What do the numbers on my propeller mean?

Propeller size is expressed with two numbers, diameter and pitch, with diameter always stated first. Diameter is two times the distance from the center of the hub to the tip of any blade. Pitch is the theoretical forward distance, in inches, that a propeller travels during one revolution.

What do propeller dimensions mean?

Propeller diameter is simply the diameter of a circle scribed by the blade tips of the prop. Propeller pitch is the distance the prop would move forward in one rotation if it were moving through a soft solid—think of a screw being turned into wood. The blades on a propeller are analogous to the threads on a screw.

What is LH rotation?

Left Hand (LH) rotation is considered to be standard while Right hand (RH) is considered an “Opposite” rotation. You should ALWAYS view the the engine rotation while standing behind the engine and looking at the flywheel. A LH engine spins CCW (Standard Rotation) A RH engine spins CW (Opposite Rotation)

Does prop diameter affect RPM?

Why Propeller Diameter is Important Diameter “usually increases for propellers used on slower boats and decreases for faster boats,” the manual continues. Further, “if all other variables remain constant, diameter will increase as power increases; diameter will increase as propeller rpm decreases.”

How do you read a propeller number?

Propeller Sizes are given in a set of numbers, e.g. 13×17 or 19×23 usually labeled on the propeller. The first number is the Diameter (width of the circle of the blades) and the second is the Pitch (theoretical travel distance of the angled blades in one revolution). Two other design features include Rake and Cup.

How do you tell if a motor is clockwise or counterclockwise?

You can determine shaft end perspective by simply holding your motor up in front of you and pointing the shaft at you. If the shaft is pointing at you and rotates to the right, your motor is clockwise shaft end, or CWSE. If the shaft rotates to the left, your motor is counterclockwise shaft end, or CCWSE.

Do marine engines spin backwards?

Usually marine engines are only reverse rotation if it has a mate. 2/6/12 12:46 a.m. the reverse rotation engines can be made into standard rotation by putting in a regular timing set in place of the gear drive.

How do I know what propeller I need?

What prop pitch is faster?

The lower the prop pitch, the better your hole-shot. However, this comes at a price: top speed. The lower pitch makes the engine reach maximum rpm at slower speeds. Conversely, a higher pitch will deliver greater top speeds, but slower acceleration.

Will a smaller prop increase RPM?

Increasing the propeller size may reduce the cruise RPM for the same cruise speed but will also increase the load on the engine and therefore increase the fuel usage needed. In effect, you may reduce the cruise RPM but you burn the same amount of fuel and you increase the stress on the engine.

How big is the blade on a 4 blade propeller?

4 Blade Nibral Diameter 20″ Pitch 24″ Bore 1.75″ Rotation LH Blade Area 0.65 Bayliner.. 4 Blade Nibral Diameter 24″ Pitch 29″ Bore 2.00″ Rotation LH Blade Area 0.835 E.A.R. .. 4 Blade Nibral 13.00 X 12.50 RH 1.00″ Bore with .080 Cup .. 3 Blade Aluminum 15.5 x 18 RH Black Max Hub System included Flo-Torq II Hub Kit..

How do you find the size of a propeller?

Propeller Sizes are given in a set of numbers, e.g. 13×17 or 19×23 usually labeled on the propeller. The first number is the Diameter (width of the circle of the blades) and the second is the Pitch (theoretical travel distance of the angled blades in one revolution).

What kind of brass is used in boat propellers?

Brass and Nibral Inboard Boat Propellers. Nibral is an alloy of nickel, bronze, and aluminum, commonly used in marine parts like boat engine propellers.

What kind of hub does a general propeller use?

General Propeller stocks all makes and models of boat propellers. Please contact us for expert advice. Fury 3 Blade Stainless Steel 14 x 22 RH 48-8M8023090 Hub System – 835257K6 Flo-Torq II Hub Kit inclu..