2013 EBOOK
Lowest Prices Yet

Find Out More...



bass fishing resource tackle tips

bass fishing resource tackle tips


Understanding the basics of prop and outboard performance

Todd SpurgeonBy Todd Spurgeon

Have you considered what your prop has done for you lately? Most people take their prop for granted, without realizing that the shiny silver accessory on the back of their outboard has a direct impact on their boatıs performance, speed, fuel efficiency, handling, engine life and safety.

There are many things to consider when selecting a prop. Some of the general terms are as follows:

Diameter: The distance across the imaginary circle made when the prop rotates. Generally, the heavier the boat, the larger the prop diameter need

Pitch: The theoretical distance, in inches, that a prop travels forward during one revolution. The higher pitch prop the engine can turn, the faster the boat can usually go

W.O.T. Wide open throttle

RPM: Revolutions per minute

Prop size differences have a big impact on boat performance. For example:

To keep it simple, remember that pitch = speed. Increase the pitch to increase the boat speed

Peak boat performance equals a combination of hole shot, mid range performance and top-end speed but you canıt have the best of both worlds ­ propping is a compromise. You canıt have ear ripping speed and an incredible hold shot using one prop. For this reason, if your budget will allow it, running 2 props is recommended.

A 3 Blade prop for top-end speed on calm water situations and a 4 Blade prop for better hole shot in rougher water . Remember that a 4 blade prop generally turns 50 to 100 RPM less than a 3 blade prop with the same pitch, therefore decreasing speed.

Always test your boat on the water after a new prop is installed. Due to differences in hull designs, engines and weight, finding the correct prop for each boat will vary. Whether you are running a 2-stroke, 4-stroke or Optimax, the science of propping remains the same.

For more detailed information about propping, contact your Mercury authorized dealer. Mercury offers a prop-lending program through some of their dealers. Always operate your outboard at the manufacturerıs recommended RPM, because operating the engine outside the recommended RPM can cause severe damage to your engine and may void your warranty. Recommended RPM's, outboard RPM ratings for your outboard motor and other information can be found in the Mercury Outboard Owners Manual, your local Mercury dealer or see the prop selector at www.mercurymarine.com .

back to Pro Bass Fishing Articles Page


Copyright ProBassFishing 2008
All Rights Reserved