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.
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1-2 weeks delivery time The Max-Prop Boomerang 120 with 26" pitch delivers powerful thrust and excellent control, using a patented radial spring system that ensures the blades automatically align into the vane position as soon as torque is removed from the propeller shaft.
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$ 15,687.95
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1-2 weeks delivery time The Max-Prop Boomerang 120 with 27" pitch is designed for yachts requiring strong propulsion and precise maneuverability, with a spring-loaded blade mechanism that automatically moves the blades into the shaft position when the engine is switched off, independent of boat speed or shaft rotation.
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$ 15,687.95
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1-2 weeks delivery time The Max-Prop Boomerang 101 / 4 Blade 18" Spinner 101mm is a folding propeller for modern sailboats that automatically moves into shaft position when torque stops, reducing drag. It features high efficiency, up to 80% more reverse power, low drag, easy bolt-on installation, external pitch adjustment, and fits shafts ø35–100mm.
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$ 9,225.64
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1-2 weeks delivery time The Max-Prop Boomerang 101 / 4 Blade 19" Spinner 101mm automatically aligns blades at idle or off, providing low drag and up to 80% more reverse thrust. It is easy to install, externally adjustable, and fits shafts ø35–100mm.
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$ 9,225.64
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1-2 weeks delivery time The Max-Prop Boomerang 101 / 4 Blade 20" Spinner 101mm moves into shaft position when torque is removed, offering high efficiency, smooth operation, up to 80% more reverse power, low drag, and simple bolt-on installation for shafts ø35–100mm.
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$ 9,225.64
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1-2 weeks delivery time The Max-Prop Boomerang 101 / 4 Blade 21" Spinner 101mm automatically shifts blades into vane position at idle or off, reducing drag and improving reverse power by up to 80%. Easy bolt-on installation and external pitch adjustment included.
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$ 9,321.38
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1-2 weeks delivery time The Max-Prop Boomerang 101 / 4 Blade 22" Spinner 101mm aligns automatically into shaft position when idle, ensuring low resistance, smooth operation, up to 80% more reverse thrust, and simple mounting for shafts ø35–100mm.
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$ 9,321.38
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1-2 weeks delivery time The Max-Prop Boomerang 101 / 4 Blade 23" Spinner 101mm moves into shaft position when torque stops, providing minimal drag, high efficiency, up to 80% more reverse power, and easy installation.
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$ 9,566.15
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1-2 weeks delivery time The Max-Prop Boomerang 111 / 4 Blade 20" Spinner 111mm automatically shifts blades at idle or off, offering smooth operation, low drag, up to 80% more reverse power, and simple bolt-on installation.
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$ 13,405.56
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1-2 weeks delivery time The Max-Prop Boomerang 111 / 4 Blade 21" Spinner 111mm aligns blades automatically at idle, reducing drag, improving reverse thrust, and fitting shafts ø35–100mm.
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$ 13,405.56
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1-2 weeks delivery time The Max-Prop Boomerang 111 / 4 Blade 22" Spinner 111mm moves into shaft position when torque is removed, ensuring low drag, smooth operation, up to 80% more reverse power, and easy installation.
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$ 13,655.36
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1-2 weeks delivery time The Max-Prop Boomerang 111 / 4 Blade 23" Spinner 111mm automatically positions blades at idle, providing high efficiency, low drag, up to 80% more reverse power, and simple mounting.
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$ 13,655.36
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1-2 weeks delivery time The Max-Prop Boomerang 111 / 4 Blade 24" Spinner 111mm aligns automatically when idle, offering smooth operation, low drag, up to 80% more reverse thrust, and bolt-on installation.
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$ 13,867.52
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1-2 weeks delivery time The Max-Prop Boomerang 111 / 4 Blade 25" Spinner 111mm shifts blades into vane position at idle or off, reducing drag, improving reverse power, and allowing easy installation.
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$ 14,112.10
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1-2 weeks delivery time The Max-Prop Boomerang 120 / 4 Blade 22" Spinner 120mm moves into shaft position when torque stops, giving low drag, smooth operation, up to 80% more reverse power, and easy bolt-on mounting.
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$ 15,605.80
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1-2 weeks delivery time The Max-Prop Boomerang 120 / 4 Blade 23" Spinner 120mm automatically moves into shaft position when torque stops, reducing drag and improving sailing performance. Its radial spring system positions blades at idle or off, offering smooth operation, up to 80% more reverse thrust, low drag, easy bolt-on installation, and wide shaft compatibility.
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$ 15,605.80
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1-2 weeks delivery time The Max-Prop Boomerang 120 / 4 Blade 24" Spinner 120mm shifts blades into vane position automatically when no torque is applied, providing minimal drag and reliable performance. It features up to 80% more reverse power, smooth anti-shock operation, easy bolt-on installation, external pitch adjustment, and fits shafts ø35–100mm.
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$ 15,819.64
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1-2 weeks delivery time The Max-Prop Boomerang 120 / 4 Blade 25" Spinner 120mm moves into shaft position when torque stops, reducing drag and improving control for sailboats with hydraulic transmissions. Its patented spring system ensures blades are in vane position at idle or off, with high efficiency, smooth operation, up to 80% more reverse power, and simple bolt-on installation.
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$ 15,819.64
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1-2 weeks delivery time The Max-Prop Boomerang 120 / 4 Blade 26" Spinner 120mm automatically aligns into shaft position when torque is removed, minimizing drag and optimizing sailing performance. The integrated radial spring system positions blades at idle or off, offering smooth operation, up to 80% more reverse thrust, low drag, easy mounting, and wide shaft compatibility.
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$ 16,209.88
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1-2 weeks delivery time The Max-Prop Boomerang 120 / 4 Blade 27" Spinner 120mm moves blades into shaft position instantly when no torque is applied, ensuring very low drag and reliable performance. Its patented radial spring package positions blades at idle or off, providing up to 80% more reverse power, smooth anti-shock operation, easy bolt-on installation, and compatibility with shafts ø35–100mm.
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$ 16,209.88
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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) |
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| 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.