Which term describes the flow of water caused by a propeller?

Which term describes the flow of water caused by a propeller?

• A. Backwash
• B. Turbulence
• C. Jet stream
• D. Screw current

Answer: (D)

Propeller-induced water flow is described as screw current. As the propeller turns, its blades push water backward, creating a steady flow of water behind the propeller—the screw current (often referred to as the propeller wash or wake). This is distinct from backwash (water returning after waves), turbulence (random chaotic motion), or jet stream (typically an atmospheric air current). So screw current best describes the flow produced by a propeller.

Propeller-induced water flow is described as screw current. As the propeller turns, its blades push water backward, creating a steady flow of water behind the propeller—the screw current (often referred to as the propeller wash or wake). This is distinct from backwash (water returning after waves), turbulence (random chaotic motion), or jet stream (typically an atmospheric air current). So screw current best describes the flow produced by a propeller.