, swamp, shallow or sediment and debris rich water. The closed loop lower unit heat exchanger also provides improved performance to the outboard marine propulsion system when mounted to an appropriate portion of the lower unit of the outboard marine engine such as the anti-cavitation plate.

Abstract: An outboard marine propulsion system with a closed loop lower unit heat exchanger is described. The closed loop lower unit heat exchanger provides improved cooling to outboard marine propulsion units and increases engine life compared with traditional open loop cooling systems, particularly in harsh environments such as salt water, brackish water, swamp, shallow or sediment and debris rich water. The closed loop lower unit heat exchanger also provides improved performance to the outboard marine propulsion system when mounted to an appropriate portion of the lower unit of the outboard marine engine such as the anti-cavitation plate.

Abstract: An outboard marine propulsion system with a closed loop lower unit heat exchanger is described. The closed loop lower unit heat exchanger provides improved cooling to outboard marine propulsion units and increases engine life compared with traditional open loop cooling systems, particularly in harsh environments such as salt water, brackish water, swamp, shallow or sediment and debris rich water. The closed loop lower unit heat exchanger also provides improved performance to the outboard marine propulsion system when mounted to an appropriate portion of the lower unit of the outboard marine engine such as the anti-cavitation plate.

Abstract: A marine propulsion unit is described. The marine propulsion unit allows for shallow, obstructed, or otherwise impeded operation of a vessel through a novel marine propulsion transfer unit that is, or can be, mechanically coupled to an outboard motor or other similar marine motor. A mount for raising and lowering the marine propulsion unit in a generally vertical direction allows for adjustment of operating depth of the marine propulsion unit to accommodate a wide range of operating conditions from shallow and obstructed water to traditional deep water operation.

Abstract: A marine propulsion unit is described. The marine propulsion unit allows for shallow, obstructed, or otherwise impeded operation of a vessel through a novel marine propulsion transfer unit that is, or can be, mechanically coupled to an outboard motor or other similar marine motor. A mount for raising and lowering the marine propulsion unit in a generally vertical direction allows for adjustment of operating depth of the marine propulsion unit to accommodate a wide range of operating conditions from shallow and obstructed water to traditional deep water operation.