Sport-300 Whale Tail Hydrofoil Stabilizer for Outboard Motors and Stern Drives, 40–350 HP
Sport-300 Whale Tail Hydrofoil Stabilizer for Outboard Motors and Stern Drives, 40–350 HP is backordered and will ship as soon as it is back in stock.
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Sport-300 Whale Tail Hydrofoil Stabilizer for Outboard Motors and S...
Sport-300 Whale Tail Hydrofoil Stabilizer for Outboard Motors and Stern Drives, 40–350 HP is backordered and will ship as soon as it is back in stock.
Product Details
The Sport-300 Whale Tail Hydrofoil Stabilizer is an aftermarket marine performance accessory designed for many outboard motors and stern drives in the 40–350 HP range. It mounts to the anti-ventilation plate and is intended to improve low-speed handling, help the boat reach planing speed, and promote greater stability while underway.
This hydrofoil is commonly marketed as an aftermarket alternative to the SE Sport 300, HD300, and FO2003-style whale-tail hydrofoils. Confirm the dimensions, mounting surface, and clearance around your specific installation before drilling.
- Direct bolt-on installation through the anti-ventilation plate; drilling is required.
- Made from UV-resistant, impact-resistant Nylon-PA66 for marine use.
- Includes stainless steel mounting hardware and a 6.5 mm drill bit.
Part Number Matrix
The following references are aftermarket comparison and interchange leads. Verify the physical dimensions and mounting pattern before installation.
| Brand or Source | Part Number |
|---|---|
| SE Sport | 300 |
| HD | HD300 |
| Aftermarket | FO2003 |
Engine and Model Compatibility
This is a broad application guide rather than a model-by-model fitment guarantee. Confirm the engine or drive model, available clearance, and anti-ventilation-plate dimensions before purchase and installation.
Outboard Motors
| Brand | Rated HP | Stroke | Notes |
|---|---|---|---|
| Mercury/Mariner | 40–350 HP | 2- and 4-Stroke | Not compatible with Mercury 40 HP 4-Stroke applications listed for this product. |
| Yamaha | 40–350 HP | 2- and 4-Stroke | Verify plate dimensions and clearance. |
| Johnson/Evinrude | 40–350 HP | 2- and 4-Stroke | Verify plate dimensions and clearance. |
| Honda | 40–350 HP | 2- and 4-Stroke | Verify plate dimensions and clearance. |
| Suzuki | 40–350 HP | 2- and 4-Stroke | Verify plate dimensions and clearance. |
| Tohatsu | 40–350 HP | 2- and 4-Stroke | Verify plate dimensions and clearance. |
Stern Drives
| Brand | Model | Rated HP | Notes |
|---|---|---|---|
| MerCruiser | Various | 40–350 HP | Verify the drive housing and mounting clearance. |
| OMC | Various | 40–350 HP | Verify the drive housing and mounting clearance. |
| Volvo Penta | SX-A, DPS, DPR, DPH, 280, and 290 series | 40–350 HP | Longer bolts and 1-inch fender washers may be required. |
| Volvo Penta | Ocean Series XDP | Any | Not compatible. |
Technical Specifications
- Product Type
- Outboard motor and stern-drive hydrofoil stabilizer
- Installation
- Mounts to the anti-ventilation plate with mounting hardware
- Connection
- Bolt-on; drilling required
- Material
- Nylon-PA66
- Color
- Black
- Dimensions
- Approximately 17 inches (43.18 cm) high × 14.4 inches (36.58 cm) wide
- Fitting Type
- Bolted attachment
- Other Attributes
- UV-resistant construction with impact resistance
What's in the Box
- 1 × Outboard hydrofoil stabilizer
- 4 × Sets of stainless steel screws and nuts
- 1 × 6.5 mm drill bit
- 1 × Installation instruction
Installation Notes
- Turn off the engine, remove the key, and follow the boat manufacturer's safety procedures. Disconnect the battery if appropriate for your boat.
- Center the hydrofoil on the anti-ventilation plate, the flat plate above the propeller.
- Mark the four mounting-hole locations through the hydrofoil.
- Carefully drill the marked holes with the supplied 6.5 mm drill bit.
- Attach the hydrofoil using the supplied stainless steel screws and nuts.
- Tighten the fasteners evenly without overtightening or deforming the plate.
- After installation, perform a low-speed water test and check handling, clearance, and fastener security before normal operation.
Troubleshooting and FAQ
Will this hydrofoil fit my specific engine model?
It is intended for many outboard motors and stern drives rated from 40 to 350 HP, but the range is not a guarantee for every model. Check the compatibility tables, compare the anti-ventilation-plate dimensions, and verify clearance before drilling. It is not compatible with the Mercury 40 HP 4-Stroke application identified above.
Is drilling into the anti-ventilation or cavitation plate required?
Yes. This is a bolt-on design that requires four holes to be drilled into the anti-ventilation plate for installation.
What are the expected performance benefits?
A properly installed hydrofoil may help the boat get on plane sooner and may improve low-speed stability, handling, and running attitude. Results vary with hull design, engine setup, load, trim, and water conditions. No specific fuel-economy improvement is guaranteed.
How does this compare with the SE Sport 300?
This is an aftermarket hydrofoil presented as an alternative to the SE Sport 300-style design. Confirm the mounting dimensions and installation requirements rather than relying on the comparison name alone.
What tools are needed for installation?
You will need a power drill, a wrench or socket set, suitable safety equipment, and the supplied 6.5 mm drill bit. Confirm that the supplied fasteners are appropriate for your particular installation before drilling.
My Volvo Penta drive needs longer bolts. Are they included?
Some Volvo Penta applications, including certain SX-A, DPS, and DPH installations, may require longer bolts and compatible 1-inch fender washers. These additional items are not listed as included and may need to be sourced separately.
Is this an OEM component?
No. This is an aftermarket replacement or performance accessory and is not represented as an OEM component.
What should I check before installation?
Check the model and horsepower range, anti-ventilation-plate size, mounting clearance, propeller and drive clearance, and all supplied hardware. Do not drill until the hydrofoil is correctly positioned and confirmed suitable for your application.
Safety and Important Information
- Verify the product dimensions, mounting position, and clearance against your engine or stern drive before drilling.
- Do not install on an application listed as incompatible.
- Follow the boat and engine manufacturer's safety instructions and use appropriate protective equipment.
- Professional installation is recommended when you are unsure about drilling or mounting on the anti-ventilation plate.
- Inspect the fasteners and hydrofoil after the initial water test and periodically during use.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts selected for practical installation and real-world use.
- Fast Global Fulfillment — Shipping options and delivery times are shown at checkout where available.
- Manufacturer-Direct Value — We aim to provide practical aftermarket solutions at competitive value.
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