Jet propulsion boat thrust control system

A jet propulsion boat comprising:

• a boat body;
• a propulsion device that imparts propulsion force to the boat body to propel the boat body;
• an engine and an electric motor that drive the propulsion device;
• control circuitry configured to determine which of an engine mode and an electric mode is to be used as an operation mode of driving the propulsion device in accordance with a condition, the engine mode configured to drive the propulsion device with the engine and the electric mode configured to drive the propulsion device with the electric motor while stopping the engine, and controls the engine and the electric motor to drive the propulsion device in the determined operation mode;
• and
• a falling overboard detector configured to detect that a driver of the jet propulsion boat has fallen into the water,
• wherein the control circuitry determines the operation mode to be the electric mode when the falling overboard detector detects that the driver has fallen into the water.

A jet propulsion boat comprising:

• a boat body;
• a propulsion device that imparts propulsion force to the boat body to propel the boat body;
• an engine and an electric motor that drive the propulsion device;
• and
• control circuitry configured to determine which of an engine mode and an electric mode is to be used as an operation mode of driving the propulsion device in accordance with a condition, the engine mode configured to drive the propulsion device with the engine and the electric mode configured to drive the propulsion device with the electric motor while stopping the engine, and controls the engine and the electric motor to drive the propulsion device in the determined operation mode, wherein:
• the control circuitry includes area determination circuitry configured to detect whether the boat body is located within a predetermined restriction area, and when the area determination circuitry determines that the boat body is located within the predetermined restriction area, the control circuitry determines the operation mode to be the electric mode.