300 Whale Tail Hydrofoil Stabilizer – Fits Outboards & Stern Drives 40-350 HP (Replaces SE Sport 300 , SeaSierra 300HS)
300 Whale Tail Hydrofoil Stabilizer – Fits Outboards & Stern Drives 40-350 HP (Replaces SE Sport 300 , SeaSierra 300HS) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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300 Whale Tail Hydrofoil Stabilizer – Fits Outboards & Stern Dr...
300 Whale Tail Hydrofoil Stabilizer – Fits Outboards & Stern Drives 40-350 HP (Replaces SE Sport 300 , SeaSierra 300HS) is backordered and will ship as soon as it is back in stock.
Product Details
This 300 Whale Tail Hydrofoil Stabilizer is a universal marine hydrofoil designed to dramatically improve your boat's performance, handling, and fuel efficiency. It mounts directly to the cavitation plate of most outboard motors and stern drives in the 40-350 HP range, helping to reduce bow rise, eliminate porpoising and cavitation, and get your boat on plane faster.
This part is a direct replacement for several models, including SE Sport 300, SeaSierra 300HS, PLSDDS 300, QuickMarine HS003, and NorthBoat FO2003.
- Installs directly onto the anti-ventilation (cavitation) plate.
- Constructed from high-strength, marine-grade UV-resistant nylon for durability.
- Includes all necessary stainless steel mounting hardware for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| SE Sport | 300 |
| SeaSierra | 300HS |
| PLSDDS | 300 |
| QuickMarine | HS003 |
| NorthBoat | FO2003 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Models | Rated HP | Stroke | Years | Notes |
|---|---|---|---|---|---|
| Yamaha | Most Models | 40-350 HP | 2 & 4-Stroke | All | Except specific incompatibilities noted below |
| Mercury | Most Models | 40-350 HP | 2 & 4-Stroke | All | Exception: Mercury 40 HP 4-Stroke incompatible |
| Johnson/Evinrude | Most Models | 40-350 HP | 2 & 4-Stroke | All | |
| Suzuki | Most Models | 40-350 HP | 2 & 4-Stroke | All | |
| Honda | Most Models | 40-350 HP | 2 & 4-Stroke | All | |
| Tohatsu | Most Models | 40-350 HP | 2 & 4-Stroke | All | |
| MerCruiser | Most Sterndrives | 40-350 HP | 4-Stroke | All | |
| Volvo Penta | Most Sterndrives | 40-350 HP | 4-Stroke | All |
Technical Specs
- Product Type
- Marine Hydrofoil Stabilizer
- Installation
- Cavitation plate mount (anti-ventilation plate)
- Material
- Marine Grade UV-Resistant Reinforced Nylon PA66 Plastic
- Color
- Black/Silver (varies by brand)
- Dimensions
- 17.0-17.5" × 14.4-15.5" × 3.5" (432-445mm × 366-394mm × 89mm)
- Weight
- 1.38-1.79 kg (3.04-3.84 lbs)
- Compatible Engine HP Range
- 40-350 HP
- Compatible Engine Types
- 2-Stroke & 4-Stroke outboards, stern drives
- Warranty
- 1 Year (varies by brand)
- Installation Hardware
- Included (screws, nuts, drill bit)
What’s in the Box
- 1 x Hydrofoil Stabilizer
- 4 x Mounting Screws
- 4 x Mounting Nuts
- 1 x Drill Bit
- 1 x Installation Instructions
Installation Notes
Installation of this universal hydrofoil requires drilling into the engine's anti-ventilation plate. All necessary mounting hardware and a correctly sized drill bit are included. Always follow the detailed installation instructions provided with your specific product for a secure and safe fit. Be aware that this hydrofoil is not compatible with Mercury 40 HP 4-Stroke engines and may interfere with some shallow water drive systems.
Troubleshooting & FAQ
How does this hydrofoil improve my boat's performance?
By providing hydrodynamic lift at the stern, the hydrofoil helps the boat plane faster and at lower speeds. This reduces bow rise during acceleration, enhances stability in various water conditions, provides a smoother ride, and reduces issues like porpoising (bow bouncing) and cavitation (propeller ventilation).
Will this hydrofoil fit my specific engine?
This is a universal stabilizer designed for most outboard and stern drive engines from 40 to 350 HP. Please review the compatibility table. The key exception is the Mercury 40 HP 4-Stroke engine, which is not compatible. Always verify your engine falls within the supported range before purchasing.
Is drilling required for installation?
Yes, installation requires drilling four holes in the cavitation (anti-ventilation) plate of your lower unit. The kit includes the necessary drill bit, screws, and nuts to complete the process.
What causes porpoising and will this fix it?
Porpoising is the rhythmic bouncing of the boat's bow, often caused by improper weight distribution or trim settings. This hydrofoil helps mitigate porpoising by adding stern lift and improving stability, leading to a smoother and more controlled ride.
What are signs my old hydrofoil needs replacement?
Inspect your hydrofoil for visible cracks, stress marks, or any pieces that have broken off. Damage can reduce effectiveness and potentially create a safety hazard. If you notice a sudden decline in performance benefits, it may be time for a replacement.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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