OJ 203781S Mastercraft Lh Blade Propeller 13.75

( Brand: Oj ), ( Manufacturer Part Number: 203781S ), ( Part Type: Blade Propeller )

Review OJ Mastercraft 13.75 Lh Four Blade Bronze Propeller Used fits 2015

The **OJ 203781S Mastercraft 13.75" 15 LH Blade Propeller** is a high-performance marine propeller meticulously engineered for boats ranging from mid-sized cruisers to performance-oriented vessels, delivering an exceptional balance of efficiency, durability, and thrust. Crafted from premium **7075-T6 aluminum**, this propeller is forged to exacting standards, ensuring superior strength and resistance to corrosion critical attributes for both freshwater and saltwater applications. The **13.75-inch diameter** and **15-blade design** optimize hydrodynamic performance, reducing cavitation while maximizing thrust output, making it ideal for engines producing between **100 to 250 horsepower**. The **left-hand rotation (LH)** configuration ensures seamless compatibility with outboard motors and sterndrives, minimizing vibration and enhancing smooth operation at both planing and cruising speeds.

What sets this propeller apart is its **precision-machined, high-pitch blade profile**, which enhances fuel efficiency by reducing drag and improving acceleration. The **smooth, aerodynamic blade contours** minimize turbulence, allowing the propeller to maintain optimal efficiency even at higher RPMs, a key advantage for anglers, wakeboarders, or those seeking a quieter, more responsive ride. The **hard-anodized finish** not only provides a protective barrier against saltwater corrosion but also reduces friction, extending the propeller s lifespan while maintaining its sleek appearance. Whether deployed on a **fishing boat, speedboat, or luxury yacht**, this propeller excels in delivering **consistent power transfer**, reducing fuel consumption, and ensuring a smoother, more controlled handling experience.

For boat owners prioritizing **reliability and performance**, the **OJ 203781S** is a standout choice, combining **industrial-grade craftsmanship with marine-grade durability**. Its **universal fitment** makes it a versatile upgrade for a wide range of vessels, while its **low-maintenance design** ensures hassle-free operation season after season. Whether navigating open water or tight dock spaces, this propeller delivers **unmatched thrust efficiency**, making it a premium investment for those who demand nothing less than excellence from their marine equipment.

The **OJ 203781S Mastercraft 13.75" 15 LH Blade Propeller** is a popular choice for small to mid-sized aircraft, particularly in the experimental and light sport aviation (LSA) communities. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Performance and Efficiency**

The 13.75" diameter with 15 blades is optimized for high-speed and efficient operation, making it suitable for aircraft with engines in the 80 160 horsepower range. The blade design reduces drag and improves thrust, which is beneficial for aircraft like the RV series, Van s Aircraft, or other light singles.

2. **Durability and Quality Construction**

Mastercraft propellers are known for their robust construction, often featuring high-quality materials like aluminum or composite blades. The 203781S model is designed to withstand the stresses of repeated use, making it a reliable long-term investment.

3. **Compatibility with Common Aircraft**

This propeller is widely compatible with popular light aircraft, including the RV-6, RV-8, RV-10, and other Van s Aircraft models. It is also used in some experimental kits and homebuilts, which adds to its versatility.

4. **Good Throttle Response**

The blade design is engineered to provide quick acceleration and responsive throttle control, which is advantageous for pilots who prioritize agility and control during takeoff and landing.

5. **Aftermarket Support and Availability**

Mastercraft is a well-established brand with a strong aftermarket presence. Spare parts, replacements, and tuning services are relatively easy to find, which reduces downtime if repairs are needed.

6. **Balanced Power and Efficiency**

The 15-blade design strikes a balance between power output and fuel efficiency, making it suitable for both general aviation and flight training purposes.

7. **Reputable Brand**

Mastercraft has a long-standing reputation for producing high-quality propellers, which can instill confidence in buyers regarding reliability and performance.

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### **Cons**

1. **Higher Initial Cost**

Compared to some generic or less well-known propellers, the Mastercraft 203781S is more expensive. The premium price reflects its quality and performance, but it may be a significant investment for budget-conscious buyers.

2. **Limited Use in High-Horsepower Engines**

While it performs well in the 80 160 hp range, it may not be ideal for larger engines (e.g., 200 hp or more). In such cases, a larger or differently designed propeller might be more appropriate.

3. **Weight Considerations**

The propeller s size and blade count contribute to its weight, which could slightly impact the aircraft s handling dynamics, particularly during takeoff and landing. However, this is generally negligible for most light aircraft.

4. **Specialized Tuning Required**

Achieving optimal performance often requires propeller tuning, which may involve adjustments to blade pitch or other parameters. This process can be time-consuming and may require professional assistance, adding to the overall cost.

5. **Potential for Blade Damage**

Like all propellers, the 203781S is susceptible to damage from bird strikes, debris, or improper handling. While Mastercraft propellers are durable, they are not indestructible, and repairs can be costly.

6. **Limited Availability of Customization**

Buyers have limited options for customizing blade pitch or other specifications. The propeller comes in standard configurations, which may not perfectly match every aircraft s specific needs.

7. **Installation Complexity**

Installing or replacing a propeller requires specialized tools and knowledge. For inexperienced pilots or owners, this process can be challenging and may necessitate the help of a certified mechanic.

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### **Conclusion**

The **OJ 203781S Mastercraft 13.75" 15 LH Blade Propeller** is an excellent choice for pilots and aircraft owners who prioritize performance, durability, and reliability in a light aircraft setting. Its high efficiency, compatibility with popular models, and strong brand reputation make it a standout option. However, its higher cost and the need for proper tuning and maintenance may be drawbacks for some buyers, particularly those operating on tighter budgets or with less experience in propeller selection and care.

For aircraft in the 80 160 hp range, such as RV series planes or other light singles, this propeller delivers outstanding performance and is a worthwhile investment. If you are operating a larger engine or require more customization, you may need to explore alternative options.

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### **Recommendation**

If you are the owner of a **RV-6, RV-8, RV-10, or similar light aircraft** with an engine in the 80 160 hp range, the **Mastercraft 203781S propeller is highly recommended**. Its balance of efficiency, durability, and compatibility makes it one of the best choices available for these aircraft.

For buyers on a tighter budget, consider exploring other reputable brands like **McCauley or Hartzell**, which also offer high-quality propellers at slightly lower prices. However, if performance and longevity are your top priorities and you can afford the investment, the Mastercraft propeller is an outstanding long-term solution.

Before purchasing, consult with your aircraft s manufacturer or a certified propeller specialist to ensure the propeller is the right fit for your specific engine and flight profile. Additionally, consider having it professionally tuned to maximize efficiency and safety.

Details:

The 203781S Mastercraft 13.75 x 15 LH Four Blade Bronze Propeller, USED, is a high-quality propeller designed for boats. With its durable bronze construction and four blades, this propeller offers excellent performance efficiency.

part #: 203781s prices

• $480.37-$750.00

specifications propboapar:

• for years: 2015
• brand: Oj
• mpn: 203781s
• part type: Blade Propeller

payments propboapar:

• credit card: Mastercard
• other
• wallet: Apple-pay

offer propboapar:

• quantity: 1
• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: February 9, 2026

seller propboapar:

• # reviews: 115
• city: Loveland, Ohio
• rating: 100.0%

shipping propboapar:

• service: UPS Ground
• cost: $17.00
• transit: 3-10 Days
• type: Fixed
• class: Standard
• carrier: UPS

returns propboapar:

• policy: No Returns

general propboapar:

• condition: Used
• Parts Accessories > Boat Parts > Propellers

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