Boat Propeller Basics: Diameter, Pitch, Rake, Cup & DAR Explained

Nav Rules Course - https://www.nauticed.org/powerboating-courses/view/navigation-rules-for-powerboats New England Propeller - https://neprop.com Confused by prop specs? In this full, plain-English guide with New England Propeller, we break down what diameter, pitch, rake, cup, and DAR (disc area ratio) actually mean—and how each affects acceleration, top speed, fuel economy, and handling. We’ll show you how to read prop markings, verify the real specs when stamps are worn, understand progressive vs. constant pitch, and identify left-hand vs. right-hand rotation (and when it matters). What you’ll learn: - Diameter, pitch, rake, cup, DAR—simple definitions + on-water impact - How to read/confirm prop markings (even if the stamp is faded) - Progressive vs. constant pitch: holeshot, mid-range, and efficiency trade-offs - Left-hand vs. right-hand rotation: how to tell, twin setups, and docking effects - Practical tips to talk to a prop shop with confidence #boating #propeller #sailing #boat #powerboat