Propeller adjustment guide (2023)

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2) Learn how propellers are built

Propellers are made from a variety of materials, shapes and sizes to suit the wide range of applications and conditions in which a propeller must perform. If you're looking to replace your propeller with one that better suits your needs, it's helpful to learn a little about propeller construction, the types of propellers, the materials used in propeller construction, the number of blades on a propeller, and other • Blade performance factors .

Materials to craft Propellers:

High-speed propellers are commonly made of aluminum or stainless steel, each with their own characteristics. Aluminum propellers come in a wide variety of sizes and configurations.

Number of Blades:

Propellers are usually available with either three or four blades.

Design-Element:

Propeller sizes are given in a series of numbers, e.g. 13x17 or 19x23 usually marked on the propeller. The first number is thediameter(blade circle width) and the second is theTom(theoretical offset distance of the protractors in one revolution).

Two other design features arerakeeTaxes. These elements are not marked on the helix. OrakeThe measurement indicates the angle of inclination of the blades towards the gearbox or away from the gearbox. A 0 degree pitch propeller has blades that are 90 degrees perpendicular to the center of the cube. A 20 degree pitch results in a blade at a 70 degree angle from the hub.Taxesis a curved edge added to the trailing edge or tip of the blade. Both Rake and Cup are set by the propeller manufacturer BUT they can be changed by a professional propeller tuner to modify the performance of the propellers.

Propellers turn either clockwise or counterclockwise. The usual rotation of a propeller is clockwise; is often referred to as a right turn, right, or just "R". When running twin engines on a powerboat, the engines tend to turn in opposite directions. In counter-rotating engines, one propeller turns right or clockwise and the other propeller turns left or counterclockwise. A left-hand propeller can be labeled - 13x17L

Most propellers have a grooveflexible rubberBushing in the hub that connects the propeller to the propeller shaft. This rubber acts as a shock absorber when the propeller hits something hard, causing the rubber to flex and helping protect the gear components from damage.

3) Propeller performance factors

Choosing your next propeller and using it go hand in hand, as determining your boat and engine usage will help determine the right propeller. Factors to look out for are the boat AND the engine.

Finally, when choosing your propeller, the manufacturer's recommendation is a good place to start, so;

1. Test drive your engineVollgas (WOT).
2. Record the result in WOT with a tachometer.
3. The maximum rated power (the engine power) of a marine engine falls within a narrow range of RPM, typically 5000-5500 for two-stroke engines and 5000-6000 for four-stroke engines. If you're running above or below your RPM range, consider a different propeller.

Use the following recommended guidelines to help select a replacement or upgraded propeller with a larger or smaller pitch:

By keeping the same diameter and pitch –

• Adding 1 inch of propeller pitch reduces WOT by 150-200.
• Subtracting 1 inch from the propeller pitch increases full throttle RPM by 150-200.
• When transitioning from a 3-blade prop to a 4-blade prop, a 4-blade prop will generally spin 50-100 RPM less than a 3-blade prop of the same pitch.
• Changing from an unshelled prop to a cupped prop will also reduce your RPM by 200.

For example, if you went out and drove a Mercury 150 EFI:

1. WOT operating range= 5000-5600 U/min
2. High end of operating range (highest power) = 5600 rpm
3. Odometer reading during test = 4800 rpm
4. Difference = 800 rpm

Knowing this, take the difference in the example above at 800 and divide by 200. The result is 4. The propeller to be used is 4 inches less pitch than the propeller used during the test. Ultimately, you may need to take an appointment or be prepared for a propeller change.Interchangeable propeller systems(and all are compatible) such as the Solas Rubex System, Flo-Torq and Vortex are a quick change option. For propeller selection, advice or confirmation, contact Go2marine at1-800-998-9508orInternational +1-206-780-5670.

4) Installation instructions for Solas propellers

It is very important to read your engine owner's manual for important safety precautions when installing the propeller. Depending on the engine/gearbox manufacturer, use genuine propeller parts - thrust washer, spacer, locking tab, nut and cotter pin. This is a universal installation guide.

1. Place the stock thrust washer onto the propeller shaft exactly as it was removed. The cone of the thrust washer must match the cone of the propeller shaft exactly.
2. Lubricate the propeller shaft.
3. Slide the propeller assembly onto the propeller shaft.
4. Install spacers or washers as needed. See engine/transmission manual.
5. If necessary, attach the locking plates. See engine/transmission manual.
6. Install the axle nut. Refer to engine/transmission manual for proper torque.
7. Install the cotter pin or bend the locking tabs to keep the propeller shaft nut from loosening. See engine/transmission manual. The image may not exactly match your application. Consult the user manual