Whale Tail Sport 300 Hydrofoil Stabilizer for 40-350 HP Outboard Sterndrive 432 mm Nylon — Germany Local Warehouse
Whale Tail Sport 300 Hydrofoil Stabilizer for 40-350 HP Outboard Sterndrive 432 mm Nylon — Germany Local Warehouse
Product Overview
Universal whale tail hydrofoil stabilizer, part Sport 300, for outboards and sterndrives from 40 HP to 350 HP. The foil measures 432 mm across and 366 mm deep, is moulded in UV-resistant Nylon PA66 with SS316 stainless hardware, and weighs 1400 g packed at 440 x 380 x 70 mm. It bolts onto the antiventilation plate and adds a lifting surface behind the propeller, which is what gets a heavy boat onto the plane at lower rpm. Shipped from our Germany local warehouse.
The kit arrives complete: one hydrofoil, four SS316 bolts, nuts and gaskets, a drill guide and instructions. Nothing else has to be sourced before the boat goes on the trailer for the afternoon.
On the Baltic and the North Sea the useful gain is not top speed, it is the range between 12 and 22 knots where a deep-V hull otherwise wallows short of the plane. The foil gives the stern lift that the hull is missing at that speed, so the engine holds a lower rpm and burns less fuel for the same passage.
Specifications
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Hydrofoil stabilizer, whale tail |
| Part Number | Sport 300 |
| Engine | Outboard and sterndrive, 40 HP to 350 HP |
| Material | Nylon PA66, UV resistant |
| Hardware | SS316 stainless bolts, nuts and gaskets |
| Height | 366 mm (14.4 in) |
| Width | 432 mm (17 in) |
| Shipping Weight | 1400 g |
| Packaging Size | 440 x 380 x 70 mm (17.3 x 15.0 x 2.8 in) |
OEM Cross Reference
| Application | Part Number |
|---|---|
| Hydrofoil Stabilizer | Sport 300 |
| Universal fitment | Outboard and sterndrive antiventilation plate |
| Power range | 40 HP to 350 HP |
Compatible Engines
| Brand | Horsepower |
|---|---|
| Mercury | 40 HP to 350 HP |
| Mariner | 40 HP to 350 HP |
| Yamaha | 40 HP to 350 HP |
| Johnson / Evinrude | 40 HP to 350 HP |
| Honda | 40 HP to 350 HP |
| Tohatsu | 40 HP to 350 HP |
| Suzuki | 40 HP to 350 HP |
| Sterndrive | 40 HP to 350 HP |
What's Included
| Component | Qty |
|---|---|
| Hydrofoil Stabilizer | 1 |
| SS316 Bolt, Nut and Gasket Set | 4 |
| Install Tool Drill Guide | 1 |
| Instructions | 1 |
What the Foil Changes on the Water
| Behaviour | Before Fitting | After Fitting |
|---|---|---|
| Time to plane | Bow high, long run up to speed | Stern lifts earlier, shorter run |
| Planing speed | Falls off the plane in a chop | Holds the plane at lower rpm |
| Porpoising | Bow bounces in the 18 to 25 knot band | Foil damps the trim oscillation |
| Fuel at cruise | Higher rpm for the same speed | Lower rpm, less fuel per mile |
| Top speed | Baseline | Little or no change |
| Reverse and steering | Baseline | Slight change, the foil is behind the prop |
Fitting Notes
| Step | Action |
|---|---|
| 1 | Measure the antiventilation plate, the foil must sit flat without overhanging |
| 2 | Check the plate is at least as wide as the mounting base |
| 3 | Set the foil in place and mark the holes with the supplied guide |
| 4 | Drill through the plate, measure twice before the drill goes in |
| 5 | Seal the bolt holes with the gaskets and a marine sealant |
| 6 | Bolt up with the SS316 hardware and tighten evenly |
| 7 | Run the boat and trim one hole at a time until it stops porpoising |
| 8 | Check the bolts again after the first hour on the water |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Shipping from Germany
| Destination | Warehouse | Note |
|---|---|---|
| Germany | Germany local warehouse | Domestic delivery, no import duty |
| Austria, Netherlands, Belgium | Germany local warehouse | EU intra-community delivery |
| France, Italy, Spain, Poland | Germany local warehouse | EU intra-community delivery |
Before You Buy
- Measure the antiventilation plate first, the foil has to sit flat without overhanging the trailing edge
- Check that the plate is at least as wide as the foil mounting base
- Drill through the plate using the supplied guide, measure twice before drilling
- Seal the bolt holes with the supplied gaskets and a marine sealant
- The foil is not a substitute for the right propeller or engine height
- 30-Day Easy Returns
- Ships from our Germany local warehouse
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Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We operate a global warehouse network with a main distribution centre in Asia (10-20 business days). We also hold stock in regional warehouses across the United States, Germany, the United Kingdom, Australia, and Poland (opening soon) — most orders arrive in 1-3 business days within those countries and in 2-8 business days to nearby regions. Tracking included.
See our full Shipping Policy.
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