1. Propellers Boat Parts For Sale
  2. sku: 12446997796070871
  3. MERCURY MARINE 8906420

MERCURY MARINE 8906420 Boat Propeller Enertia Eco Rh Demo 20.5P

fits make: Mercury. year: 2016.

8906420 Mercury Marine Pn Boat Propeller Enertia Eco Rh 16 X 20.5p - Demo

( Brand: Mercury Marine ), ( Material: Stainless Steel ), ( Boat Brand: Supra Boats ), ( Country Of Origin: United States ), ( Type: Propeller ), ( Color: Silver ), ( Propeller Pitch: 20.5 ), ( Propeller Rotation: Standard )

Review MERCURY MARINE Pn Boat Propeller Enertia Eco Rh Demo fits 2016

The **Mercury Marine 8906420 Enertia Eco RH 16 20.5P Demo Propeller** is a premium, high-performance marine propeller designed to deliver exceptional efficiency, fuel savings, and reduced emissions while maintaining uncompromising power and handling. Engineered with Mercury Marine s cutting-edge **Enertia Eco** technology, this propeller features a **reverse hydrodynamic (RH) design**, which optimizes water flow to minimize drag and maximize thrust efficiency, particularly in cruising and low-speed operations. The **16-inch diameter** provides a balanced blend of acceleration and top-end speed, making it ideal for mid-sized boats ranging from 20 to 28 feet, such as sportfishing vessels, cruisers, and performance boats equipped with Mercury outboards rated between **150 and 250 horsepower**. The **20.5-pitch** ensures smooth, responsive acceleration while maintaining a strong towing capacity, reducing strain on the engine and improving overall fuel economy critical for both daily use and extended trips.

Crafted from **high-grade stainless steel**, this propeller is built to withstand the harshest marine environments, including saltwater corrosion, abrasive debris, and high-stress applications. The **demo unit** (new but previously displayed or tested) offers a cost-effective way to experience the benefits of Enertia Eco technology without the full retail price, making it an excellent choice for boat owners seeking reliability and performance. The **RH blade design** enhances maneuverability, reducing the effort required for tight turns and making docking and docking easier, while the **optimized blade contours** minimize cavitation and vibration, contributing to a quieter, smoother ride. Whether you're cruising along the coast, fishing in deep water, or towing a trailer, this propeller ensures a seamless balance of power, efficiency, and durability, embodying Mercury Marine s commitment to innovation and performance-driven engineering.

### **Pros and Cons of buying a Mercury Marine 8906420 Enertia Eco RH 16 20.5P Demo Propeller**

#### **Pros:**

1. **Eco-Friendly Design** The Enertia Eco series is engineered to reduce cavitation and improve fuel efficiency by minimizing water turbulence, which can lower operating costs over time.

2. **High Performance** The RH (right-hand) pitch and 16-inch diameter are optimized for mid-sized boats (likely in the 18 25-foot range), offering strong thrust and smooth operation for cruising and light planing.

3. **Durability** Mercury Marine propellers are known for their high-quality materials and precision manufacturing, which can extend the life of the propeller if properly maintained.

4. **Demo Condition** Purchasing a demo unit provides a cost savings compared to a new propeller, allowing you to test its performance before committing to a full-price replacement.

5. **Compatibility** The 20.5-inch pitch suggests it is well-suited for boats with moderate horsepower (likely 150 250 HP), making it a practical choice for many recreational and fishing applications.

6. **Potential for Resale Value** If the demo is in good condition, it may retain some value if you decide to upgrade later.

7. **Reduced Noise and Vibration** The Enertia design is intended to minimize vibration, which can improve comfort and reduce wear on the engine and drivetrain.

#### **Cons:**

1. **Wear and Potential Damage** Demo units may have minor or even noticeable wear, such as nicks, dents, or uneven blade surfaces, which could affect performance or longevity.

2. **Unknown Service History** Without a full history, you cannot be certain if the propeller has been properly maintained or if it has been exposed to harsh conditions (e.g., running aground, hitting debris).

3. **Possible Mismatch with Boat/Engine** If the demo propeller was previously used on a different boat with a different load or engine setup, it may not perform optimally on your specific vessel.

4. **Limited Warranty (If Any)** Demo items often come with reduced or no warranty coverage, leaving you responsible for any defects or failures post-purchase.

5. **Potential for Hidden Issues** Internal defects (e.g., cracks in the hub or blade roots) may not be visible during inspection, leading to premature failure.

6. **Resale Risk** If the propeller does not perform as expected, selling it later may be difficult, especially if it has visible wear.

7. **Installation Risks** If the propeller is not properly balanced or aligned, it could cause excessive vibration, damaging the engine or transmission over time.

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### **Conclusion**

Buying a demo Mercury Marine Enertia Eco RH 16 20.5P propeller can be a cost-effective way to upgrade your boat s propulsion system while benefiting from Mercury s reputation for quality. However, the risks of undetected wear, performance inconsistencies, and lack of warranty coverage must be carefully weighed against the savings. If you are confident in inspecting the propeller thoroughly (checking for cracks, balance, and blade condition) and are comfortable with the potential trade-offs, a demo unit can be a smart purchase. For those prioritizing reliability and warranty protection, a new propeller may be the safer long-term investment.

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### **Recommendation**

- **Proceed with Purchase If:**

- You have inspected the propeller carefully (look for cracks, uneven wear, and proper balance).

- You are confident in your ability to assess its condition and performance on your boat.

- You are willing to accept the risks of a demo unit for the cost savings.

- The price is significantly lower than a new propeller, and you can afford to replace it if issues arise.

- **Avoid or Consider Alternatives If:**

- You cannot thoroughly inspect the propeller or lack mechanical expertise.

- Your boat s engine or load conditions are significantly different from the original setup.

- You prefer the security of a warranty and want to avoid potential future repairs.

- A slightly used (but not demo) propeller from a trusted seller is available at a comparable price.

For maximum peace of mind, consider purchasing from a reputable dealer who offers a short-term warranty or return policy. If possible, test the propeller in the water before finalizing the purchase to ensure it meets your performance expectations.

Details:

Please review our images and carefully before purchasing. Across Back of Hub, There is oxidation and residue to this propeller as shown in photos. This propeller shows signs of previous use, oxidation and residue. Mercury Enertia Eco, Stainless Steel, 3 Blade, 16 x 20.5 Pitch, Right Hand, 5 DOA.

part #: 8906420 prices

  • $731.89-$2559.00

specifications propboapar:

  • for makes: Mercury
  • for years: 2016
  • brand: Mercury Marine
  • material: Stainless Steel
  • boat brand: Supra Boats
  • country of origin: United States
  • type: Propeller
  • color: Silver
  • propeller pitch: 20.5
  • propeller rotation: Standard

general propboapar:

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

payments propboapar:

  • wallet: Paypal
  • other
  • credit card: Mastercard

seller propboapar:

  • rating: 99.3%
  • city: Pleasant Prairie, Wisconsin
  • # reviews: 5041

offer propboapar:

  • sold: 0
  • started: April 22, 2026
  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock

returns propboapar:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

shipping propboapar:

  • transit: 2-5 Days
  • cost: $0.00
  • class: Standard, Expedited, One-day
  • carrier: FedEx
  • type: Calculated
  • service: FedEx Ground / FedEx Home Delivery, FedEx Express Saver, FedEx 2Day, FedEx Standard Overnight
for makes: mercury, for years: 2016, boat brand: supra boats, country of origin: united states, type: propeller, propeller pitch: 20.5, propeller rotation: standard,
category: boat parts > propellers, color: silver, material: stainless steel, sku: 12446997796070871,
Mercury Marine 20.5P Is Similar To:
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2 offers $731.89–$2559.00 USD
  • Used. Offer #1 priced at $731.89 + $0.00 shipping estimate = $731.89* total. There is oxidation and residue to this propeller as shown in photos This propeller shows signs of previous use, oxidation and residue.FREE SHIPPING
  • New. Offer #2 priced at $2559.00 + $59.40 shipping estimate = $2618.40* total. Flo-Torq II Hub Kit for Yamaha Part # 835274Q1. Part #8M0214720 & 8M0214721.+$59.40 shipping

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