What statement is true with respect to the...

🔍 Key Concepts

• Ahead motion: Think about which way the water flows relative to the propeller when the vessel is moving ahead. • Face vs. back of the blade: One side pushes on the water (higher pressure), the other side has lower pressure (suction). • Pressure side vs. suction side: The pressure side is where the water is being pushed, not where it is being drawn from.

💭 Think About

• When the ship moves ahead, does the water move past the propeller from ahead to astern, or astern to ahead? Use that to define upstream and downstream. • Which side of the propeller actually "pushes" the water to drive the vessel forward—the side facing the incoming flow or the side facing where the water exits? • In propeller terminology, which name is usually given to the pushing side of the blade: face or back?

✅ Before You Answer

• Be clear on what upstream and downstream mean relative to water flow through the propeller during ahead motion. • Confirm which surface is commonly called the face and which is the back in marine propeller terminology. • Verify that the pressure side must be the surface where the water pressure is higher because the blade is doing work on the water, not the suction side.

What statement is true with respect to the pressure side of a propeller blade?

The pressure side of the propeller blade is the side of the blade which faces downstream during ahead motion and is also known as the back of the blade.

The pressure side of the propeller blade is the side of the blade which faces upstream during ahead motion and is also known as the back of the blade.

The pressure side of the propeller blade is the side of the blade which faces upstream during ahead motion and is also known as the face of the blade.

The pressure side of the propeller blade is the side of the blade which faces downstream during ahead motion and is also known as the face of the blade.

🔍 Key Concepts

💭 Think About

✅ Before You Answer