Description
15 3/4x21 S3r Prop Sema | Boat Supply Store
This Polaris S3r Sema propeller, measuring 15 3/4 inches in diameter and featuring a 21-inch pitch, delivers robust thrust for efficient acceleration and cruising speeds. Its advanced blade geometry is designed to minimize cavitation and maximize hydrodynamic efficiency across a range of RPMs. Ideal for repowering or upgrading a moderate-sized V-hull or pontoon boat operating in coastal Texas bays where maintaining plane is critical.
Key Features
- Optimized blade pitch for enhanced acceleration
- Durable aluminum alloy construction for longevity
- Sema series for improved hydrodynamic efficiency
- 15 3/4" diameter for substantial water displacement
- 21" pitch for effective cruising speeds
- Corrosion-resistant finish for marine environments
- Engineered for reduced vibration and noise
- Direct fit replacement for specified outboard engines
Specifications
| Product Specifications | |
|---|---|
| Diameter | 15 3/4 inches |
| Pitch | 21 inches |
| Material | Aluminum Alloy |
| Series | S3r Sema |
| Brand | POLARIS PROPELLER USA, INC. |
Who This Is For
Boaters seeking to optimize the performance of their outboard engines, particularly those operating moderate-sized vessels in demanding marine conditions. This propeller is suitable for those who prioritize efficient planing and cruising speeds.
How It Compares
| Feature | 15 3/4x21 S3r Prop Sema | Quicksilver |
|---|---|---|
| Diameter | 15 3/4 inches | — |
| Pitch | 21 inches | — |
| Material | Aluminum Alloy | Aluminum Alloy |
| Series | S3r Sema | Black Diamond |
Common Concerns Answered
Will this propeller fit my specific outboard motor?
This propeller is designed for a specific fitment range. Please verify compatibility with your outboard motor's horsepower and drive system against the fitment data or consult a specialist to ensure correct application.
How durable is the aluminum construction in saltwater?
The aluminum alloy used in this propeller is treated with a corrosion-resistant coating specifically engineered to withstand the harsh conditions of saltwater environments, ensuring extended service life.
What is the expected performance difference compared to my current propeller?
The S3r Sema series, with its 15 3/4" x 21" specifications, is engineered for improved acceleration and cruising efficiency, potentially offering better hole shot performance and a higher top-end speed depending on your vessel's hull and current engine output.
Frequently Asked Questions
What does 'S3r Sema' signify in this propeller model?
'S3r Sema' denotes a specific series from Polaris Propeller USA, Inc. engineered for enhanced hydrodynamic performance, often featuring advanced blade designs to reduce drag and improve efficiency.
How does a 21-inch pitch impact boat performance?
A 21-inch pitch propeller provides a greater distance traveled through the water per revolution, generally contributing to higher top-end speeds and more efficient cruising at lower RPMs on suitable vessels.
Is propeller installation a complex process?
Installation difficulty is rated as 1, indicating a relatively straightforward process. Basic mechanical aptitude and appropriate tools are typically required for a secure and correct installation.
What is the benefit of a 15 3/4 inch diameter propeller?
A 15 3/4 inch diameter allows the propeller to engage a larger volume of water, which can translate to increased thrust, improved acceleration, and better ability to hold plane, especially on heavier or larger displacement hulls.
Can this propeller be used for watersports like wakeboarding or tubing?
While this propeller is designed for general cruising and efficiency, its pitch and diameter can offer good performance for watersports requiring strong acceleration to get up on plane, assuming it matches the engine's power band and vessel weight.
