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Where to Find Your Prop Pitch

Look on the outer hub of the prop near the blades or inside the hub.

Most props are stamped with a series of numbers.

Pitch is always the last number listed.

Example: 3 x 16 x 24.5R

3 - Number of Blades (occasionally displayed)

16 - Diameter

24.5 - Pitch

R - Direction of Rotation (R = Right/Standard, L = Left/Counter)

 Pitch is stamped on the outer prop hub...   ...or
around the inner hub.
Prop Pitch & RPM's

For safety, and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.


A change in the prop pitch will increase or decrease the engine RPM's and can be used to bring them into the recommended range. A 2" pitch increase (for example, from 21" to 23") will result in approximately a 300-400 RPM decrease and vice versa.


The correct prop allows the engine's RPM to run within the top end of the manufacturers recommendation.

Propeller Help Guide
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Copyright © 1999-2009 iboats, inc.
Yamaha 28 HP 1976 - 1978 Outboard Propellers
You Are Viewing Available Prop Pitches For:
  • Manufacturer:Yamaha
  • Horsepower: 28 HP
  • Years: 1976 - 1978
  • Model: 28 HP Outboard
  • Specs: Non-Thru Hub Exhaust & Pin Drive
  • Max RPM: 4500-5500 RPM
Where to Find Your Prop Pitch Prop Pitch & RPM's

It is critical that your engine operates within the manufacturer-recommended RPM range.

- 2” Pitch will add 400 RPM

+ 2” Pitch will subtract 400 RPM

These changes vary and may not reflect actual change in engine RPM & performance for your specific prop & engine.
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Propeller Help Guide
P is for Propeller Propeller Basics
How To Choose A Prop
Diameter Pitch
Cupping Rake
Ventilation Cavitation

We tell you everything you need to know about props from cupping to ventilation.

 		Learn About Prop Characteristics Prop Characteristics
3 Blades VS. 4 Splines
Left-Handed Props
Performance Exhaust
Aluminum vs. Stainless Steel

If you want to modify your boat's performance, consider the above before making your selection.

 		Learn About Engine RPM Determining RPM's
Effect of pitch on RPM
Test for Maximum RPM



For safety and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.
                                                                                                                                                                                                                               
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