A device with two or more twisted blades that is designed to move a boat through water, connected to the engine by a shaft.

A device with two or more twisted blades that is designed to move a boat through water, connected to the engine by a shaft.

• A. Boat Plug
• B. Winch
• C. Propeller
• D. Shear Pin

Answer: (C)

Propeller. It’s the device with two or more twisted blades that, when the engine turns the shaft, pushes water backward to create forward thrust and move the boat. The angled blades convert rotational energy into linear thrust, so the boat moves ahead as water is accelerated rearward. A boat plug is a drain for bilge water, a winch is for winding rope or cable to lift or pull loads, and a shear pin is a safety link that can break to protect the drivetrain—none of these propel the boat through the water the way a propeller does.

Propeller. It’s the device with two or more twisted blades that, when the engine turns the shaft, pushes water backward to create forward thrust and move the boat. The angled blades convert rotational energy into linear thrust, so the boat moves ahead as water is accelerated rearward. A boat plug is a drain for bilge water, a winch is for winding rope or cable to lift or pull loads, and a shear pin is a safety link that can break to protect the drivetrain—none of these propel the boat through the water the way a propeller does.