A boat propeller is a crucial component in the propulsion system of a boat, responsible for converting the engine's rotational power into forward or backward thrust. They come in various sizes and styles, each designed to match specific boat types and performance needs. The design of the propeller affects the boat's speed, handling, and fuel efficiency, making its selection important for optimal boat performance. In our online shop, we stock a variety of options to match your boat's specifications. Ensure you choose the right hub and bearing for a smooth fit and operation, whether you need a right-hand (RH) prop or another configuration. Our knowledgeable customer support team is ready to assist you in finding the perfect propeller to enhance your boat's performance and reliability.
|
1-2 weeks delivery time The Max-Prop Boomerang 101 / 5 Blade 18" Spinner 101mm automatically moves into shaft position when no torque is applied, ensuring minimal drag for sailboats with hydraulic transmissions. Its patented radial spring package positions blades at idle or off, providing smooth operation, up to 80% more reverse power, low drag, easy bolt-on installation, external pitch adjustment, and wide shaft compatibility.
|
$ 10,250.51
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 101 / 5 Blade 19" Spinner 101mm aligns into shaft position automatically when engine torque stops, reducing drag and improving sailing performance. The integrated radial spring system ensures blades are in vane position at idle or off, offering high efficiency, up to 80% more reverse thrust, low drag, simple mounting, and compatibility with shafts ø35–100mm.
|
$ 10,250.51
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 101 / 5 Blade 20" Spinner 101mm instantly moves into shaft position when torque stops, providing very low drag and reliable performance. Its patented radial spring system keeps blades in default vane position at idle or off, with smooth anti-shock operation, up to 80% more reverse power, easy bolt-on installation, and wide shaft compatibility.
|
$ 10,250.51
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 101 / 5 Blade 21" Spinner 101mm automatically shifts blades into shaft position when torque is removed, reducing drag for modern sailboats. Its integrated radial spring package ensures blades are in vane position at idle or off, offering high efficiency, up to 80% more reverse power, low drag, easy installation, and wide shaft compatibility.
|
$ 10,356.49
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 101 / 5 Blade 22" Spinner 101mm aligns into shaft position automatically when torque stops, minimizing drag and improving sailing speed. The radial spring system positions blades at idle or off, delivering up to 80% more reverse thrust, smooth anti-shock operation, simple bolt-on installation, and compatibility with shafts ø35–100mm.
|
$ 10,356.49
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 101 / 5 Blade 23" Spinner 101mm moves blades into shaft position instantly when no torque is applied, ensuring low drag and reliable performance. Its patented radial spring package positions blades at idle or off, providing up to 80% more reverse power, smooth operation, external pitch adjustment, and wide shaft compatibility.
|
$ 10,601.25
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 111 / 5 Blade 20" Spinner 111mm automatically moves into shaft position when no torque is applied, reducing drag for sailboats with hydraulic transmissions. Its integrated radial spring package ensures blades are in vane position at idle or off, offering high efficiency, up to 80% more reverse power, smooth anti-shock operation, easy bolt-on installation, and wide shaft compatibility.
|
$ 14,895.73
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 111 / 5 Blade 21" Spinner 111mm aligns into shaft position automatically when engine torque stops, minimizing drag and improving sailing performance. The radial spring system ensures blades stay in vane position at idle or off, providing up to 80% more reverse thrust, smooth anti-shock operation, simple mounting, and compatibility with shafts ø35–100mm.
|
$ 14,895.73
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 111 / 5 Blade 22" Spinner 111mm instantly moves into shaft position when torque is removed, ensuring very low drag and reliable performance. Its patented radial spring package keeps blades in vane position at idle or off, with smooth operation, up to 80% more reverse power, easy bolt-on installation, and wide shaft compatibility.
|
$ 15,171.23
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 111 / 5 Blade 23" Spinner 111mm automatically shifts blades into shaft position when no torque is applied, reducing drag for modern sailboats. Its integrated radial spring system positions blades at idle or off, offering high efficiency, up to 80% more reverse power, low drag, simple installation, and wide shaft compatibility.
|
$ 15,171.23
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 111 / 5 Blade 24" Spinner 111mm aligns into shaft position automatically when torque stops, minimizing drag and improving sailing performance. The radial spring package ensures blades stay in vane position at idle or off, delivering up to 80% more reverse thrust, smooth anti-shock operation, simple bolt-on mounting, and compatibility with shafts ø35–100mm.
|
$ 15,409.10
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 111 / 5 Blade 25" Spinner 111mm moves blades into shaft position instantly when no torque is applied, ensuring very low drag and reliable performance. Its patented radial spring system keeps blades in default vane position at idle or off, providing smooth operation, up to 80% more reverse power, easy installation, and wide shaft compatibility.
|
$ 15,652
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 120 / 5 Blade 22" Spinner 120mm automatically moves into shaft position when torque is removed, reducing drag for sailboats with hydraulic transmissions. Its patented radial spring package positions blades at idle or off, offering up to 80% more reverse power, smooth anti-shock operation, easy bolt-on installation, external pitch adjustment, and compatibility with shafts ø35–100mm.
|
$ 17,339.06
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 120 / 5 Blade 23" Spinner 120mm automatically aligns into shaft position when engine torque stops, reducing drag and improving sailing performance. Its patented radial spring system positions blades at idle or off, providing up to 80% more reverse thrust, smooth anti-shock operation, easy bolt-on mounting, external pitch adjustment, and compatibility with shafts ø35–100mm.
|
$ 17,339.06
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 120 / 5 Blade 24" Spinner 120mm moves blades into shaft position instantly when no torque is applied, ensuring very low drag and reliable performance. The integrated radial spring package keeps blades in vane position at idle or off, offering up to 80% more reverse power, smooth operation, simple bolt-on installation, external pitch adjustment, and wide shaft compatibility.
|
$ 17,576.93
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 120 / 5 Blade 25" Spinner 120mm automatically shifts into shaft position when torque stops, minimizing drag for modern sailboats with hydraulic transmissions. Its patented radial spring system positions blades at idle or off, providing high efficiency, up to 80% more reverse power, smooth anti-shock operation, easy bolt-on installation, and external pitch adjustment.
|
$ 17,576.93
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 120 / 5 Blade 26" Spinner 120mm aligns into shaft position automatically when engine torque stops, reducing drag and enhancing sailing speed. The integrated radial spring package ensures blades are in vane position at idle or off, delivering up to 80% more reverse thrust, low drag profile, smooth operation, simple mounting, external pitch adjustment, and wide shaft compatibility.
|
$ 18,011.49
-
+
| ||
|
1-2 weeks delivery time The Max-Prop Boomerang 120 / 5 Blade 27" Spinner 120mm instantly moves into shaft position when no torque is applied, ensuring low drag and reliable sailing performance. Its patented radial spring system keeps blades in default vane position at idle or off, offering up to 80% more reverse power, smooth anti-shock operation, simple bolt-on installation, external pitch adjustment, and compatibility with shafts ø35–100mm.
|
$ 18,011.49
-
+
| ||
|
1-2 weeks delivery time The Max Prop adjusting bolt M10 with a 16° angle allows precise pitch adjustment for Max Prop spinners E78, E85, and E90, made from durable stainless steel and suitable for marine use.
|
$ 49.28
-
+
| ||
|
1-2 weeks delivery time The Max Prop M10 adjusting bolt with an 18° angle provides reliable and accurate pitch adjustment for spinners E78, E85, and E90, constructed from high-quality stainless steel for corrosion resistance.
|
$ 49.28
-
+
| ||
What are the differences between inboard and outboard boat propellers?
Inboard and outboard boat propellers differ primarily in their placement and integration with the boat's engine. Inboard propellers are part of a system where the engine is mounted inside the boat, driving the propeller through a shaft that extends to the hull's exterior. This setup is commonly used in larger boats and offers better protection for the propeller. Outboard propellers, on the other hand, are attached to an outboard motor, which is mounted externally on the stern of the boat. This arrangement provides easier access for maintenance and replacement, and is typical for smaller boats and sailing vessels. Additionally, inboard propellers often require a more complex and protected installation, while outboard setups allow for greater flexibility and ease of handling.
When searching for boat props, it's important to find the right propeller for your boat to ensure optimal performance. We offer a wide range of boat propellers for sale, including performance propellers, sterndrive, and general propeller-GP models. Our inventory includes PowerTech propellers and custom inboard propellers, perfect for ski and wake boats. Our expert team can help you with any custom inboard propeller needs and provide replacement boat propellers. We strive to offer one of the largest selections of boat props at the lowest prices. Whether you're dealing with a bent prop shaft or need a duo blade powertech prop, we aim to provide consistent quality and fuel economy.
How do the materials used in inboard boat props and shaft affect their performance and durability?
The materials used in boat propellers significantly influence their performance and durability. Bronze propellers, commonly used in many inboard applications, offer excellent corrosion resistance and durability, making them suitable for long-term use in saltwater environments. Stainless steel propellers, on the other hand, provide a stronger alternative with greater impact resistance and less flex under load, enhancing performance by maintaining more precise blade shape at higher speeds.
Both materials ensure that the propellers can withstand the harsh marine environment while supporting the specific performance requirements of different types of boats, from sailing vessels to motor-driven crafts.
What is the impact of inboard propellers blade count on a boat’s maneuverability and thrust?
The number of blades on a boat propeller plays a crucial role in determining the boat's maneuverability and thrust. Generally, a propeller with more blades, such as a four or five-blade propeller, provides smoother operation and better traction in the water, which enhances maneuverability at lower speeds and in tight conditions. Fewer blades, like those on a three-blade propeller, typically generate greater top speed and are more efficient, making them ideal for faster inboard and outboard boats. The choice of blade count should align with the boat's intended use and performance goals, whether it's for leisurely sailing or high-speed boating, ensuring optimal propulsion and handling characteristics.
Find the ideal setup for your boating style in our complete range of Outboard Propellers.
What are the basics of inboard boat propellers and how do they differ from other types?
| Aspect | Inboard Propeller System | Other Propulsion Types (Outboard, Sterndrive) |
|---|---|---|
| Engine Location | Mounted centrally inside the hull, forward of the transom. | Engine or drive unit is attached to or through the transom. |
| Propeller Drive | Fixed propeller shaft connected directly to the transmission. | Propeller is on a vertical driveshaft or integrated lower unit. |
| Steering Mechanism | Rudder directs water flow from the propeller for directional change. | The entire motor or drive unit swivels to change thrust vector. |
| Efficiency & Vibration | Long, straight shaft alignment promotes smooth, efficient power transfer. | Universal joints or gears in lower units can absorb more energy. |
| Typical Hull Suitability | Common on larger sailboats, trawlers, cruisers, and workboats. | Dominant on smaller recreational powerboats and runabouts. |
How does choosing between a 3-blade and 4-blade propeller affect performance and fuel efficiency?
A 3 blade propeller often provides a slight edge in top speed and maximum efficiency for lightweight, faster hulls. In contrast, a 4 blade propeller typically offers superior low-speed thrust, smoother operation, and better cruise efficiency for heavier vessels, trading a bit of peak speed for improved grip and handling.
What do diameter and pitch mean when selecting the right inboard propeller?
Diameter is the circle described by the blade tips, governing thrust and load capacity. Pitch is the theoretical forward travel per revolution, dictating speed and engine load.
Together, they define the right prop for your engine and hull:
- A larger diameter increases low-end thrust.
- More pitch allows higher potential speed.
- Incorrect combinations cause over or under-revving.
How does the bore size influence the fit and balance of an inboard boat propeller?
The bore is the central hole that mates the propeller to the tapered shaft. An imprecise fit causes wobbling, vibration, and potential damage to the shaft or strut. A perfectly matched bore, often achieved through CNC machining by brands like Acme Marine, ensures concentric balance and secure keyway engagement for marine propulsion integrity.
Where can you find high-quality inboard propellers for sale from brands like Acme?
Specialist prop shops and major marine distributors maintain an extensive inventory of inboard units from leading manufacturers. Propellers are available directly from select boat builders or through authorized online retailers that cater to yacht and commercial operators. Brands like Michigan Wheel, OJ, and VEEM offer robust options in NiBral material known for its strength and corrosion resistance.