Boat Propellers
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Finding the right prop is easy!
Search outboards & sterndrives...
Choose a prop pitch & rotation...
Easily buy your new low-priced prop!
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Hundreds of boat propellers at the best prices.
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Solas, Michigan Wheel, Stiletto, Turning Point.
Easily find the savings on your new propeller.
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MinnKota and MotorGuide offer a wide range of replacement props to fit all existing and many discontinued trolling motors.
High-performance replacement impellers for a wide range of Personal Watercraft including:
We carry inboard props specifically designed for ski & tow boats.
Just start typing characteristics about your boat's engine. You can type in horsepower, model name, liters, year, etc.
Possible engine matches will be displayed below your search query. Keep typing to further narrow the list. Once you see the engine that most closely matches yours, select it using your mouse or the up/down arrow keys.
Select the pitch & rotation of propellers you wish to see, then click "Find Prop"
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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...
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...oraround the inner hub. |
Props spin either clockwise (standard or right-hand rotation) or counter-clockwise (counter or left-hand rotation).
Most single engines use a standard rotation prop. Most twin engines use one of each.
To determine what prop rotation you have, look at your prop as if on a boat. Position a blade pointing straight up. If the right-hand side of the blade is closer to the boat than to you, it's a standard rotation prop.
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Props are often stamped with both dimensions and a part number. Look on the outer hub of the prop near the blades or inside the hub. Numbers similar to 15 x 17 are the prop dimensions (diameter & pitch). Those numbers are not your part number! Part numbers resemble 031018, 48-11320A40, 2231-103-12, etc. |
Look around the inner hub or on the blades.
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15 1/2x17 is not the propeller part number!
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Volvo Penta DuoProps have a front and rear propeller that rotate back to back on the same drive. The front propeller is closest to the boat and hits the water first.
DuoProps have both a counter and standard rotation prop to eliminate steering torque. The front prop is always counter rotation. The rear prop is always standard rotation.
Volvo Penta DuoProps are each stamped with a size code (D2, F5, T9, etc) that is used to find a prop replacement. With this code you can replace either the front or rear pieces, or the complete DuoProp.
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Why Buy From Us? Ease of Use Prop Selection ToolEasily find a replacement boat propeller for your outboard, sterndrive or outdrive boat engine. iboats.com carries marine propellers designed for Mercury, Yamaha, Evinrude, Johnson, Honda, Suzuki, Tohatsu, Mariner, Force, Nissan, and Chrysler outboard motors. We also carry Mercruiser, Volvo Penta, OMC Sterndrive Cobra, and Yamaha stern drive boat motor props.The Most Boat Props Onlineiboats.com has the largest selection of propellers anywhere. You'll find discount prices on all the top quality prop brands including Michigan Wheel, Solas Props, Turning Point Propellers, Stiletto Precision Propellers, Quicksilver Props, and Volvo Penta QL & Original Factory DuoProp Propellers.These performance boat propeller brands are available in 3 blade and 4 blade, and in either value priced aluminum or durable stainless steel props. With the most in-stock props available anywhere, you're sure to find the right size prop diameter and prop pitch, and in standard, right hand rotation or counter, left hand rotation. Do you know the part number of your old prop? Use the iboats.com Propeller Part Number Search tool for quick exact-prop matches on any propeller brand, including: Michigan Match, Vortex, Ballistic, Apollo, Hustler, Rascal, Express, Amita, Lexor, Titan, Saturn, Black Diamond, Thunderbolt, Torrent, Silverado, Lightspeed, or Typhoon propellers. Propeller Special SalesFind blowout pricing on hundreds of discount props using the iboats.com boat prop calculator. As the largest online retailer of boat props, we often have manufacturers give us clearance props, inventory overruns, and other great prop deals. Shop now to find sale props with free shipping and blowout prices up to 70% off.How to Choose a Prop
Choosing a Boat Propeller
The optimum propeller selection for your particular application is one that will allow your boat's engine - with your normal load aboard - to develop full-throttle RPM within the engine manufacturer's recommended maximum RPM range. Recommended RPM
Every engine manufacturer states the recommended RPM range as part of the engine specifications. Damage to the engine can occur if a propeller that allows the engine to over-rev (attain a full-throttle RPM higher than the specification) is installed. Damage can also occur if the installed propeller causes the engine to lug - not reach the minimum specification. Overall best acceleration and top-end speed will be achieved when your full-throttle RPM is near the midpoint of the manufacturer's recommended maximum RPM range. Matching Prop to Engine
Outboard motors 30 HP and higher, Sterndrives and Inboards require the most attention to correct propeller selection. The smaller outboards come with all-purpose props that meet most requirements. An onboard tachometer to monitor engine RPM is also commonly installed with the larger engine installations. Most boats are delivered from the dealership or factory with propellers that have been properly matched for the most common usage. Make note of the part number that is usually cast into the propeller itself, and you'll be forever able to order an exact replacement using our Boat-Prop Finder. Pitch & Diameter
The two important propeller dimensions that you'll need to consider are pitch and diameter. In most cases the propeller and engine manufacturers have pre-selected the diameter range needed for your engine. Your propeller selection can be focused almost exclusively on pitch. Your boat will respond to different pitch propellers the way your car responds to different gear positions in your car's transmission. Moving to a higher pitch propeller will result in a decrease in your full-throttle RPM, just like the effect when your car's transmission shifts to a higher gear. The reverse is also true: move to a lower pitch propeller and your full-throttle RPM will increase. Most propellers are sized by two-inch intervals, example 17", 19", 21", etc, and a 2" pitch change will result in an average 300 to 400 full-throttle RPM change. Spare Props
It's always a good idea to keep a spare prop aboard, but here's a way to get double-duty from that investment. If your family is into tow watersports, it's likely that your boat's performance can benefit from a prop change of 2" less pitch whenever you head out for a day of skiing. The improved acceleration will really be appreciated by the water skier you're pulling. Just don't forget to change back to your standard prop on those days that you're just out cruising. Prop Material
Most propellers are constructed of either aluminum or stainless steel, and utilize a softer hub material to protect your engine's drive train. Aluminum propellers are less costly, but more prone to damage. Stainless steel propellers are usually about 3 times more expensive than their aluminum counterparts, but far more durable. Some boaters also experience better overall performance with stainless steel because the material's tensile strength allows the manufacturer to cast the blades thinner. Propeller Basics - Diameter
Propeller Basics - Pitch
Propeller Basics - Cupping
Propeller Basics - Rake
Propeller Basics - Ventilation
Ventilation
Ventilation is a situation where surface air or exhaust gasses are drawn into the propeller blades. When this situation occurs, boat speed is lost and engine RPM climbs rapidly. This can result from excessively tight cornering, a motor that is mounted very high on the transom, or by over-trimming the engine. Propeller Basics - Cavitation
Propeller Characteristics - Blades
3 blades... or 4?
We recommend 3-blade propellers for recreational boats with 3, 4, and 6 cylinder outboards and I/0 engines. 3-blade props provide good "hole shot" and top-speed performance. We recommend 4-blade propellers for bass boats and boats with high performance hulls running high horsepower outboard engines. Compared to 3 blades, 4-blade props provide better "hole shot" performance with less steering torque and less vibration at high speeds. When switching from 3 to 4-blades, generally a 1" pitch decrease is required. So, a 21" pitch 3-blade prop is replaced with a 20" pitch 4-blade prop. Pitch is increased when switching from 4 to 3-blades. Propeller Characteristics - Spline Count
Propeller Characteristics - Rotation
Propeller Characteristics - Performance
How does pitch and slip affect performance ...and how is it measured?
Slip is the difference between actual and theoretical travel of the propeller blades through water. A properly matched propeller will actually move forward about 80 to 90 percent of the theoretical pitch. Propeller Characteristics - Exhaust
Propeller Characteristics - Aluminum Vs. Stainless Steel
Determining RPM's
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