Rubex HR4 (13 x 21″) Solas LH Propeller, 9454-130-21
Introduction
The Rubex HR4 (13 x 21″) Solas LH Propeller, 9454-130-21 stands at the forefront of marine propulsion performance, delivering unmatched torque, grip, and efficiency for outboard marine engines. Designed for boaters who demand speed without compromising on control, this stainless steel 4-blade left-hand (LH) propeller ensures precision handling and fuel economy in all marine conditions. Manufactured by Solas, a globally trusted name in marine engineering, the HR4 13×21 LH model is optimized for applications where superior thrust, smoother acceleration, and robust durability are critical.
This blog provides a complete review of the Rubex HR4 9454-130-21 propeller — covering everything from installation tips and performance benefits to expert insights, maintenance advice, and frequently asked questions. If you’re considering upgrading your current propeller or building a high-performance twin-engine system, this guide is for you.
Overview / What Is the Rubex HR4 (13 x 21″) Solas LH Propeller?
The Rubex HR4 13 x 21” Solas LH Propeller is a high-rake, high-cupped 4-blade stainless steel prop designed to offer increased bite and performance for mid-to-large outboard engines. With a diameter of 13 inches and a pitch of 21 inches, it strikes an excellent balance between acceleration and top speed — ideal for heavier boats and high-speed cruising. The left-hand rotation configuration makes it ideal for dual-engine installations where torque balance is essential.
This model belongs to the Rubex 4 Series from Solas and features their unique interchangeable Rubex hub system. The hub is sold separately, allowing easy installation, reduced vibration, and built-in protection for your engine shaft in the event of sudden impact. This system saves cost over time and provides a smoother boating experience.
Key Specifications and Benefits
- Brand: Solas
- Model: Rubex HR4 (13 x 21″) LH
- Part Number: 9454-130-21
- Material: High-quality stainless steel
- Blades: 4-blade design
- Rotation: Left-hand (counterclockwise)
- Diameter: 13 inches
- Pitch: 21 inches
- Hub System: Interchangeable Rubex hub (sold separately)
These specifications make the HR4 13×21 propeller a preferred option for performance boaters looking to enhance control, hole shot, and fuel economy while maintaining durability across seasons.
Top Applications and Engine Compatibility
The Rubex HR4 9454-130-21 is compatible with many major outboard engine brands, including Yamaha, Mercury, Honda, Evinrude, and Suzuki — provided the correct Rubex hub kit is used. It’s perfect for boats such as:
- Performance fishing boats
- Dual-console cruisers
- Center-console offshore boats
- Pontoons and tritoons needing LH rotation
Many dual-motor setups use this propeller as part of a counter-rotating pair, ensuring better steering control and reduced prop walk.
How to Install Rubex HR4 (13 x 21″) LH Propeller
Installing this propeller is straightforward, thanks to the interchangeable hub design. Here are step-by-step instructions:
- Remove the existing propeller from your engine shaft using a wrench and pliers to extract the cotter pin.
- Insert the appropriate Rubex hub into your new HR4 13×21 propeller.
- Place the propeller onto the drive shaft along with thrust washers and spacers as per manufacturer recommendations.
- Tighten the nut securely and reinsert a new cotter pin to lock the setup.
Pro Tip: Apply marine grease on the shaft before installation to avoid corrosion and ensure easy removal later.
Maintenance Tips
To preserve the integrity and efficiency of your Rubex HR4 (13 x 21″) Solas LH Propeller, consistent maintenance is essential. Follow these guidelines:
- Inspect before every trip: Look for signs of blade damage, fishing line entanglement, or corrosion.
- Freshwater rinse: After saltwater use, thoroughly rinse the propeller and lower unit with clean freshwater.
- Remove periodically: Every 20-30 hours of operation, remove the propeller and check the hub and shaft for signs of wear.
- Apply marine grease: Regular greasing of the prop shaft helps prevent bonding and rusting over time.
Warning: Avoid using abrasive cleaners or tools on the stainless steel finish to maintain its integrity and reduce corrosion risk.
Performance Review: Speed, Control, and Thrust
The Rubex HR4 9454-130-21 delivers a remarkable mix of speed, acceleration, and low-speed control. Thanks to its 4-blade geometry and extended cupping, the propeller provides maximum surface area contact with the water, reducing slip and improving thrust.
Tested on mid-sized fishing boats and cruisers, this model showed faster planing times, increased fuel economy at cruising RPMs, and significantly smoother turns at low speeds. It’s particularly effective in choppy water conditions where additional blade area ensures a steadier ride.
Rubex HR4 13×21 vs Traditional 3-Blade Propellers
Many boaters ask whether it’s worth switching from a 3-blade to a 4-blade propeller. Here’s a comparison:
- Acceleration: HR4 provides faster hole shots and reduced ventilation.
- Handling: Better turning and tracking, especially under load.
- Fuel Efficiency: Slightly improved at midrange RPMs.
- Top Speed: May be slightly lower than 3-blade, but gains in control often outweigh this.
Ultimately, the HR4 offers a better all-around performance for versatile boating needs — especially when control, fuel economy, and load handling are priorities.
Expert Advice and Pro Recommendations
If you’re looking to upgrade or fine-tune your boat’s performance, experts highly recommend the Rubex HR4 (13 x 21″) LH propeller. It delivers reliability and torque where it matters most — under load, during tight maneuvers, and in rougher marine conditions. The prop is especially beneficial for dual-prop setups needing counter-rotation, or heavier vessels with fuel-sensitive engines.
Marine professionals suggest always pairing your prop with a new hub kit, and conducting a test drive under expected load conditions to fine-tune pitch and RPM. When paired correctly, this propeller outperforms many competitors in the same category.
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Detailed FAQ Section
Which boats are best suited for the Rubex HR4 13 x 21 LH propeller?
The Rubex HR4 13×21 LH propeller is well-suited for heavier boats, twin-engine setups, and performance-oriented fishing vessels. Boats that carry significant gear or require extra grip at lower speeds benefit most from its 4-blade configuration. Examples include offshore center consoles, pontoon boats with LH drive, or bay boats that experience choppy waters. Its design helps with planing and midrange efficiency, giving boaters more control even at high RPMs or under variable load.
How do I install the Rubex HR4 propeller using the Rubex hub system?
Installation is simple using the Rubex interchangeable hub system. Insert the rubber hub into the propeller and place it on your engine’s shaft. Add the thrust washer, spacer, and nut per your engine model’s instructions. Tighten securely and install the cotter pin. Always apply marine grease to prevent corrosion. The hub absorbs shock, making it an essential safety component — especially when navigating areas with hidden debris or rocky bottoms.
What kind of performance can I expect from a 13 x 21 LH 4-blade prop?
You can expect a strong hole shot, minimal cavitation, smoother cornering, and improved fuel economy at cruise RPMs. This specific pitch (21″) allows higher speed potential without sacrificing low-end torque. When installed correctly, it reduces engine strain and increases ride comfort. You’ll notice less vibration, particularly under heavier loads or when towing, making it ideal for both leisure and utility boating.
What maintenance is needed for this stainless steel propeller?
Stainless steel is corrosion-resistant but not maintenance-free. Rinse the prop after every use (especially in saltwater), inspect for damage weekly, remove and grease the shaft regularly, and inspect the hub for wear. Replacing the cotter pin during each removal is recommended. Keep a backup hub kit onboard to prevent delays if damage occurs during your trip.
Is it worth upgrading from a 3-blade to a 4-blade HR4 propeller?
Yes — particularly if you’re seeking enhanced control, better acceleration, and fuel savings at cruising speed. The 4-blade HR4 prop offers better tracking and stability in rough waters and is ideal for load-heavy boats. While top-end speed may drop by 1–2 knots compared to a 3-blade, most boaters find the trade-off worthwhile due to overall performance gains. Plus, its stainless steel construction adds durability and longevity, reducing the total cost of ownership.
Conclusion
The Rubex HR4 (13 x 21″) Solas LH Propeller, 9454-130-21 is an ideal choice for boaters seeking durability, performance, and control in one package. Whether you’re navigating inland lakes or offshore waters, its advanced 4-blade design ensures optimal thrust, smoother handling, and better fuel efficiency. The Rubex hub system adds safety and ease of maintenance, making it a smart investment for long-term marine use. From amateur weekend cruisers to pro-level anglers, this prop delivers consistent results you can count on.
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