Understand Your Boat Prop: Pitch vs Diameter + Rotation & DAR Explained

Nav Rules Course - https://www.nauticed.org/powerboating-courses/view/navigation-rules-for-powerboats?utm_source=youtube&utm_medium=video&utm_campaign=BOLovGUppOc
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

00:00 - Intro
00:10 - Diameter
00:24 - Pitch
00:41 - Pitch and RPM
01:16 - Diameter and Pitch
01:49 - Rake
02:07 - Cup
02:32 - Disk Area Ratio
03:20 - Progressive and Constant Pitch
04:30 - Left Hand and Right Hand Props
05:12 - Reading the Prop
05:58 - Outro

#boating #propeller #sailing #boat #powerboat

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