What are the propeller specifications?

• A. 15 3/8 X 18P, 3 blade propeller (counter rotating)
• B. 14 X 19P, 2 blade propeller
• C. 16 X 20P, 4 blade propeller
• D. 13 1/2 X 17P, 3 blade propeller

Answer: (A)

Propeller specs describe how the prop moves water and, in turn, how the boat performs. The diameter tells you the size of the circle the blade sweeps; a larger diameter can push more water but also adds drag. The pitch is like the theoretical distance the prop would travel forward in one revolution if the water were solid; an 18P pitch is relatively high, meaning more speed potential at a given engine rpm, but it requires enough power to overcome the higher load. The number of blades affects thrust and efficiency: three blades strike a balance between solid thrust and reasonable drag, compared with two blades (lighter and potentially quicker RPM response but less in-ground thrust) or four blades (more drag but smoother, higher-thrust operation under load). The note about counter rotating means the boat uses opposing rotations on the propulsion system to cancel out torque effects, improving straight-line tracking and helm feel during acceleration and turns. This exact combination—15 3/8 inch diameter, 18P pitch, three blades, with counter-rotating design—provides the appropriate balance of thrust, speed, handling, and efficiency for this vessel. The other options would alter thrust, speed, or handling characteristics in ways not suited to the boat’s propulsion setup.