Propellers

Propellers

The goal in propeller selection is to determine what propeller style and size will maximize performance for your boat, while allowing the engine to operate in the recommended RPM range (optimized power band). The correct propeller will prevent the engine from over-revving, yet allow it to reach the preferred RPM where maximum horsepower, load carrying capacity and performance is produced. This mix may change depending on the users needs, boat, load, and engine. Elevation and environmental conditions also affect this computation.

When selecting a propeller it is important to first gauge your intended use. If you normally run your boat with a fixed load you should select a propeller that delivers optimum RPM with that load. If you intend to run a heavy load in the fall, it is best to select a smaller pitch propeller or gearing so that you don't loose RPM and drop below your engine's preferred power band. If you intend to run in different climates and different elevations, propeller choices again will vary.

In varying conditions, it is best to invest in a propeller for lighter loads and another for heavy.

Stock motors run best from 3800 to 4000 rpm. Black Death motors run best from 4000 to 4175 rpm, and the BPS mag engines run best in the 4400 to 4600 rpm range. Note: Mag engines are fitted with a 5100 RPM rev limiter and you can run these motors to this limit without question, however, best performance and engine life is achieved by operating the mag engines near 4600.

Many short tail motors like the Mud Buddy series do not have a broad propeller selection, rather they rely on belt sprocket variations. 

If you can change drive ratios, it is best to select a propeller and/or sprocket ratio combination that runs a bit slower with a new propeller so that the RPMs can increase as the propeller wears.

A one pitch change will result in a 250 to 350 rpm change.

When using these charts - select one pitch smaller prop, or one gear ratio smaller when running above 4000 foot elevation or when operating a larger than normal boat and load.

Short Tail Prop and Sprocket Selection Chart
Engine Propeller Sprocket Size Gear Ratio RPM
Mag7000 12 X 10 40 top / 46 bottom 1.15:1 4400 - 4600
Mag 6000 12 X 10 38/46 1.21:1 4400 - 4600
Mag 5500 12 X 10 38/47 1.24:1 4400 - 4600
Mag 5000 12 X 10 38/47 1.24:1 4400 - 4600
Mag 45 12 X 10 38/48 1.26:1 4400 - 4600
Black Death 5500 12 X 10 40/48 1.20:1 3900 - 4175
Black Death 4500 12 X 10 38/46 1.21:1 3900 - 4175
Stock 35 12 X 10 38/50 1.32:1 3800 - 4000
Stock 27 12 X 10 36/50 1.38:1 3800 - 4000
Stock 23 11X10 or 12X10 34/50 1.47:1 3800 - 4000
Stock 18 10 X 8 32/50 1.56:1 3800 - 4000
Stock 14 10 X 8 32/52 1.63:1 3800 - 4000

 

Super Longtail Prop Selection Chart
Engine Propeller Sprocket Size Gear Ratio RPM
Black Death 4500 11 X 10 34 top / 54 bottom 1.59:1 3900 - 4175
Stock 35 11 X 10 34/56 1.65:1 3900 - 4175
Stock 27 11 X 8 32/54 1.69:1 3800 - 4000
Stock 23 11 X 8 32/56 1.75:1 3800 - 4000

 

Long Tail Prop Selection Chart (3800 to 4000 RPM)
Engine Propeller Engine Propeller
Mag45 10 X 8 Stock 18 9 X 5
Black Death 4500 10 X 8 Stock 14 8 X 4
Stock 35 10 X 5 Stock 12 Gear 10 X 8
Stock 27 9 X 7 Stock 13 8 X 4
Stock 25 9 X 7 Stock 9 7 X 4
Stock 24 9 X 6 Stock 6 Gear 9 X 7
Stock 23 9 X 5 Stock 6 6 X 4

 

 

       

___________________________________________________________
 

The BPS Tiger and Big Blade industry leading propellers feature unmatched durability. finish and balance. These time-proven propellers deliver limited slip and provide exceptional hole shots while cranking out amazing top end speeds. 

Big Blade is a trademark brand.

 


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